diff --git a/rxjava-core/src/main/java/rx/Observable.java b/rxjava-core/src/main/java/rx/Observable.java
index ce2b883764..18df894295 100644
--- a/rxjava-core/src/main/java/rx/Observable.java
+++ b/rxjava-core/src/main/java/rx/Observable.java
@@ -83,6 +83,7 @@
 import rx.operators.OperationTimeInterval;
 import rx.operators.OperationTimeout;
 import rx.operators.OperationTimestamp;
+import rx.operators.OperationToAsync;
 import rx.operators.OperationToObservableFuture;
 import rx.operators.OperationToObservableIterable;
 import rx.operators.OperationToObservableList;
@@ -108,6 +109,15 @@
 import rx.util.Timestamped;
 import rx.util.functions.Action0;
 import rx.util.functions.Action1;
+import rx.util.functions.Action2;
+import rx.util.functions.Action3;
+import rx.util.functions.Action4;
+import rx.util.functions.Action5;
+import rx.util.functions.Action6;
+import rx.util.functions.Action7;
+import rx.util.functions.Action8;
+import rx.util.functions.Action9;
+import rx.util.functions.ActionN;
 import rx.util.functions.Func0;
 import rx.util.functions.Func1;
 import rx.util.functions.Func2;
@@ -4606,7 +4616,641 @@ public Observable<List<T>> toSortedList() {
     public Observable<List<T>> toSortedList(Func2<? super T, ? super T, Integer> sortFunction) {
         return create(OperationToObservableSortedList.toSortedList(this, sortFunction));
     }
-
+    
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229868(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static Func0<Observable<Void>> toAsync(Action0 action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229182(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <R> Func0<Observable<R>> toAsync(Func0<R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229657(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1> Func1<T1, Observable<Void>> toAsync(Action1<T1> action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229755(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, R> Func1<T1, Observable<R>> toAsync(Func1<T1, R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh211875(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2> Func2<T1, T2, Observable<Void>> toAsync(Action2<T1, T2> action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229851(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, R> Func2<T1, T2, Observable<R>> toAsync(Func2<T1, T2, R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229336(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3> Func3<T1, T2, T3, Observable<Void>> toAsync(Action3<T1, T2, T3> action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229450(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, R> Func3<T1, T2, T3, Observable<R>> toAsync(Func3<T1, T2, T3, R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229769(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4> Func4<T1, T2, T3, T4, Observable<Void>> toAsync(Action4<T1, T2, T3, T4> action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229911(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, R> Func4<T1, T2, T3, T4, Observable<R>> toAsync(Func4<T1, T2, T3, T4, R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229577(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5> Func5<T1, T2, T3, T4, T5, Observable<Void>> toAsync(Action5<T1, T2, T3, T4, T5> action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229571(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, R> Func5<T1, T2, T3, T4, T5, Observable<R>> toAsync(Func5<T1, T2, T3, T4, T5, R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh211773(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6> Func6<T1, T2, T3, T4, T5, T6, Observable<Void>> toAsync(Action6<T1, T2, T3, T4, T5, T6> action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229716(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, R> Func6<T1, T2, T3, T4, T5, T6, Observable<R>> toAsync(Func6<T1, T2, T3, T4, T5, T6, R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh211812(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7> Func7<T1, T2, T3, T4, T5, T6, T7, Observable<Void>> toAsync(Action7<T1, T2, T3, T4, T5, T6, T7> action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229773(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, R> Func7<T1, T2, T3, T4, T5, T6, T7, Observable<R>> toAsync(Func7<T1, T2, T3, T4, T5, T6, T7, R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh228993(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8> Func8<T1, T2, T3, T4, T5, T6, T7, T8, Observable<Void>> toAsync(Action8<T1, T2, T3, T4, T5, T6, T7, T8> action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229910(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Func8<T1, T2, T3, T4, T5, T6, T7, T8, Observable<R>> toAsync(Func8<T1, T2, T3, T4, T5, T6, T7, T8, R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh211702(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, T9> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, Observable<Void>> toAsync(Action9<T1, T2, T3, T4, T5, T6, T7, T8, T9> action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh212074(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, Observable<R>> toAsync(Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     */
+    public static FuncN<Observable<Void>> toAsync(ActionN action) {
+        return OperationToAsync.toAsync(action, Schedulers.threadPoolForAsyncConversions());
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     */
+    public static <R> FuncN<Observable<R>> toAsync(FuncN<R> func) {
+        return OperationToAsync.toAsync(func, Schedulers.threadPoolForAsyncConversions());
+    }
+	    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229439(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static Func0<Observable<Void>> toAsync(Action0 action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh211792(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <R> Func0<Observable<R>> toAsync(Func0<R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229822(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1> Func1<T1, Observable<Void>> toAsync(Action1<T1> action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229731(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, R> Func1<T1, Observable<R>> toAsync(Func1<T1, R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229722(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2> Func2<T1, T2, Observable<Void>> toAsync(Action2<T1, T2> action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229327(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, R> Func2<T1, T2, Observable<R>> toAsync(Func2<T1, T2, R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh211787(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3> Func3<T1, T2, T3, Observable<Void>> toAsync(Action3<T1, T2, T3> action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229287(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, R> Func3<T1, T2, T3, Observable<R>> toAsync(Func3<T1, T2, T3, R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229370(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4> Func4<T1, T2, T3, T4, Observable<Void>> toAsync(Action4<T1, T2, T3, T4> action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229560(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, R> Func4<T1, T2, T3, T4, Observable<R>> toAsync(Func4<T1, T2, T3, T4, R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh212149(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5> Func5<T1, T2, T3, T4, T5, Observable<Void>> toAsync(Action5<T1, T2, T3, T4, T5> action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229606(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, R> Func5<T1, T2, T3, T4, T5, Observable<R>> toAsync(Func5<T1, T2, T3, T4, T5, R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh212138(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6> Func6<T1, T2, T3, T4, T5, T6, Observable<Void>> toAsync(Action6<T1, T2, T3, T4, T5, T6> action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229630(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, R> Func6<T1, T2, T3, T4, T5, T6, Observable<R>> toAsync(Func6<T1, T2, T3, T4, T5, T6, R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229808(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7> Func7<T1, T2, T3, T4, T5, T6, T7, Observable<Void>> toAsync(Action7<T1, T2, T3, T4, T5, T6, T7> action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229794(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, R> Func7<T1, T2, T3, T4, T5, T6, T7, Observable<R>> toAsync(Func7<T1, T2, T3, T4, T5, T6, T7, R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229361(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8> Func8<T1, T2, T3, T4, T5, T6, T7, T8, Observable<Void>> toAsync(Action8<T1, T2, T3, T4, T5, T6, T7, T8> action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh228956(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Func8<T1, T2, T3, T4, T5, T6, T7, T8, Observable<R>> toAsync(Func8<T1, T2, T3, T4, T5, T6, T7, T8, R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229662(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, T9> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, Observable<Void>> toAsync(Action9<T1, T2, T3, T4, T5, T6, T7, T8, T9> action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     * @see <a href='http://msdn.microsoft.com/en-us/library/hh229008(v=vs.103).aspx'>MSDN: Observable.ToAsync</a>
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, Observable<R>> toAsync(Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
+    /**
+     * Convert a synchronous action call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param action the action to convert
+     * @param scheduler the scheduler used to execute the {@code action}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code action} and emits {@code null}.
+     * 
+     */
+    public static FuncN<Observable<Void>> toAsync(ActionN action, Scheduler scheduler) {
+        return OperationToAsync.toAsync(action, scheduler);
+    }
+    /**
+     * Convert a synchronous function call into an asynchronous function
+     * call through an Observable sequence.
+     * 
+     * @param func the function to convert
+     * @param scheduler the scheduler used to call the {@code func}
+     * 
+     * @return a function which returns an observable sequence which
+     *         executes the {@code func} and emits its returned value.
+     * 
+     */
+    public static <R> FuncN<Observable<R>> toAsync(FuncN<R> func, Scheduler scheduler) {
+        return OperationToAsync.toAsync(func, scheduler);
+    }
     /**
      * Emit a specified set of items before beginning to emit items from the
      * source Observable.
diff --git a/rxjava-core/src/main/java/rx/concurrency/Schedulers.java b/rxjava-core/src/main/java/rx/concurrency/Schedulers.java
index 1b27b9bf0a..a44f01406e 100644
--- a/rxjava-core/src/main/java/rx/concurrency/Schedulers.java
+++ b/rxjava-core/src/main/java/rx/concurrency/Schedulers.java
@@ -96,7 +96,16 @@ public static Scheduler executor(ScheduledExecutorService executor) {
     public static Scheduler threadPoolForComputation() {
         return executor(COMPUTATION_EXECUTOR);
     }
-
+    /**
+     * {@link Scheduler} intended for asynchronous conversions.
+     * <p>
+     * Defaults to {@link #threadPoolForComputation()}.
+     * 
+     * @return {@link ExecutorScheduler} for asynchronous conversion work.
+     */
+    public static Scheduler threadPoolForAsyncConversions() {
+        return threadPoolForComputation();
+    }
     /**
      * {@link Scheduler} intended for IO-bound work.
      * <p>
diff --git a/rxjava-core/src/main/java/rx/operators/OperationToAsync.java b/rxjava-core/src/main/java/rx/operators/OperationToAsync.java
new file mode 100644
index 0000000000..e0987e4ca1
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/operators/OperationToAsync.java
@@ -0,0 +1,404 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package rx.operators;
+
+import rx.Observable;
+import rx.Scheduler;
+import rx.subjects.AsyncSubject;
+import rx.util.functions.Action0;
+import rx.util.functions.Action1;
+import rx.util.functions.Action2;
+import rx.util.functions.Action3;
+import rx.util.functions.Action4;
+import rx.util.functions.Action5;
+import rx.util.functions.Action6;
+import rx.util.functions.Action7;
+import rx.util.functions.Action8;
+import rx.util.functions.Action9;
+import rx.util.functions.ActionN;
+import rx.util.functions.Actions;
+import rx.util.functions.Func0;
+import rx.util.functions.Func1;
+import rx.util.functions.Func2;
+import rx.util.functions.Func3;
+import rx.util.functions.Func4;
+import rx.util.functions.Func5;
+import rx.util.functions.Func6;
+import rx.util.functions.Func7;
+import rx.util.functions.Func8;
+import rx.util.functions.Func9;
+import rx.util.functions.FuncN;
+
+/**
+ * Convert an action or function call into an asynchronous operation
+ * through an Observable.
+ */
+public final class OperationToAsync {
+    private OperationToAsync() { throw new IllegalStateException("No instances!"); }
+    /**
+     * Action0 with Scheduler.
+     */
+    public static Func0<Observable<Void>> toAsync(final Action0 action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func0 with Scheduler.
+     */
+    public static <R> Func0<Observable<R>> toAsync(final Func0<R> func, final Scheduler scheduler) {
+        return new Func0<Observable<R>>() {
+            @Override
+            public Observable<R> call() {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call();
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result);
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * Action1 with Scheduler.
+     */
+    public static <T1> Func1<T1, Observable<Void>> toAsync(final Action1<T1> action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func1 with Scheduler.
+     */
+    public static <T1, R> Func1<T1, Observable<R>> toAsync(final Func1<T1, R> func, final Scheduler scheduler) {
+        return new Func1<T1, Observable<R>>() {
+            @Override
+            public Observable<R> call(final T1 t1) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(t1);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result);
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * Action2 with Scheduler.
+     */
+    public static <T1, T2> Func2<T1, T2, Observable<Void>> toAsync(final Action2<T1, T2> action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func2 with Scheduler.
+     */
+    public static <T1, T2, R> Func2<T1, T2, Observable<R>> toAsync(final Func2<T1, T2, R> func, final Scheduler scheduler) {
+        return new Func2<T1, T2, Observable<R>>() {
+            @Override
+            public Observable<R> call(final T1 t1, final T2 t2) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(t1, t2);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result);
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * Action3 with Scheduler.
+     */
+    public static <T1, T2, T3> Func3<T1, T2, T3, Observable<Void>> toAsync(final Action3<T1, T2, T3> action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func3 with Scheduler.
+     */
+    public static <T1, T2, T3, R> Func3<T1, T2, T3, Observable<R>> toAsync(final Func3<T1, T2, T3, R> func, final Scheduler scheduler) {
+        return new Func3<T1, T2, T3, Observable<R>>() {
+            @Override
+            public Observable<R> call(final T1 t1, final T2 t2, final T3 t3) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(t1, t2, t3);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result); // Rx.NET: null value ?
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * Action4 with Scheduler.
+     */
+    public static <T1, T2, T3, T4> Func4<T1, T2, T3, T4, Observable<Void>> toAsync(final Action4<T1, T2, T3, T4> action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func4 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, R> Func4<T1, T2, T3, T4, Observable<R>> toAsync(final Func4<T1, T2, T3, T4, R> func, final Scheduler scheduler) {
+        return new Func4<T1, T2, T3, T4, Observable<R>>() {
+            @Override
+            public Observable<R> call(final T1 t1, final T2 t2, final T3 t3, final T4 t4) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(t1, t2, t3, t4);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result); // Rx.NET: null value ?
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * Action5 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5> Func5<T1, T2, T3, T4, T5, Observable<Void>> toAsync(final Action5<T1, T2, T3, T4, T5> action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func5 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5, R> Func5<T1, T2, T3, T4, T5, Observable<R>> toAsync(final Func5<T1, T2, T3, T4, T5, R> func, final Scheduler scheduler) {
+        return new Func5<T1, T2, T3, T4, T5, Observable<R>>() {
+            @Override
+            public Observable<R> call(final T1 t1, final T2 t2, final T3 t3, final T4 t4, final T5 t5) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(t1, t2, t3, t4, t5);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result); // Rx.NET: null value ?
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * Action6 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5, T6> Func6<T1, T2, T3, T4, T5, T6, Observable<Void>> toAsync(final Action6<T1, T2, T3, T4, T5, T6> action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func6 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5, T6, R> Func6<T1, T2, T3, T4, T5, T6, Observable<R>> toAsync(final Func6<T1, T2, T3, T4, T5, T6, R> func, final Scheduler scheduler) {
+        return new Func6<T1, T2, T3, T4, T5, T6, Observable<R>>() {
+            @Override
+            public Observable<R> call(final T1 t1, final T2 t2, final T3 t3, final T4 t4, final T5 t5, final T6 t6) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(t1, t2, t3, t4, t5, t6);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result); // Rx.NET: null value ?
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * Action7 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7> Func7<T1, T2, T3, T4, T5, T6, T7, Observable<Void>> toAsync(final Action7<T1, T2, T3, T4, T5, T6, T7> action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func7 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, R> Func7<T1, T2, T3, T4, T5, T6, T7, Observable<R>> toAsync(final Func7<T1, T2, T3, T4, T5, T6, T7, R> func, final Scheduler scheduler) {
+        return new Func7<T1, T2, T3, T4, T5, T6, T7, Observable<R>>() {
+            @Override
+            public Observable<R> call(final T1 t1, final T2 t2, final T3 t3, final T4 t4, final T5 t5, final T6 t6, final T7 t7) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(t1, t2, t3, t4, t5, t6, t7);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result); // Rx.NET: null value ?
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * Action8 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8> Func8<T1, T2, T3, T4, T5, T6, T7, T8, Observable<Void>> toAsync(final Action8<T1, T2, T3, T4, T5, T6, T7, T8> action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func8 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Func8<T1, T2, T3, T4, T5, T6, T7, T8, Observable<R>> toAsync(final Func8<T1, T2, T3, T4, T5, T6, T7, T8, R> func, final Scheduler scheduler) {
+        return new Func8<T1, T2, T3, T4, T5, T6, T7, T8, Observable<R>>() {
+            @Override
+            public Observable<R> call(final T1 t1, final T2 t2, final T3 t3, final T4 t4, final T5 t5, final T6 t6, final T7 t7, final T8 t8) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(t1, t2, t3, t4, t5, t6, t7, t8);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result); // Rx.NET: null value ?
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * Action9 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, T9> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, Observable<Void>> toAsync(final Action9<T1, T2, T3, T4, T5, T6, T7, T8, T9> action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * Func9 with Scheduler.
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, Observable<R>> toAsync(final Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, R> func, final Scheduler scheduler) {
+        return new Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, Observable<R>>() {
+            @Override
+            public Observable<R> call(final T1 t1, final T2 t2, final T3 t3, final T4 t4, final T5 t5, final T6 t6, final T7 t7, final T8 t8, final T9 t9) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(t1, t2, t3, t4, t5, t6, t7, t8, t9);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result); // Rx.NET: null value ?
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+    /**
+     * ActionN with Scheduler.
+     */
+    public static FuncN<Observable<Void>> toAsync(final ActionN action, final Scheduler scheduler) {
+        return toAsync(Actions.toFunc(action), scheduler);
+    }
+    /**
+     * FuncN with Scheduler.
+     */
+    public static <R> FuncN<Observable<R>> toAsync(final FuncN<R> func, final Scheduler scheduler) {
+        return new FuncN<Observable<R>>() {
+            @Override
+            public Observable<R> call(final Object... args) {
+                final AsyncSubject<R> subject = AsyncSubject.create();
+                scheduler.schedule(new Action0() {
+                    @Override
+                    public void call() {
+                        R result;
+                        try {
+                            result = func.call(args);
+                        } catch (Throwable t) {
+                            subject.onError(t);
+                            return;
+                        }
+                        subject.onNext(result);
+                        subject.onCompleted();
+                    }
+                });
+                return subject;
+            }
+        };
+    }
+}
diff --git a/rxjava-core/src/main/java/rx/util/functions/Action4.java b/rxjava-core/src/main/java/rx/util/functions/Action4.java
new file mode 100644
index 0000000000..f4126fcb95
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/util/functions/Action4.java
@@ -0,0 +1,24 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package rx.util.functions;
+
+/**
+ * A four-argument action.
+ */
+public interface Action4<T1, T2, T3, T4> extends Action {
+    void call(T1 t1, T2 t2, T3 t3, T4 t4);
+}
diff --git a/rxjava-core/src/main/java/rx/util/functions/Action5.java b/rxjava-core/src/main/java/rx/util/functions/Action5.java
new file mode 100644
index 0000000000..14d4bfa666
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/util/functions/Action5.java
@@ -0,0 +1,24 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package rx.util.functions;
+
+/**
+ * A five-argument action.
+ */
+public interface Action5<T1, T2, T3, T4, T5> extends Action {
+    void call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5);
+}
diff --git a/rxjava-core/src/main/java/rx/util/functions/Action6.java b/rxjava-core/src/main/java/rx/util/functions/Action6.java
new file mode 100644
index 0000000000..69cda2fe69
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/util/functions/Action6.java
@@ -0,0 +1,24 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package rx.util.functions;
+
+/**
+ * A six-argument action.
+ */
+public interface Action6<T1, T2, T3, T4, T5, T6> extends Action {
+    void call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6);
+}
diff --git a/rxjava-core/src/main/java/rx/util/functions/Action7.java b/rxjava-core/src/main/java/rx/util/functions/Action7.java
new file mode 100644
index 0000000000..1b7a5ade64
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/util/functions/Action7.java
@@ -0,0 +1,23 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package rx.util.functions;
+
+/**
+ * A seven-argument action.
+ */
+public interface Action7<T1, T2, T3, T4, T5, T6, T7> extends Action {
+    void call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7);
+}
diff --git a/rxjava-core/src/main/java/rx/util/functions/Action8.java b/rxjava-core/src/main/java/rx/util/functions/Action8.java
new file mode 100644
index 0000000000..4ad0c7915d
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/util/functions/Action8.java
@@ -0,0 +1,23 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package rx.util.functions;
+
+/**
+ * An eight-argument action.
+ */
+public interface Action8<T1, T2, T3, T4, T5, T6, T7, T8> extends Action {
+    void call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7, T8 t8);
+}
diff --git a/rxjava-core/src/main/java/rx/util/functions/Action9.java b/rxjava-core/src/main/java/rx/util/functions/Action9.java
new file mode 100644
index 0000000000..09a82f4949
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/util/functions/Action9.java
@@ -0,0 +1,23 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package rx.util.functions;
+
+/**
+ * A nine-argument action.
+ */
+public interface Action9<T1, T2, T3, T4, T5, T6, T7, T8, T9> extends Action {
+    void call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7, T8 t8, T9 t9);
+}
diff --git a/rxjava-core/src/main/java/rx/util/functions/ActionN.java b/rxjava-core/src/main/java/rx/util/functions/ActionN.java
new file mode 100644
index 0000000000..b7ef56252f
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/util/functions/ActionN.java
@@ -0,0 +1,23 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package rx.util.functions;
+
+/**
+ * A vector-argument action.
+ */
+public interface ActionN extends Action {
+    void call(Object... args);
+}
diff --git a/rxjava-core/src/main/java/rx/util/functions/Actions.java b/rxjava-core/src/main/java/rx/util/functions/Actions.java
new file mode 100644
index 0000000000..e4d916198e
--- /dev/null
+++ b/rxjava-core/src/main/java/rx/util/functions/Actions.java
@@ -0,0 +1,310 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package rx.util.functions;
+
+/**
+ * Utility class to support the Action0 .. Action9, ActionN interfaces.
+ */
+public final class Actions {
+    private Actions() { throw new IllegalStateException("No instances!"); }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static Func0<Void> toFunc(final Action0 action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static <T1> Func1<T1, Void> toFunc(final Action1<T1> action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static <T1, T2> Func2<T1, T2, Void> toFunc(final Action2<T1, T2> action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3> Func3<T1, T2, T3, Void> toFunc(final Action3<T1, T2, T3> action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4> Func4<T1, T2, T3, T4, Void> toFunc(final Action4<T1, T2, T3, T4> action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5> Func5<T1, T2, T3, T4, T5, Void> toFunc(
+            final Action5<T1, T2, T3, T4, T5> action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5, T6> Func6<T1, T2, T3, T4, T5, T6, Void> toFunc(
+            final Action6<T1, T2, T3, T4, T5, T6> action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7> Func7<T1, T2, T3, T4, T5, T6, T7, Void> toFunc(
+            final Action7<T1, T2, T3, T4, T5, T6, T7> action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8> Func8<T1, T2, T3, T4, T5, T6, T7, T8, Void> toFunc(
+            final Action8<T1, T2, T3, T4, T5, T6, T7, T8> action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, T9> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, Void> toFunc(
+            final Action9<T1, T2, T3, T4, T5, T6, T7, T8, T9> action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @return {@link Func0}
+     */
+    public static FuncN<Void> toFunc(
+            final ActionN action) {
+        return toFunc(action, (Void)null);
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns the given result.
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <R> Func0<R> toFunc(final Action0 action, final R result) {
+        return new Func0<R>() {
+            @Override
+            public R call() {
+                action.call();
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <T1, R> Func1<T1, R> toFunc(final Action1<T1> action, final R result) {
+        return new Func1<T1, R>() {
+            @Override
+            public R call(T1 t1) {
+                action.call(t1);
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <T1, T2, R> Func2<T1, T2, R> toFunc(final Action2<T1, T2> action, final R result) {
+        return new Func2<T1, T2, R>() {
+            @Override
+            public R call(T1 t1, T2 t2) {
+                action.call(t1, t2);
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, R> Func3<T1, T2, T3, R> toFunc(final Action3<T1, T2, T3> action, final R result) {
+        return new Func3<T1, T2, T3, R>() {
+            @Override
+            public R call(T1 t1, T2 t2, T3 t3) {
+                action.call(t1, t2, t3);
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, R> Func4<T1, T2, T3, T4, R> toFunc(final Action4<T1, T2, T3, T4> action, final R result) {
+        return new Func4<T1, T2, T3, T4, R>() {
+            @Override
+            public R call(T1 t1, T2 t2, T3 t3, T4 t4) {
+                action.call(t1, t2, t3, t4);
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5, R> Func5<T1, T2, T3, T4, T5, R> toFunc(
+            final Action5<T1, T2, T3, T4, T5> action, final R result) {
+        return new Func5<T1, T2, T3, T4, T5, R>() {
+            @Override
+            public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5) {
+                action.call(t1, t2, t3, t4, t5);
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5, T6, R> Func6<T1, T2, T3, T4, T5, T6, R> toFunc(
+            final Action6<T1, T2, T3, T4, T5, T6> action, final R result) {
+        return new Func6<T1, T2, T3, T4, T5, T6, R>() {
+            @Override
+            public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6) {
+                action.call(t1, t2, t3, t4, t5, t6);
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, R> Func7<T1, T2, T3, T4, T5, T6, T7, R> toFunc(
+            final Action7<T1, T2, T3, T4, T5, T6, T7> action, final R result) {
+        return new Func7<T1, T2, T3, T4, T5, T6, T7, R>() {
+            @Override
+            public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7) {
+                action.call(t1, t2, t3, t4, t5, t6, t7);
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Func8<T1, T2, T3, T4, T5, T6, T7, T8, R> toFunc(
+            final Action8<T1, T2, T3, T4, T5, T6, T7, T8> action, final R result) {
+        return new Func8<T1, T2, T3, T4, T5, T6, T7, T8, R>() {
+            @Override
+            public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7, T8 t8) {
+                action.call(t1, t2, t3, t4, t5, t6, t7, t8);
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, R> toFunc(
+            final Action9<T1, T2, T3, T4, T5, T6, T7, T8, T9> action, final R result) {
+        return new Func9<T1, T2, T3, T4, T5, T6, T7, T8, T9, R>() {
+            @Override
+            public R call(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7, T8 t8, T9 t9) {
+                action.call(t1, t2, t3, t4, t5, t6, t7, t8, t9);
+                return result;
+            }
+        };
+    }
+    /**
+     * Convert an action to a function which calls
+     * the action returns Void (null).
+     * @param action
+     * @param result
+     * @return {@link Func0}
+     */
+    public static <R> FuncN<R> toFunc(
+            final ActionN action, final R result) {
+        return new FuncN<R>() {
+            @Override
+            public R call(Object... args) {
+                action.call(args);
+                return result;
+            }
+        };
+    }
+}
diff --git a/rxjava-core/src/test/java/rx/operators/OperationToAsyncTest.java b/rxjava-core/src/test/java/rx/operators/OperationToAsyncTest.java
new file mode 100644
index 0000000000..434cac862e
--- /dev/null
+++ b/rxjava-core/src/test/java/rx/operators/OperationToAsyncTest.java
@@ -0,0 +1,653 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package rx.operators;
+
+import java.util.concurrent.atomic.AtomicInteger;
+import junit.framework.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import static org.mockito.Matchers.any;
+import org.mockito.Mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import org.mockito.MockitoAnnotations;
+import rx.Observer;
+import rx.concurrency.Schedulers;
+import rx.util.functions.Action0;
+import rx.util.functions.Action1;
+import rx.util.functions.Action2;
+import rx.util.functions.Action3;
+import rx.util.functions.Action4;
+import rx.util.functions.Action5;
+import rx.util.functions.Action6;
+import rx.util.functions.Action7;
+import rx.util.functions.Action8;
+import rx.util.functions.Action9;
+import rx.util.functions.ActionN;
+import rx.util.functions.Func0;
+import rx.util.functions.Func1;
+import rx.util.functions.Func2;
+import rx.util.functions.Func3;
+import rx.util.functions.Func4;
+import rx.util.functions.Func5;
+import rx.util.functions.Func6;
+import rx.util.functions.Func7;
+import rx.util.functions.Func8;
+import rx.util.functions.Func9;
+import rx.util.functions.FuncN;
+
+public class OperationToAsyncTest {
+    @Mock
+    Observer<Object> observer;
+    @Before
+    public void before() {
+        MockitoAnnotations.initMocks(this);
+    }
+    @Test
+    public void testAction0() {
+        final AtomicInteger value = new AtomicInteger();
+        Action0 action = new Action0() {
+            @Override
+            public void call() {
+                value.incrementAndGet();
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call()
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(1, value.get());
+    }
+    @Test
+    public void testAction0Error() {
+        Action0 action = new Action0() {
+            @Override
+            public void call() {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call()
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testAction1() {
+        final AtomicInteger value = new AtomicInteger();
+        Action1<Integer> action = new Action1<Integer>() {
+            @Override
+            public void call(Integer t1) {
+                value.set(t1);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(1, value.get());
+    }
+    @Test
+    public void testAction1Error() {
+        Action1<Integer> action = new Action1<Integer>() {
+            @Override
+            public void call(Integer t1) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testAction2() {
+        final AtomicInteger value = new AtomicInteger();
+        Action2<Integer, Integer> action = new Action2<Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2) {
+                value.set(t1 | t2);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(3, value.get());
+    }
+    @Test
+    public void testAction2Error() {
+        Action2<Integer, Integer> action = new Action2<Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testAction3() {
+        final AtomicInteger value = new AtomicInteger();
+        Action3<Integer, Integer, Integer> action = new Action3<Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3) {
+                value.set(t1 | t2 | t3);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(7, value.get());
+    }
+    @Test
+    public void testAction3Error() {
+        Action3<Integer, Integer, Integer> action = new Action3<Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testAction4() {
+        final AtomicInteger value = new AtomicInteger();
+        Action4<Integer, Integer, Integer, Integer> action = new Action4<Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4) {
+                value.set(t1 | t2 | t3 | t4);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(15, value.get());
+    }
+    @Test
+    public void testAction4Error() {
+        Action4<Integer, Integer, Integer, Integer> action = new Action4<Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testAction5() {
+        final AtomicInteger value = new AtomicInteger();
+        Action5<Integer, Integer, Integer, Integer, Integer> action = new Action5<Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5) {
+                value.set(t1 | t2 | t3 | t4 | t5);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(31, value.get());
+    }
+    @Test
+    public void testAction5Error() {
+        Action5<Integer, Integer, Integer, Integer, Integer> action = new Action5<Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testAction6() {
+        final AtomicInteger value = new AtomicInteger();
+        Action6<Integer, Integer, Integer, Integer, Integer, Integer> action = new Action6<Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6) {
+                value.set(t1 | t2 | t3 | t4 | t5 | t6);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(63, value.get());
+    }
+    @Test
+    public void testAction6Error() {
+        Action6<Integer, Integer, Integer, Integer, Integer, Integer> action = new Action6<Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testAction7() {
+        final AtomicInteger value = new AtomicInteger();
+        Action7<Integer, Integer, Integer, Integer, Integer, Integer, Integer> action = new Action7<Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7) {
+                value.set(t1 | t2 | t3 | t4 | t5 | t6 | t7);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(127, value.get());
+    }
+    @Test
+    public void testAction7Error() {
+        Action7<Integer, Integer, Integer, Integer, Integer, Integer, Integer> action = new Action7<Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testAction8() {
+        final AtomicInteger value = new AtomicInteger();
+        Action8<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer> action = new Action8<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7, Integer t8) {
+                value.set(t1 | t2 | t3 | t4 | t5 | t6 | t7 | t8);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64, 128)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(255, value.get());
+    }
+    @Test
+    public void testAction8Error() {
+        Action8<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer> action = new Action8<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7, Integer t8) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64, 128)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testAction9() {
+        final AtomicInteger value = new AtomicInteger();
+        Action9<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer> action = new Action9<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7, Integer t8, Integer t9) {
+                value.set(t1 | t2 | t3 | t4 | t5 | t6 | t7 | t8 | t9);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64, 128, 256)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(511, value.get());
+    }
+    @Test
+    public void testAction9Error() {
+        Action9<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer> action = new Action9<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public void call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7, Integer t8, Integer t9) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64, 128, 256)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testActionN() {
+        final AtomicInteger value = new AtomicInteger();
+        ActionN action = new ActionN() {
+            @Override
+            public void call(Object... args) {
+                int i = 0;
+                for (Object o : args) {
+                    i = i | (Integer)o;
+                }
+                value.set(i);
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64, 128, 256, 512)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(null);
+        verify(observer, times(1)).onCompleted();
+        
+        Assert.assertEquals(1023, value.get());
+    }
+    @Test
+    public void testActionNError() {
+        ActionN action = new ActionN() {
+            @Override
+            public void call(Object... args) {
+                throw new RuntimeException("Forced failure");
+            }
+        };
+        
+        OperationToAsync.toAsync(action, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64, 128, 256, 512)
+                .subscribe(observer);
+        
+        verify(observer, times(1)).onError(any(Throwable.class));
+        verify(observer, never()).onNext(null);
+        verify(observer, never()).onCompleted();
+    }
+    @Test
+    public void testFunc0() {
+        Func0<Integer> func = new Func0<Integer>() {
+            @Override
+            public Integer call() {
+                return 0;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call()
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(0);
+        verify(observer, times(1)).onCompleted();
+        
+    }
+    @Test
+    public void testFunc1() {
+        Func1<Integer, Integer> func = new Func1<Integer, Integer>() {
+            @Override
+            public Integer call(Integer t1) {
+                return t1;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(1);
+        verify(observer, times(1)).onCompleted();
+    }
+    @Test
+    public void testFunc2() {
+        Func2<Integer, Integer, Integer> func = new Func2<Integer, Integer, Integer>() {
+            @Override
+            public Integer call(Integer t1, Integer t2) {
+                return t1 | t2;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1, 2)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(3);
+        verify(observer, times(1)).onCompleted();
+    }
+    @Test
+    public void testFunc3() {
+        Func3<Integer, Integer, Integer, Integer> func = new Func3<Integer, Integer, Integer, Integer>() {
+            @Override
+            public Integer call(Integer t1, Integer t2, Integer t3) {
+                return t1 | t2 | t3;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1, 2, 4)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(7);
+        verify(observer, times(1)).onCompleted();
+    }
+    @Test
+    public void testFunc4() {
+        Func4<Integer, Integer, Integer, Integer, Integer> func = new Func4<Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public Integer call(Integer t1, Integer t2, Integer t3, Integer t4) {
+                return t1 | t2 | t3 | t4;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1, 2, 4, 8)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(15);
+        verify(observer, times(1)).onCompleted();
+    }
+    @Test
+    public void testFunc5() {
+        Func5<Integer, Integer, Integer, Integer, Integer, Integer> func = new Func5<Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public Integer call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5) {
+                return t1 | t2 | t3 | t4 | t5;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(31);
+        verify(observer, times(1)).onCompleted();
+    }
+    @Test
+    public void testFunc6() {
+        Func6<Integer, Integer, Integer, Integer, Integer, Integer, Integer> func = new Func6<Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public Integer call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6) {
+                return t1 | t2 | t3 | t4 | t5 | t6;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(63);
+        verify(observer, times(1)).onCompleted();
+    }
+    @Test
+    public void testFunc7() {
+        Func7<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer> func = new Func7<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public Integer call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7) {
+                return t1 | t2 | t3 | t4 | t5 | t6 | t7;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(127);
+        verify(observer, times(1)).onCompleted();
+    }
+    @Test
+    public void testFunc8() {
+        Func8<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer> func = new Func8<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public Integer call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7, Integer t8) {
+                return t1 | t2 | t3 | t4 | t5 | t6 | t7 | t8;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64, 128)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(255);
+        verify(observer, times(1)).onCompleted();
+    }
+    @Test
+    public void testFunc9() {
+        Func9<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer> func = new Func9<Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer, Integer>() {
+            @Override
+            public Integer call(Integer t1, Integer t2, Integer t3, Integer t4, Integer t5, Integer t6, Integer t7, Integer t8, Integer t9) {
+                return t1 | t2 | t3 | t4 | t5 | t6 | t7 | t8 | t9;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64, 128, 256)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(511);
+        verify(observer, times(1)).onCompleted();
+    }
+    @Test
+    public void testFuncN() {
+        FuncN<Integer> func = new FuncN<Integer>() {
+            @Override
+            public Integer call(Object... args) {
+                int i = 0;
+                for (Object o : args) {
+                    i = i | (Integer)o;
+                }
+                return i;
+            }
+        };
+        OperationToAsync.toAsync(func, Schedulers.immediate())
+                .call(1, 2, 4, 8, 16, 32, 64, 128, 256, 512)
+                .subscribe(observer);
+        
+        verify(observer, never()).onError(any(Throwable.class));
+        verify(observer, times(1)).onNext(1023);
+        verify(observer, times(1)).onCompleted();
+    }
+}