/
LooperScheduler.java
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/
LooperScheduler.java
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/*
* 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.android.schedulers;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import java.util.concurrent.TimeUnit;
import rx.Scheduler;
import rx.Subscription;
import rx.android.plugins.RxAndroidPlugins;
import rx.android.plugins.RxAndroidSchedulersHook;
import rx.exceptions.OnErrorNotImplementedException;
import rx.functions.Action0;
import rx.plugins.RxJavaPlugins;
import rx.subscriptions.Subscriptions;
class LooperScheduler extends Scheduler {
private final Handler handler;
LooperScheduler(Looper looper) {
handler = new Handler(looper);
}
LooperScheduler(Handler handler) {
this.handler = handler;
}
@Override
public Worker createWorker() {
return new HandlerWorker(handler);
}
static class HandlerWorker extends Worker {
private final Handler handler;
private final RxAndroidSchedulersHook hook;
private volatile boolean unsubscribed;
HandlerWorker(Handler handler) {
this.handler = handler;
this.hook = RxAndroidPlugins.getInstance().getSchedulersHook();
}
@Override
public void unsubscribe() {
unsubscribed = true;
handler.removeCallbacksAndMessages(this /* token */);
}
@Override
public boolean isUnsubscribed() {
return unsubscribed;
}
@Override
public Subscription schedule(Action0 action, long delayTime, TimeUnit unit) {
if (unsubscribed) {
return Subscriptions.unsubscribed();
}
action = hook.onSchedule(action);
ScheduledAction scheduledAction = new ScheduledAction(action, handler);
Message message = Message.obtain(handler, scheduledAction);
message.obj = this; // Used as token for unsubscription operation.
handler.sendMessageDelayed(message, unit.toMillis(delayTime));
if (unsubscribed) {
handler.removeCallbacks(scheduledAction);
return Subscriptions.unsubscribed();
}
return scheduledAction;
}
@Override
public Subscription schedule(final Action0 action) {
return schedule(action, 0, TimeUnit.MILLISECONDS);
}
}
static final class ScheduledAction implements Runnable, Subscription {
private final Action0 action;
private final Handler handler;
private volatile boolean unsubscribed;
ScheduledAction(Action0 action, Handler handler) {
this.action = action;
this.handler = handler;
}
@Override public void run() {
try {
action.call();
} catch (Throwable e) {
// nothing to do but print a System error as this is fatal and there is nowhere else to throw this
IllegalStateException ie;
if (e instanceof OnErrorNotImplementedException) {
ie = new IllegalStateException("Exception thrown on Scheduler.Worker thread. Add `onError` handling.", e);
} else {
ie = new IllegalStateException("Fatal Exception thrown on Scheduler.Worker thread.", e);
}
RxJavaPlugins.getInstance().getErrorHandler().handleError(ie);
Thread thread = Thread.currentThread();
thread.getUncaughtExceptionHandler().uncaughtException(thread, ie);
}
}
@Override public void unsubscribe() {
unsubscribed = true;
handler.removeCallbacks(this);
}
@Override public boolean isUnsubscribed() {
return unsubscribed;
}
}
}