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| /* | ||
| * Copyright (c) 2011-2016 Pivotal Software Inc, All Rights Reserved. | ||
| * | ||
| * 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. | ||
| */ | ||
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| package reactor.core.publisher; | ||
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| import java.util.Objects; | ||
| import java.util.concurrent.atomic.*; | ||
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| import org.reactivestreams.*; | ||
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| import reactor.core.subscriber.DeferredScalarSubscriber; | ||
| import reactor.core.tuple.*; | ||
| import reactor.core.util.BackpressureUtils; | ||
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| /** | ||
| * Waits for all Mono sources to produce a value or terminate, and if | ||
| * all of them produced a value, emit a Tuple of those values; otherwise | ||
| * terminate. | ||
| * | ||
| * @param <T> the source value types | ||
| */ | ||
| public final class MonoWhen<T> extends Mono<Tuple> { | ||
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| final Mono<? extends T>[] sources; | ||
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| final Iterable<? extends Mono<? extends T>> sourcesIterable; | ||
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| @SafeVarargs | ||
| public MonoWhen(Mono<? extends T>... sources) { | ||
| this.sources = Objects.requireNonNull(sources, "sources"); | ||
| this.sourcesIterable = null; | ||
| } | ||
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| public MonoWhen(Iterable<? extends Mono<? extends T>> sourcesIterable) { | ||
| this.sources = null; | ||
| this.sourcesIterable = Objects.requireNonNull(sourcesIterable, "sourcesIterable"); | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| @Override | ||
| public void subscribe(Subscriber<? super Tuple> s) { | ||
| Mono<? extends T>[] a; | ||
| int n = 0; | ||
| if (sources != null) { | ||
| a = sources; | ||
| n = a.length; | ||
| } else { | ||
| a = new Mono[8]; | ||
| for (Mono<? extends T> m : sourcesIterable) { | ||
| if (n == a.length) { | ||
| Mono<? extends T>[] b = new Mono[n + (n >> 2)]; | ||
| System.arraycopy(a, 0, b, 0, n); | ||
| a = b; | ||
| } | ||
| a[n++] = m; | ||
| } | ||
| } | ||
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| MonoWhenCoordinator<T> parent = new MonoWhenCoordinator<>(s, n); | ||
| s.onSubscribe(parent); | ||
| parent.subscribe(a); | ||
| } | ||
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| static final class MonoWhenCoordinator<T> | ||
| extends DeferredScalarSubscriber<T, Tuple> | ||
| implements Subscription { | ||
| final MonoWhenSubscriber<T>[] subscribers; | ||
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| volatile int done; | ||
| @SuppressWarnings("rawtypes") | ||
| static final AtomicIntegerFieldUpdater<MonoWhenCoordinator> DONE = | ||
| AtomicIntegerFieldUpdater.newUpdater(MonoWhenCoordinator.class, "done"); | ||
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| @SuppressWarnings("unchecked") | ||
| public MonoWhenCoordinator(Subscriber<? super Tuple> subscriber, int n) { | ||
| super(subscriber); | ||
| subscribers = new MonoWhenSubscriber[n]; | ||
| for (int i = 0; i < n; i++) { | ||
| subscribers[i] = new MonoWhenSubscriber<>(this); | ||
| } | ||
| } | ||
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| void subscribe(Mono<? extends T>[] sources) { | ||
| MonoWhenSubscriber<T>[] a = subscribers; | ||
| for (int i = 0; i < a.length; i++) { | ||
| sources[i].subscribe(a[i]); | ||
| } | ||
| } | ||
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| void signal() { | ||
| MonoWhenSubscriber<T>[] a = subscribers; | ||
| int n = a.length; | ||
| if (DONE.incrementAndGet(this) != n) { | ||
| return; | ||
| } | ||
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| Object[] o = new Object[n]; | ||
| Throwable error = null; | ||
| Throwable compositeError = null; | ||
| boolean hasEmpty = false; | ||
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| for (int i = 0; i < a.length; i++) { | ||
| MonoWhenSubscriber<T> m = a[i]; | ||
| T v = m.value; | ||
| if (v != null) { | ||
| o[i] = v; | ||
| } else { | ||
| Throwable e = m.error; | ||
| if (e != null) { | ||
| if (compositeError != null) { | ||
| compositeError.addSuppressed(e); | ||
| } else | ||
| if (error != null) { | ||
| compositeError = new Throwable("Multiple errors"); | ||
| compositeError.addSuppressed(error); | ||
| compositeError.addSuppressed(e); | ||
| } else { | ||
| error = e; | ||
| } | ||
| } else { | ||
| hasEmpty = true; | ||
| } | ||
| } | ||
| } | ||
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| if (compositeError != null) { | ||
| subscriber.onError(compositeError); | ||
| } else | ||
| if (error != null) { | ||
| subscriber.onError(compositeError); | ||
| } else | ||
| if (hasEmpty) { | ||
| subscriber.onComplete(); | ||
| } else { | ||
| complete(Tuple.of(o)); | ||
| } | ||
| } | ||
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| @Override | ||
| public void cancel() { | ||
| if (!isCancelled()) { | ||
| super.cancel(); | ||
| for (MonoWhenSubscriber<T> ms : subscribers) { | ||
| ms.cancel(); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| static final class MonoWhenSubscriber<T> implements Subscriber<T> { | ||
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| final MonoWhenCoordinator<T> parent; | ||
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| volatile Subscription s; | ||
| @SuppressWarnings("rawtypes") | ||
| static final AtomicReferenceFieldUpdater<MonoWhenSubscriber, Subscription> S = | ||
| AtomicReferenceFieldUpdater.newUpdater(MonoWhenSubscriber.class, Subscription.class, "s"); | ||
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| T value; | ||
| Throwable error; | ||
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| public MonoWhenSubscriber(MonoWhenCoordinator<T> parent) { | ||
| this.parent = parent; | ||
| } | ||
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| @Override | ||
| public void onSubscribe(Subscription s) { | ||
| if (BackpressureUtils.setOnce(S, this, s)) { | ||
| s.request(Long.MAX_VALUE); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onNext(T t) { | ||
| if (value == null) { | ||
| value = t; | ||
| parent.signal(); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onError(Throwable t) { | ||
| error = t; | ||
| parent.signal(); | ||
| } | ||
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| @Override | ||
| public void onComplete() { | ||
| parent.signal(); | ||
| } | ||
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| void cancel() { | ||
| BackpressureUtils.terminate(S, this); | ||
| } | ||
| } | ||
| } |