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Completable.java
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/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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 io.reactivex;
import java.util.concurrent.*;
import org.reactivestreams.Publisher;
import io.reactivex.annotations.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.*;
import io.reactivex.internal.functions.*;
import io.reactivex.internal.fuseable.*;
import io.reactivex.internal.observers.*;
import io.reactivex.internal.operators.completable.*;
import io.reactivex.internal.operators.maybe.*;
import io.reactivex.internal.operators.mixed.*;
import io.reactivex.internal.operators.single.SingleDelayWithCompletable;
import io.reactivex.internal.util.ExceptionHelper;
import io.reactivex.observers.TestObserver;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.schedulers.Schedulers;
/**
* The {@code Completable} class represents a deferred computation without any value but
* only indication for completion or exception.
* <p>
* {@code Completable} behaves similarly to {@link Observable} except that it can only emit either
* a completion or error signal (there is no {@code onNext} or {@code onSuccess} as with the other
* reactive types).
* <p>
* The {@code Completable} class implements the {@link CompletableSource} base interface and the default consumer
* type it interacts with is the {@link CompletableObserver} via the {@link #subscribe(CompletableObserver)} method.
* The {@code Completable} operates with the following sequential protocol:
* <pre><code>
* onSubscribe (onError | onComplete)?
* </code></pre>
* <p>
* Note that as with the {@code Observable} protocol, {@code onError} and {@code onComplete} are mutually exclusive events.
* <p>
* Like {@link Observable}, a running {@code Completable} can be stopped through the {@link Disposable} instance
* provided to consumers through {@link SingleObserver#onSubscribe}.
* <p>
* Like an {@code Observable}, a {@code Completable} is lazy, can be either "hot" or "cold", synchronous or
* asynchronous. {@code Completable} instances returned by the methods of this class are <em>cold</em>
* and there is a standard <em>hot</em> implementation in the form of a subject:
* {@link io.reactivex.subjects.CompletableSubject CompletableSubject}.
* <p>
* The documentation for this class makes use of marble diagrams. The following legend explains these diagrams:
* <p>
* <img width="640" height="577" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.png" alt="">
* <p>
* See {@link Flowable} or {@link Observable} for the
* implementation of the Reactive Pattern for a stream or vector of values.
* <p>
* Example:
* <pre><code>
* Disposable d = Completable.complete()
* .delay(10, TimeUnit.SECONDS, Schedulers.io())
* .subscribeWith(new DisposableCompletableObserver() {
* @Override
* public void onStart() {
* System.out.println("Started");
* }
*
* @Override
* public void onError(Throwable error) {
* error.printStackTrace();
* }
*
* @Override
* public void onComplete() {
* System.out.println("Done!");
* }
* });
*
* Thread.sleep(5000);
*
* d.dispose();
* </code></pre>
* <p>
* Note that by design, subscriptions via {@link #subscribe(CompletableObserver)} can't be cancelled/disposed
* from the outside (hence the
* {@code void} return of the {@link #subscribe(CompletableObserver)} method) and it is the
* responsibility of the implementor of the {@code CompletableObserver} to allow this to happen.
* RxJava supports such usage with the standard
* {@link io.reactivex.observers.DisposableCompletableObserver DisposableCompletableObserver} instance.
* For convenience, the {@link #subscribeWith(CompletableObserver)} method is provided as well to
* allow working with a {@code CompletableObserver} (or subclass) instance to be applied with in
* a fluent manner (such as in the example above).
*
* @see io.reactivex.observers.DisposableCompletableObserver
*/
public abstract class Completable implements CompletableSource {
/**
* Returns a Completable which terminates as soon as one of the source Completables
* terminates (normally or with an error) and cancels all other Completables.
* <p>
* <img width="640" height="518" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.ambArray.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code ambArray} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the array of source Completables. A subscription to each source will
* occur in the same order as in this array.
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable ambArray(final CompletableSource... sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
if (sources.length == 0) {
return complete();
}
if (sources.length == 1) {
return wrap(sources[0]);
}
return RxJavaPlugins.onAssembly(new CompletableAmb(sources, null));
}
/**
* Returns a Completable which terminates as soon as one of the source Completables
* terminates (normally or with an error) and cancels all other Completables.
* <p>
* <img width="640" height="518" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.amb.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code amb} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the array of source Completables. A subscription to each source will
* occur in the same order as in this Iterable.
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable amb(final Iterable<? extends CompletableSource> sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new CompletableAmb(null, sources));
}
/**
* Returns a Completable instance that completes immediately when subscribed to.
* <p>
* <img width="640" height="472" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.complete.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code complete} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @return a Completable instance that completes immediately
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable complete() {
return RxJavaPlugins.onAssembly(CompletableEmpty.INSTANCE);
}
/**
* Returns a Completable which completes only when all sources complete, one after another.
* <p>
* <img width="640" height="283" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.concatArray.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatArray} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the sources to concatenate
* @return the Completable instance which completes only when all sources complete
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable concatArray(CompletableSource... sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
if (sources.length == 0) {
return complete();
} else
if (sources.length == 1) {
return wrap(sources[0]);
}
return RxJavaPlugins.onAssembly(new CompletableConcatArray(sources));
}
/**
* Returns a Completable which completes only when all sources complete, one after another.
* <p>
* <img width="640" height="303" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.concat.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the sources to concatenate
* @return the Completable instance which completes only when all sources complete
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable concat(Iterable<? extends CompletableSource> sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new CompletableConcatIterable(sources));
}
/**
* Returns a Completable which completes only when all sources complete, one after another.
* <p>
* <img width="640" height="237" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.concat.p.png" alt="">
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The returned {@code Completable} honors the backpressure of the downstream consumer
* and expects the other {@code Publisher} to honor it as well.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the sources to concatenate
* @return the Completable instance which completes only when all sources complete
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@BackpressureSupport(BackpressureKind.FULL)
public static Completable concat(Publisher<? extends CompletableSource> sources) {
return concat(sources, 2);
}
/**
* Returns a Completable which completes only when all sources complete, one after another.
* <p>
* <img width="640" height="237" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.concat.pn.png" alt="">
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The returned {@code Completable} honors the backpressure of the downstream consumer
* and expects the other {@code Publisher} to honor it as well.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the sources to concatenate
* @param prefetch the number of sources to prefetch from the sources
* @return the Completable instance which completes only when all sources complete
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@BackpressureSupport(BackpressureKind.FULL)
public static Completable concat(Publisher<? extends CompletableSource> sources, int prefetch) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.verifyPositive(prefetch, "prefetch");
return RxJavaPlugins.onAssembly(new CompletableConcat(sources, prefetch));
}
/**
* Provides an API (via a cold Completable) that bridges the reactive world with the callback-style world.
* <p>
* <img width="640" height="442" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.create.png" alt="">
* <p>
* Example:
* <pre><code>
* Completable.create(emitter -> {
* Callback listener = new Callback() {
* @Override
* public void onEvent(Event e) {
* emitter.onComplete();
* }
*
* @Override
* public void onFailure(Exception e) {
* emitter.onError(e);
* }
* };
*
* AutoCloseable c = api.someMethod(listener);
*
* emitter.setCancellable(c::close);
*
* });
* </code></pre>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code create} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param source the emitter that is called when a CompletableObserver subscribes to the returned {@code Completable}
* @return the new Completable instance
* @see CompletableOnSubscribe
* @see Cancellable
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable create(CompletableOnSubscribe source) {
ObjectHelper.requireNonNull(source, "source is null");
return RxJavaPlugins.onAssembly(new CompletableCreate(source));
}
/**
* Constructs a Completable instance by wrapping the given source callback
* <strong>without any safeguards; you should manage the lifecycle and response
* to downstream cancellation/dispose</strong>.
* <p>
* <img width="640" height="260" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.unsafeCreate.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code unsafeCreate} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param source the callback which will receive the CompletableObserver instances
* when the Completable is subscribed to.
* @return the created Completable instance
* @throws NullPointerException if source is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable unsafeCreate(CompletableSource source) {
ObjectHelper.requireNonNull(source, "source is null");
if (source instanceof Completable) {
throw new IllegalArgumentException("Use of unsafeCreate(Completable)!");
}
return RxJavaPlugins.onAssembly(new CompletableFromUnsafeSource(source));
}
/**
* Defers the subscription to a Completable instance returned by a supplier.
* <p>
* <img width="640" height="298" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.defer.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code defer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param completableSupplier the supplier that returns the Completable that will be subscribed to.
* @return the Completable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable defer(final Callable<? extends CompletableSource> completableSupplier) {
ObjectHelper.requireNonNull(completableSupplier, "completableSupplier");
return RxJavaPlugins.onAssembly(new CompletableDefer(completableSupplier));
}
/**
* Creates a Completable which calls the given error supplier for each subscriber
* and emits its returned Throwable.
* <p>
* <img width="640" height="462" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.error.f.png" alt="">
* <p>
* If the errorSupplier returns null, the child CompletableObservers will receive a
* NullPointerException.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code error} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param errorSupplier the error supplier, not null
* @return the new Completable instance
* @throws NullPointerException if errorSupplier is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable error(final Callable<? extends Throwable> errorSupplier) {
ObjectHelper.requireNonNull(errorSupplier, "errorSupplier is null");
return RxJavaPlugins.onAssembly(new CompletableErrorSupplier(errorSupplier));
}
/**
* Creates a Completable instance that emits the given Throwable exception to subscribers.
* <p>
* <img width="640" height="462" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.error.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code error} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param error the Throwable instance to emit, not null
* @return the new Completable instance
* @throws NullPointerException if error is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable error(final Throwable error) {
ObjectHelper.requireNonNull(error, "error is null");
return RxJavaPlugins.onAssembly(new CompletableError(error));
}
/**
* Returns a Completable instance that runs the given Action for each subscriber and
* emits either an unchecked exception or simply completes.
* <p>
* <img width="640" height="297" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.fromAction.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromAction} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param run the runnable to run for each subscriber
* @return the new Completable instance
* @throws NullPointerException if run is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable fromAction(final Action run) {
ObjectHelper.requireNonNull(run, "run is null");
return RxJavaPlugins.onAssembly(new CompletableFromAction(run));
}
/**
* Returns a Completable which when subscribed, executes the callable function, ignores its
* normal result and emits onError or onComplete only.
* <p>
* <img width="640" height="286" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.fromCallable.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromCallable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param callable the callable instance to execute for each subscriber
* @return the new Completable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable fromCallable(final Callable<?> callable) {
ObjectHelper.requireNonNull(callable, "callable is null");
return RxJavaPlugins.onAssembly(new CompletableFromCallable(callable));
}
/**
* Returns a Completable instance that reacts to the termination of the given Future in a blocking fashion.
* <p>
* <img width="640" height="628" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.fromFuture.png" alt="">
* <p>
* Note that cancellation from any of the subscribers to this Completable will cancel the future.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromFuture} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param future the future to react to
* @return the new Completable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable fromFuture(final Future<?> future) {
ObjectHelper.requireNonNull(future, "future is null");
return fromAction(Functions.futureAction(future));
}
/**
* Returns a Completable instance that when subscribed to, subscribes to the {@code Maybe} instance and
* emits a completion event if the maybe emits {@code onSuccess}/{@code onComplete} or forwards any
* {@code onError} events.
* <p>
* <img width="640" height="235" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.fromMaybe.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromMaybe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* <p>History: 2.1.17 - beta
* @param <T> the value type of the {@link MaybeSource} element
* @param maybe the Maybe instance to subscribe to, not null
* @return the new Completable instance
* @throws NullPointerException if single is null
* @since 2.2
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Completable fromMaybe(final MaybeSource<T> maybe) {
ObjectHelper.requireNonNull(maybe, "maybe is null");
return RxJavaPlugins.onAssembly(new MaybeIgnoreElementCompletable<T>(maybe));
}
/**
* Returns a Completable instance that runs the given Runnable for each subscriber and
* emits either its exception or simply completes.
* <p>
* <img width="640" height="297" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.fromRunnable.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromRunnable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param run the runnable to run for each subscriber
* @return the new Completable instance
* @throws NullPointerException if run is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable fromRunnable(final Runnable run) {
ObjectHelper.requireNonNull(run, "run is null");
return RxJavaPlugins.onAssembly(new CompletableFromRunnable(run));
}
/**
* Returns a Completable instance that subscribes to the given Observable, ignores all values and
* emits only the terminal event.
* <p>
* <img width="640" height="414" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.fromObservable.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromObservable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the type of the Observable
* @param observable the Observable instance to subscribe to, not null
* @return the new Completable instance
* @throws NullPointerException if flowable is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Completable fromObservable(final ObservableSource<T> observable) {
ObjectHelper.requireNonNull(observable, "observable is null");
return RxJavaPlugins.onAssembly(new CompletableFromObservable<T>(observable));
}
/**
* Returns a Completable instance that subscribes to the given publisher, ignores all values and
* emits only the terminal event.
* <p>
* <img width="640" height="422" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.fromPublisher.png" alt="">
* <p>
* The {@link Publisher} must follow the
* <a href="https://github.com/reactive-streams/reactive-streams-jvm#reactive-streams">Reactive-Streams specification</a>.
* Violating the specification may result in undefined behavior.
* <p>
* If possible, use {@link #create(CompletableOnSubscribe)} to create a
* source-like {@code Completable} instead.
* <p>
* Note that even though {@link Publisher} appears to be a functional interface, it
* is not recommended to implement it through a lambda as the specification requires
* state management that is not achievable with a stateless lambda.
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The returned {@code Completable} honors the backpressure of the downstream consumer
* and expects the other {@code Publisher} to honor it as well.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromPublisher} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the type of the publisher
* @param publisher the Publisher instance to subscribe to, not null
* @return the new Completable instance
* @throws NullPointerException if publisher is null
* @see #create(CompletableOnSubscribe)
*/
@CheckReturnValue
@BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Completable fromPublisher(final Publisher<T> publisher) {
ObjectHelper.requireNonNull(publisher, "publisher is null");
return RxJavaPlugins.onAssembly(new CompletableFromPublisher<T>(publisher));
}
/**
* Returns a Completable instance that when subscribed to, subscribes to the Single instance and
* emits a completion event if the single emits onSuccess or forwards any onError events.
* <p>
* <img width="640" height="356" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.fromSingle.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromSingle} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type of the Single
* @param single the Single instance to subscribe to, not null
* @return the new Completable instance
* @throws NullPointerException if single is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Completable fromSingle(final SingleSource<T> single) {
ObjectHelper.requireNonNull(single, "single is null");
return RxJavaPlugins.onAssembly(new CompletableFromSingle<T>(single));
}
/**
* Returns a Completable instance that subscribes to all sources at once and
* completes only when all source Completables complete or one of them emits an error.
* <p>
* <img width="640" height="270" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.mergeArray.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeArray} does not operate by default on a particular {@link Scheduler}.</dd>
* <dt><b>Error handling:</b></dt>
* <dd>If any of the source {@code CompletableSource}s signal a {@code Throwable} via {@code onError}, the resulting
* {@code Completable} terminates with that {@code Throwable} and all other source {@code CompletableSource}s are cancelled.
* If more than one {@code CompletableSource} signals an error, the resulting {@code Completable} may terminate with the
* first one's error or, depending on the concurrency of the sources, may terminate with a
* {@code CompositeException} containing two or more of the various error signals.
* {@code Throwable}s that didn't make into the composite will be sent (individually) to the global error handler via
* {@link RxJavaPlugins#onError(Throwable)} method as {@code UndeliverableException} errors. Similarly, {@code Throwable}s
* signaled by source(s) after the returned {@code Completable} has been cancelled or terminated with a
* (composite) error will be sent to the same global error handler.
* Use {@link #mergeArrayDelayError(CompletableSource...)} to merge sources and terminate only when all source {@code CompletableSource}s
* have completed or failed with an error.
* </dd>
* </dl>
* @param sources the iterable sequence of sources.
* @return the new Completable instance
* @throws NullPointerException if sources is null
* @see #mergeArrayDelayError(CompletableSource...)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable mergeArray(CompletableSource... sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
if (sources.length == 0) {
return complete();
} else
if (sources.length == 1) {
return wrap(sources[0]);
}
return RxJavaPlugins.onAssembly(new CompletableMergeArray(sources));
}
/**
* Returns a Completable instance that subscribes to all sources at once and
* completes only when all source Completables complete or one of them emits an error.
* <p>
* <img width="640" height="311" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.merge.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* <dt><b>Error handling:</b></dt>
* <dd>If any of the source {@code CompletableSource}s signal a {@code Throwable} via {@code onError}, the resulting
* {@code Completable} terminates with that {@code Throwable} and all other source {@code CompletableSource}s are cancelled.
* If more than one {@code CompletableSource} signals an error, the resulting {@code Completable} may terminate with the
* first one's error or, depending on the concurrency of the sources, may terminate with a
* {@code CompositeException} containing two or more of the various error signals.
* {@code Throwable}s that didn't make into the composite will be sent (individually) to the global error handler via
* {@link RxJavaPlugins#onError(Throwable)} method as {@code UndeliverableException} errors. Similarly, {@code Throwable}s
* signaled by source(s) after the returned {@code Completable} has been cancelled or terminated with a
* (composite) error will be sent to the same global error handler.
* Use {@link #mergeDelayError(Iterable)} to merge sources and terminate only when all source {@code CompletableSource}s
* have completed or failed with an error.
* </dd>
* </dl>
* @param sources the iterable sequence of sources.
* @return the new Completable instance
* @throws NullPointerException if sources is null
* @see #mergeDelayError(Iterable)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable merge(Iterable<? extends CompletableSource> sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new CompletableMergeIterable(sources));
}
/**
* Returns a Completable instance that subscribes to all sources at once and
* completes only when all source Completables complete or one of them emits an error.
* <p>
* <img width="640" height="336" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.merge.p.png" alt="">
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The returned {@code Completable} honors the backpressure of the downstream consumer
* and expects the other {@code Publisher} to honor it as well.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* <dt><b>Error handling:</b></dt>
* <dd>If any of the source {@code CompletableSource}s signal a {@code Throwable} via {@code onError}, the resulting
* {@code Completable} terminates with that {@code Throwable} and all other source {@code CompletableSource}s are cancelled.
* If more than one {@code CompletableSource} signals an error, the resulting {@code Completable} may terminate with the
* first one's error or, depending on the concurrency of the sources, may terminate with a
* {@code CompositeException} containing two or more of the various error signals.
* {@code Throwable}s that didn't make into the composite will be sent (individually) to the global error handler via
* {@link RxJavaPlugins#onError(Throwable)} method as {@code UndeliverableException} errors. Similarly, {@code Throwable}s
* signaled by source(s) after the returned {@code Completable} has been cancelled or terminated with a
* (composite) error will be sent to the same global error handler.
* Use {@link #mergeDelayError(Publisher)} to merge sources and terminate only when all source {@code CompletableSource}s
* have completed or failed with an error.
* </dd>
* </dl>
* @param sources the iterable sequence of sources.
* @return the new Completable instance
* @throws NullPointerException if sources is null
* @see #mergeDelayError(Publisher)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
public static Completable merge(Publisher<? extends CompletableSource> sources) {
return merge0(sources, Integer.MAX_VALUE, false);
}
/**
* Returns a Completable instance that keeps subscriptions to a limited number of sources at once and
* completes only when all source Completables complete or one of them emits an error.
* <p>
* <img width="640" height="269" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.merge.pn.png" alt="">
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The returned {@code Completable} honors the backpressure of the downstream consumer
* and expects the other {@code Publisher} to honor it as well.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* <dt><b>Error handling:</b></dt>
* <dd>If any of the source {@code CompletableSource}s signal a {@code Throwable} via {@code onError}, the resulting
* {@code Completable} terminates with that {@code Throwable} and all other source {@code CompletableSource}s are cancelled.
* If more than one {@code CompletableSource} signals an error, the resulting {@code Completable} may terminate with the
* first one's error or, depending on the concurrency of the sources, may terminate with a
* {@code CompositeException} containing two or more of the various error signals.
* {@code Throwable}s that didn't make into the composite will be sent (individually) to the global error handler via
* {@link RxJavaPlugins#onError(Throwable)} method as {@code UndeliverableException} errors. Similarly, {@code Throwable}s
* signaled by source(s) after the returned {@code Completable} has been cancelled or terminated with a
* (composite) error will be sent to the same global error handler.
* Use {@link #mergeDelayError(Publisher, int)} to merge sources and terminate only when all source {@code CompletableSource}s
* have completed or failed with an error.
* </dd>
* </dl>
* @param sources the iterable sequence of sources.
* @param maxConcurrency the maximum number of concurrent subscriptions
* @return the new Completable instance
* @throws NullPointerException if sources is null
* @throws IllegalArgumentException if maxConcurrency is less than 1
* @see #mergeDelayError(Publisher, int)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@BackpressureSupport(BackpressureKind.FULL)
public static Completable merge(Publisher<? extends CompletableSource> sources, int maxConcurrency) {
return merge0(sources, maxConcurrency, false);
}
/**
* Returns a Completable instance that keeps subscriptions to a limited number of sources at once and
* completes only when all source Completables terminate in one way or another, combining any exceptions
* thrown by either the sources Observable or the inner Completable instances.
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The returned {@code Flowable} honors the backpressure of the downstream consumer
* and expects the other {@code Publisher} to honor it as well.
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge0} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the iterable sequence of sources.
* @param maxConcurrency the maximum number of concurrent subscriptions
* @param delayErrors delay all errors from the main source and from the inner Completables?
* @return the new Completable instance
* @throws NullPointerException if sources is null
* @throws IllegalArgumentException if maxConcurrency is less than 1
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@BackpressureSupport(BackpressureKind.FULL)
private static Completable merge0(Publisher<? extends CompletableSource> sources, int maxConcurrency, boolean delayErrors) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
return RxJavaPlugins.onAssembly(new CompletableMerge(sources, maxConcurrency, delayErrors));
}
/**
* Returns a CompletableConsumable that subscribes to all Completables in the source array and delays
* any error emitted by either the sources observable or any of the inner Completables until all of
* them terminate in a way or another.
* <p>
* <img width="640" height="430" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.mergeArrayDelayError.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeArrayDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the array of Completables
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable mergeArrayDelayError(CompletableSource... sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new CompletableMergeDelayErrorArray(sources));
}
/**
* Returns a Completable that subscribes to all Completables in the source sequence and delays
* any error emitted by either the sources observable or any of the inner Completables until all of
* them terminate in a way or another.
* <p>
* <img width="640" height="475" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.mergeDelayError.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the sequence of Completables
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable mergeDelayError(Iterable<? extends CompletableSource> sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new CompletableMergeDelayErrorIterable(sources));
}
/**
* Returns a Completable that subscribes to all Completables in the source sequence and delays
* any error emitted by either the sources observable or any of the inner Completables until all of
* them terminate in a way or another.
* <p>
* <img width="640" height="466" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.mergeDelayError.p.png" alt="">
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The returned {@code Completable} honors the backpressure of the downstream consumer
* and expects the other {@code Publisher} to honor it as well.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the sequence of Completables
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
public static Completable mergeDelayError(Publisher<? extends CompletableSource> sources) {
return merge0(sources, Integer.MAX_VALUE, true);
}
/**
* Returns a Completable that subscribes to a limited number of inner Completables at once in
* the source sequence and delays any error emitted by either the sources
* observable or any of the inner Completables until all of
* them terminate in a way or another.
* <p>
* <img width="640" height="440" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.mergeDelayError.pn.png" alt="">
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The returned {@code Completable} honors the backpressure of the downstream consumer
* and expects the other {@code Publisher} to honor it as well.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the sequence of Completables
* @param maxConcurrency the maximum number of concurrent subscriptions to Completables
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@BackpressureSupport(BackpressureKind.FULL)
public static Completable mergeDelayError(Publisher<? extends CompletableSource> sources, int maxConcurrency) {
return merge0(sources, maxConcurrency, true);
}
/**
* Returns a Completable that never calls onError or onComplete.
* <p>
* <img width="640" height="512" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.never.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code never} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @return the singleton instance that never calls onError or onComplete
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable never() {
return RxJavaPlugins.onAssembly(CompletableNever.INSTANCE);
}
/**
* Returns a Completable instance that fires its onComplete event after the given delay elapsed.
* <p>
* <img width="640" height="413" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.timer.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code timer} does operate by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
* @param delay the delay time
* @param unit the delay unit
* @return the new Completable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public static Completable timer(long delay, TimeUnit unit) {
return timer(delay, unit, Schedulers.computation());
}
/**
* Returns a Completable instance that fires its onComplete event after the given delay elapsed
* by using the supplied scheduler.
* <p>
* <img width="640" height="413" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.timer.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code timer} operates on the {@link Scheduler} you specify.</dd>
* </dl>
* @param delay the delay time
* @param unit the delay unit
* @param scheduler the scheduler where to emit the complete event
* @return the new Completable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public static Completable timer(final long delay, final TimeUnit unit, final Scheduler scheduler) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new CompletableTimer(delay, unit, scheduler));
}
/**
* Creates a NullPointerException instance and sets the given Throwable as its initial cause.
* @param ex the Throwable instance to use as cause, not null (not verified)
* @return the created NullPointerException
*/
private static NullPointerException toNpe(Throwable ex) {
NullPointerException npe = new NullPointerException("Actually not, but can't pass out an exception otherwise...");
npe.initCause(ex);
return npe;
}
/**
* Returns a Completable instance which manages a resource along
* with a custom Completable instance while the subscription is active.
* <p>
* <img width="640" height="388" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.using.png" alt="">
* <p>
* This overload disposes eagerly before the terminal event is emitted.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code using} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the resource type
* @param resourceSupplier the supplier that returns a resource to be managed.
* @param completableFunction the function that given a resource returns a Completable instance that will be subscribed to
* @param disposer the consumer that disposes the resource created by the resource supplier
* @return the new Completable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <R> Completable using(Callable<R> resourceSupplier,
Function<? super R, ? extends CompletableSource> completableFunction,
Consumer<? super R> disposer) {
return using(resourceSupplier, completableFunction, disposer, true);
}
/**
* Returns a Completable instance which manages a resource along
* with a custom Completable instance while the subscription is active and performs eager or lazy
* resource disposition.
* <p>
* <img width="640" height="332" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.using.b.png" alt="">
* <p>
* If this overload performs a lazy cancellation after the terminal event is emitted.
* Exceptions thrown at this time will be delivered to RxJavaPlugins only.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code using} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the resource type
* @param resourceSupplier the supplier that returns a resource to be managed
* @param completableFunction the function that given a resource returns a non-null
* Completable instance that will be subscribed to
* @param disposer the consumer that disposes the resource created by the resource supplier
* @param eager if true, the resource is disposed before the terminal event is emitted, if false, the
* resource is disposed after the terminal event has been emitted
* @return the new Completable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <R> Completable using(
final Callable<R> resourceSupplier,
final Function<? super R, ? extends CompletableSource> completableFunction,
final Consumer<? super R> disposer,
final boolean eager) {
ObjectHelper.requireNonNull(resourceSupplier, "resourceSupplier is null");
ObjectHelper.requireNonNull(completableFunction, "completableFunction is null");
ObjectHelper.requireNonNull(disposer, "disposer is null");
return RxJavaPlugins.onAssembly(new CompletableUsing<R>(resourceSupplier, completableFunction, disposer, eager));
}
/**
* Wraps the given CompletableSource into a Completable
* if not already Completable.
* <p>
* <img width="640" height="354" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.wrap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code wrap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param source the source to wrap
* @return the source or its wrapper Completable
* @throws NullPointerException if source is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Completable wrap(CompletableSource source) {
ObjectHelper.requireNonNull(source, "source is null");
if (source instanceof Completable) {
return RxJavaPlugins.onAssembly((Completable)source);
}
return RxJavaPlugins.onAssembly(new CompletableFromUnsafeSource(source));
}
/**
* Returns a Completable that emits the a terminated event of either this Completable
* or the other Completable whichever fires first.
* <p>
* <img width="640" height="484" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Completable.ambWith.png" alt="">
* <dl>