src/main/java/rx/Completable.java
/**
* Copyright 2014 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;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicBoolean;
import rx.exceptions.*;
import rx.functions.*;
import rx.internal.observers.AssertableSubscriberObservable;
import rx.internal.operators.*;
import rx.internal.util.*;
import rx.observers.*;
import rx.plugins.RxJavaHooks;
import rx.schedulers.Schedulers;
import rx.subscriptions.*;
/**
* Represents a deferred computation without any value but only indication for completion or exception.
*
* The class follows a similar event pattern as Reactive-Streams: onSubscribe (onError|onComplete)?
*
* @since 1.3
*/
public class Completable {
/** The actual subscription action. */
private final OnSubscribe onSubscribe;
/**
* Callback used for building deferred computations that takes a CompletableSubscriber.
*/
public interface OnSubscribe extends Action1<rx.CompletableSubscriber> {
}
/**
* Convenience interface and callback used by the lift operator that given a child CompletableSubscriber,
* return a parent CompletableSubscriber that does any kind of lifecycle-related transformations.
*/
public interface Operator extends Func1<rx.CompletableSubscriber, rx.CompletableSubscriber> {
}
/**
* Convenience interface and callback used by the compose operator to turn a Completable into another
* Completable fluently.
*/
public interface Transformer extends Func1<Completable, Completable> {
}
/** Single instance of a complete Completable. */
static final Completable COMPLETE = new Completable(new OnSubscribe() {
@Override
public void call(rx.CompletableSubscriber s) {
s.onSubscribe(Subscriptions.unsubscribed());
s.onCompleted();
}
}, false); // hook is handled in complete()
/** Single instance of a never Completable. */
static final Completable NEVER = new Completable(new OnSubscribe() {
@Override
public void call(rx.CompletableSubscriber s) {
s.onSubscribe(Subscriptions.unsubscribed());
}
}, false); // hook is handled in never()
/**
* Returns a Completable which terminates as soon as one of the source Completables
* terminates (normally or with an error) and cancels all other Completables.
* @param sources the array of source Completables
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
public static Completable amb(final Completable... sources) {
requireNonNull(sources);
if (sources.length == 0) {
return complete();
}
if (sources.length == 1) {
return sources[0];
}
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
final CompositeSubscription set = new CompositeSubscription();
s.onSubscribe(set);
final AtomicBoolean once = new AtomicBoolean();
rx.CompletableSubscriber inner = new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
if (once.compareAndSet(false, true)) {
set.unsubscribe();
s.onCompleted();
}
}
@Override
public void onError(Throwable e) {
if (once.compareAndSet(false, true)) {
set.unsubscribe();
s.onError(e);
} else {
RxJavaHooks.onError(e);
}
}
@Override
public void onSubscribe(Subscription d) {
set.add(d);
}
};
for (Completable c : sources) {
if (set.isUnsubscribed()) {
return;
}
if (c == null) {
NullPointerException npe = new NullPointerException("One of the sources is null");
if (once.compareAndSet(false, true)) {
set.unsubscribe();
s.onError(npe);
} else {
RxJavaHooks.onError(npe);
}
return;
}
if (once.get() || set.isUnsubscribed()) {
return;
}
// no need to have separate subscribers because inner is stateless
c.unsafeSubscribe(inner);
}
}
});
}
/**
* Returns a Completable which terminates as soon as one of the source Completables
* terminates (normally or with an error) and cancels all other Completables.
* @param sources the array of source Completables
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
public static Completable amb(final Iterable<? extends Completable> sources) {
requireNonNull(sources);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
final CompositeSubscription set = new CompositeSubscription();
s.onSubscribe(set);
Iterator<? extends Completable> it;
try {
it = sources.iterator();
} catch (Throwable e) {
s.onError(e);
return;
}
if (it == null) {
s.onError(new NullPointerException("The iterator returned is null"));
return;
}
boolean empty = true;
final AtomicBoolean once = new AtomicBoolean();
rx.CompletableSubscriber inner = new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
if (once.compareAndSet(false, true)) {
set.unsubscribe();
s.onCompleted();
}
}
@Override
public void onError(Throwable e) {
if (once.compareAndSet(false, true)) {
set.unsubscribe();
s.onError(e);
} else {
RxJavaHooks.onError(e);
}
}
@Override
public void onSubscribe(Subscription d) {
set.add(d);
}
};
for (;;) {
if (once.get() || set.isUnsubscribed()) {
return;
}
boolean b;
try {
b = it.hasNext();
} catch (Throwable e) {
if (once.compareAndSet(false, true)) {
set.unsubscribe();
s.onError(e);
} else {
RxJavaHooks.onError(e);
}
return;
}
if (!b) {
if (empty) {
s.onCompleted();
}
break;
}
empty = false;
if (once.get() || set.isUnsubscribed()) {
return;
}
Completable c;
try {
c = it.next();
} catch (Throwable e) {
if (once.compareAndSet(false, true)) {
set.unsubscribe();
s.onError(e);
} else {
RxJavaHooks.onError(e);
}
return;
}
if (c == null) {
NullPointerException npe = new NullPointerException("One of the sources is null");
if (once.compareAndSet(false, true)) {
set.unsubscribe();
s.onError(npe);
} else {
RxJavaHooks.onError(npe);
}
return;
}
if (once.get() || set.isUnsubscribed()) {
return;
}
// no need to have separate subscribers because inner is stateless
c.unsafeSubscribe(inner);
}
}
});
}
/**
* Returns a Completable instance that completes immediately when subscribed to.
* @return a Completable instance that completes immediately
*/
public static Completable complete() {
OnSubscribe cos = RxJavaHooks.onCreate(COMPLETE.onSubscribe);
if (cos == COMPLETE.onSubscribe) {
return COMPLETE;
}
return new Completable(cos, false);
}
/**
* Returns a Completable which completes only when all sources complete, one after another.
* @param sources the sources to concatenate
* @return the Completable instance which completes only when all sources complete
* @throws NullPointerException if sources is null
*/
public static Completable concat(Completable... sources) {
requireNonNull(sources);
if (sources.length == 0) {
return complete();
} else
if (sources.length == 1) {
return sources[0];
}
return create(new CompletableOnSubscribeConcatArray(sources));
}
/**
* Returns a Completable which completes only when all sources complete, one after another.
* @param sources the sources to concatenate
* @return the Completable instance which completes only when all sources complete
* @throws NullPointerException if sources is null
*/
public static Completable concat(Iterable<? extends Completable> sources) {
requireNonNull(sources);
return create(new CompletableOnSubscribeConcatIterable(sources));
}
/**
* Returns a Completable which completes only when all sources complete, one after another.
* @param sources the sources to concatenate
* @return the Completable instance which completes only when all sources complete
* @throws NullPointerException if sources is null
*/
public static Completable concat(Observable<? extends Completable> sources) {
return concat(sources, 2);
}
/**
* Returns a Completable which completes only when all sources complete, one after another.
* @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
*/
public static Completable concat(Observable<? extends Completable> sources, int prefetch) {
requireNonNull(sources);
if (prefetch < 1) {
throw new IllegalArgumentException("prefetch > 0 required but it was " + prefetch);
}
return create(new CompletableOnSubscribeConcat(sources, prefetch));
}
/**
* Constructs a Completable instance by wrapping the given onSubscribe callback.
* @param onSubscribe the callback which will receive the CompletableSubscriber instances
* when the Completable is subscribed to.
* @return the created Completable instance
* @throws NullPointerException if onSubscribe is null
*/
public static Completable create(OnSubscribe onSubscribe) {
requireNonNull(onSubscribe);
try {
return new Completable(onSubscribe);
} catch (NullPointerException ex) { // NOPMD
throw ex;
} catch (Throwable ex) {
RxJavaHooks.onError(ex);
throw toNpe(ex);
}
}
/**
* Defers the subscription to a Completable instance returned by a supplier.
* @param completableFunc0 the supplier that returns the Completable that will be subscribed to.
* @return the Completable instance
*/
public static Completable defer(final Func0<? extends Completable> completableFunc0) {
requireNonNull(completableFunc0);
return create(new OnSubscribe() {
@Override
public void call(rx.CompletableSubscriber s) {
Completable c;
try {
c = completableFunc0.call();
} catch (Throwable e) {
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(e);
return;
}
if (c == null) {
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(new NullPointerException("The completable returned is null"));
return;
}
c.unsafeSubscribe(s);
}
});
}
/**
* Creates a Completable which calls the given error supplier for each subscriber
* and emits its returned Throwable.
* <p>
* If the errorFunc0 returns null, the child CompletableSubscribers will receive a
* NullPointerException.
* @param errorFunc0 the error supplier, not null
* @return the new Completable instance
* @throws NullPointerException if errorFunc0 is null
*/
public static Completable error(final Func0<? extends Throwable> errorFunc0) {
requireNonNull(errorFunc0);
return create(new OnSubscribe() {
@Override
public void call(rx.CompletableSubscriber s) {
s.onSubscribe(Subscriptions.unsubscribed());
Throwable error;
try {
error = errorFunc0.call();
} catch (Throwable e) {
error = e;
}
if (error == null) {
error = new NullPointerException("The error supplied is null");
}
s.onError(error);
}
});
}
/**
* Creates a Completable instance that emits the given Throwable exception to subscribers.
* @param error the Throwable instance to emit, not null
* @return the new Completable instance
* @throws NullPointerException if error is null
*/
public static Completable error(final Throwable error) {
requireNonNull(error);
return create(new OnSubscribe() {
@Override
public void call(rx.CompletableSubscriber s) {
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(error);
}
});
}
/**
* Returns a Completable instance that runs the given Action0 for each subscriber and
* emits either an unchecked exception or simply completes.
* @param action the Action0 to run for each subscriber
* @return the new Completable instance
* @throws NullPointerException if run is null
*/
public static Completable fromAction(final Action0 action) {
requireNonNull(action);
return create(new OnSubscribe() {
@Override
public void call(rx.CompletableSubscriber s) {
BooleanSubscription bs = new BooleanSubscription();
s.onSubscribe(bs);
try {
action.call();
} catch (Throwable e) {
if (!bs.isUnsubscribed()) {
s.onError(e);
}
return;
}
if (!bs.isUnsubscribed()) {
s.onCompleted();
}
}
});
}
/**
* Returns a Completable which when subscribed, executes the callable function, ignores its
* normal result and emits onError or onCompleted only.
* @param callable the callable instance to execute for each subscriber
* @return the new Completable instance
*/
public static Completable fromCallable(final Callable<?> callable) {
requireNonNull(callable);
return create(new OnSubscribe() {
@Override
public void call(rx.CompletableSubscriber s) {
BooleanSubscription bs = new BooleanSubscription();
s.onSubscribe(bs);
try {
callable.call();
} catch (Throwable e) {
if (!bs.isUnsubscribed()) {
s.onError(e);
}
return;
}
if (!bs.isUnsubscribed()) {
s.onCompleted();
}
}
});
}
/**
* Provides an API (in a cold Completable) that bridges the Completable-reactive world
* with the callback-based world.
* <p>The {@link CompletableEmitter} allows registering a callback for
* cancellation/unsubscription of a resource.
* <p>
* Example:
* <pre><code>
* Completable.fromEmitter(emitter -> {
* Callback listener = new Callback() {
* @Override
* public void onEvent(Event e) {
* emitter.onCompleted();
* }
*
* @Override
* public void onFailure(Exception e) {
* emitter.onError(e);
* }
* };
*
* AutoCloseable c = api.someMethod(listener);
*
* emitter.setCancellation(c::close);
*
* });
* </code></pre>
* <p>All of the CompletableEmitter's methods are thread-safe and ensure the
* Completable's protocol are held.
* @param producer the callback invoked for each incoming CompletableSubscriber
* @return the new Completable instance
* @since 1.3
*/
public static Completable fromEmitter(Action1<CompletableEmitter> producer) {
return create(new CompletableFromEmitter(producer));
}
/**
* Returns a Completable instance that reacts to the termination of the given Future in a blocking fashion.
* <p>
* Note that cancellation from any of the subscribers to this Completable will cancel the future.
* @param future the future to react to
* @return the new Completable instance
*/
public static Completable fromFuture(Future<?> future) {
requireNonNull(future);
return fromObservable(Observable.from(future));
}
/**
* Returns a Completable instance that subscribes to the given flowable, ignores all values and
* emits only the terminal event.
* @param flowable the Flowable instance to subscribe to, not null
* @return the new Completable instance
* @throws NullPointerException if flowable is null
*/
public static Completable fromObservable(final Observable<?> flowable) {
requireNonNull(flowable);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber cs) {
Subscriber<Object> subscriber = new Subscriber<Object>() {
@Override
public void onCompleted() {
cs.onCompleted();
}
@Override
public void onError(Throwable t) {
cs.onError(t);
}
@Override
public void onNext(Object t) {
// ignored
}
};
cs.onSubscribe(subscriber);
flowable.unsafeSubscribe(subscriber);
}
});
}
/**
* 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.
* @param single the Single instance to subscribe to, not null
* @return the new Completable instance
* @throws NullPointerException if single is null
*/
public static Completable fromSingle(final Single<?> single) {
requireNonNull(single);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
SingleSubscriber<Object> te = new SingleSubscriber<Object>() {
@Override
public void onError(Throwable e) {
s.onError(e);
}
@Override
public void onSuccess(Object value) {
s.onCompleted();
}
};
s.onSubscribe(te);
single.subscribe(te);
}
});
}
/**
* 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.
* @param sources the iterable sequence of sources.
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
public static Completable merge(Completable... sources) {
requireNonNull(sources);
if (sources.length == 0) {
return complete();
} else
if (sources.length == 1) {
return sources[0];
}
return create(new CompletableOnSubscribeMergeArray(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.
* @param sources the iterable sequence of sources.
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
public static Completable merge(Iterable<? extends Completable> sources) {
requireNonNull(sources);
return create(new CompletableOnSubscribeMergeIterable(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.
* @param sources the iterable sequence of sources.
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
public static Completable merge(Observable<? extends Completable> 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.
* @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
*/
public static Completable merge(Observable<? extends Completable> 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.
* @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
*/
protected static Completable merge0(Observable<? extends Completable> sources, int maxConcurrency, boolean delayErrors) {
requireNonNull(sources);
if (maxConcurrency < 1) {
throw new IllegalArgumentException("maxConcurrency > 0 required but it was " + maxConcurrency);
}
return create(new CompletableOnSubscribeMerge(sources, maxConcurrency, delayErrors));
}
/**
* Returns a Completable 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.
* @param sources the array of Completables
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
public static Completable mergeDelayError(Completable... sources) {
requireNonNull(sources);
return create(new CompletableOnSubscribeMergeDelayErrorArray(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.
* @param sources the sequence of Completables
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
public static Completable mergeDelayError(Iterable<? extends Completable> sources) {
requireNonNull(sources);
return create(new CompletableOnSubscribeMergeDelayErrorIterable(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.
* @param sources the sequence of Completables
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
public static Completable mergeDelayError(Observable<? extends Completable> 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.
* @param sources the sequence of Completables
* @param maxConcurrency the maximum number of simultaneous subscriptions to the source Completables.
* @return the new Completable instance
* @throws NullPointerException if sources is null
*/
public static Completable mergeDelayError(Observable<? extends Completable> sources, int maxConcurrency) {
return merge0(sources, maxConcurrency, true);
}
/**
* Returns a Completable that never calls onError or onComplete.
* @return the singleton instance that never calls onError or onComplete
*/
public static Completable never() {
OnSubscribe cos = RxJavaHooks.onCreate(NEVER.onSubscribe);
if (cos == NEVER.onSubscribe) {
return NEVER;
}
return new Completable(cos, false);
}
/**
* Java 7 backport: throws a NullPointerException if o is null.
* @param o the object to check
* @return the o value
* @throws NullPointerException if o is null
*/
static <T> T requireNonNull(T o) {
if (o == null) {
throw new NullPointerException();
}
return o;
}
/**
* Returns a Completable instance that fires its onComplete event after the given delay elapsed.
* @param delay the delay time
* @param unit the delay unit
* @return the new Completable instance
*/
public static Completable timer(long delay, TimeUnit unit) {
return timer(delay, unit, Schedulers.computation());
}
/**
* Returns a Completable instance that fires its onCompleted event after the given delay elapsed
* by using the supplied scheduler.
* @param delay the delay time
* @param unit the delay unit
* @param scheduler the scheduler to use to emit the onCompleted event
* @return the new Completable instance
*/
public static Completable timer(final long delay, final TimeUnit unit, final Scheduler scheduler) {
requireNonNull(unit);
requireNonNull(scheduler);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
MultipleAssignmentSubscription mad = new MultipleAssignmentSubscription();
s.onSubscribe(mad);
if (!mad.isUnsubscribed()) {
final Scheduler.Worker w = scheduler.createWorker();
mad.set(w);
w.schedule(new Action0() {
@Override
public void call() {
try {
s.onCompleted();
} finally {
w.unsubscribe();
}
}
}, delay, unit);
}
}
});
}
/**
* 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
*/
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>
* This overload performs an eager unsubscription before the terminal event is emitted.
*
* @param <R> the resource type
* @param resourceFunc0 the supplier that returns a resource to be managed.
* @param completableFunc1 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
*/
public static <R> Completable using(Func0<R> resourceFunc0,
Func1<? super R, ? extends Completable> completableFunc1,
Action1<? super R> disposer) {
return using(resourceFunc0, completableFunc1, 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>
* If this overload performs a lazy unsubscription after the terminal event is emitted.
* Exceptions thrown at this time will be delivered to RxJavaPlugins only.
*
* @param <R> the resource type
* @param resourceFunc0 the supplier that returns a resource to be managed
* @param completableFunc1 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
*/
public static <R> Completable using(final Func0<R> resourceFunc0,
final Func1<? super R, ? extends Completable> completableFunc1,
final Action1<? super R> disposer,
final boolean eager) {
requireNonNull(resourceFunc0);
requireNonNull(completableFunc1);
requireNonNull(disposer);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
final R resource; // NOPMD
try {
resource = resourceFunc0.call();
} catch (Throwable e) {
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(e);
return;
}
Completable cs;
try {
cs = completableFunc1.call(resource);
} catch (Throwable e) {
try {
disposer.call(resource);
} catch (Throwable ex) {
Exceptions.throwIfFatal(e);
Exceptions.throwIfFatal(ex);
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(new CompositeException(Arrays.asList(e, ex)));
return;
}
Exceptions.throwIfFatal(e);
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(e);
return;
}
if (cs == null) {
try {
disposer.call(resource);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(new CompositeException(Arrays.asList(new NullPointerException("The completable supplied is null"), ex)));
return;
}
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(new NullPointerException("The completable supplied is null"));
return;
}
final AtomicBoolean once = new AtomicBoolean();
cs.unsafeSubscribe(new rx.CompletableSubscriber() {
Subscription d;
void dispose() {
d.unsubscribe();
if (once.compareAndSet(false, true)) {
try {
disposer.call(resource);
} catch (Throwable ex) {
RxJavaHooks.onError(ex);
}
}
}
@Override
public void onCompleted() {
if (eager) {
if (once.compareAndSet(false, true)) {
try {
disposer.call(resource);
} catch (Throwable ex) {
s.onError(ex);
return;
}
}
}
s.onCompleted();
if (!eager) {
dispose();
}
}
@Override
public void onError(Throwable e) {
if (eager) {
if (once.compareAndSet(false, true)) {
try {
disposer.call(resource);
} catch (Throwable ex) {
e = new CompositeException(Arrays.asList(e, ex));
}
}
}
s.onError(e);
if (!eager) {
dispose();
}
}
@Override
public void onSubscribe(Subscription d) {
this.d = d;
s.onSubscribe(Subscriptions.create(new Action0() {
@Override
public void call() {
dispose();
}
}));
}
});
}
});
}
/**
* Constructs a Completable instance with the given onSubscribe callback.
* @param onSubscribe the callback that will receive CompletableSubscribers when they subscribe,
* not null (not verified)
*/
protected Completable(OnSubscribe onSubscribe) {
this.onSubscribe = RxJavaHooks.onCreate(onSubscribe);
}
/**
* Constructs a Completable instance with the given onSubscribe callback without calling the onCreate
* hook.
* @param onSubscribe the callback that will receive CompletableSubscribers when they subscribe,
* not null (not verified)
* @param useHook if false, RxJavaHooks.onCreate won't be called
*/
protected Completable(OnSubscribe onSubscribe, boolean useHook) {
this.onSubscribe = useHook ? RxJavaHooks.onCreate(onSubscribe) : onSubscribe;
}
/**
* Returns a Completable that emits the a terminated event of either this Completable
* or the other Completable whichever fires first.
* @param other the other Completable, not null
* @return the new Completable instance
* @throws NullPointerException if other is null
*/
public final Completable ambWith(Completable other) {
requireNonNull(other);
return amb(this, other);
}
/**
* Subscribes to and awaits the termination of this Completable instance in a blocking manner and
* rethrows any exception emitted.
* @throws RuntimeException wrapping an InterruptedException if the current thread is interrupted
*/
public final void await() {
final CountDownLatch cdl = new CountDownLatch(1);
final Throwable[] err = new Throwable[1];
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
cdl.countDown();
}
@Override
public void onError(Throwable e) {
err[0] = e;
cdl.countDown();
}
@Override
public void onSubscribe(Subscription d) {
// ignored
}
});
if (cdl.getCount() == 0) {
if (err[0] != null) {
Exceptions.propagate(err[0]);
}
return;
}
try {
cdl.await();
} catch (InterruptedException ex) {
throw Exceptions.propagate(ex);
}
if (err[0] != null) {
Exceptions.propagate(err[0]);
}
}
/**
* Subscribes to and awaits the termination of this Completable instance in a blocking manner
* with a specific timeout and rethrows any exception emitted within the timeout window.
* @param timeout the timeout value
* @param unit the timeout unit
* @return true if the this Completable instance completed normally within the time limit,
* false if the timeout elapsed before this Completable terminated.
* @throws RuntimeException wrapping an InterruptedException if the current thread is interrupted
*/
public final boolean await(long timeout, TimeUnit unit) {
requireNonNull(unit);
final CountDownLatch cdl = new CountDownLatch(1);
final Throwable[] err = new Throwable[1];
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
cdl.countDown();
}
@Override
public void onError(Throwable e) {
err[0] = e;
cdl.countDown();
}
@Override
public void onSubscribe(Subscription d) {
// ignored
}
});
if (cdl.getCount() == 0) {
if (err[0] != null) {
Exceptions.propagate(err[0]);
}
return true;
}
boolean b;
try {
b = cdl.await(timeout, unit);
} catch (InterruptedException ex) {
throw Exceptions.propagate(ex);
}
if (b) {
if (err[0] != null) {
Exceptions.propagate(err[0]);
}
}
return b;
}
/**
* Calls the given transformer function with this instance and returns the function's resulting
* Completable.
* @param transformer the transformer function, not null
* @return the Completable returned by the function
* @throws NullPointerException if transformer is null
*/
public final Completable compose(Transformer transformer) {
return to(transformer);
}
/**
* Returns an Observable which will subscribe to this Completable and once that is completed then
* will subscribe to the {@code next} Observable. An error event from this Completable will be
* propagated to the downstream subscriber and will result in skipping the subscription of the
* Observable.
*
* @param <T> the value type of the next Observable
* @param next the Observable to subscribe after this Completable is completed, not null
* @return Observable that composes this Completable and next
* @throws NullPointerException if next is null
*/
public final <T> Observable<T> andThen(Observable<T> next) {
requireNonNull(next);
return next.delaySubscription(toObservable());
}
/**
* Returns a Single which will subscribe to this Completable and once that is completed then
* will subscribe to the {@code next} Single. An error event from this Completable will be
* propagated to the downstream subscriber and will result in skipping the subscription of the
* Single.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code andThen} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the value type of the next Single
* @param next the Single to subscribe after this Completable is completed, not null
* @return Single that composes this Completable and next
*/
public final <T> Single<T> andThen(Single<T> next) {
requireNonNull(next);
return next.delaySubscription(toObservable());
}
/**
* Returns a completable that first runs this Completable
* and then the other completable.
* <p>
* This is an alias for {@link #concatWith(Completable)}.
* @param next the other Completable, not null
* @return the new Completable instance
* @throws NullPointerException if other is null
*/
public final Completable andThen(Completable next) {
return concatWith(next);
}
/**
* Concatenates this Completable with another Completable.
* @param other the other Completable, not null
* @return the new Completable which subscribes to this and then the other Completable
* @throws NullPointerException if other is null
*/
public final Completable concatWith(Completable other) {
requireNonNull(other);
return concat(this, other);
}
/**
* Returns a Completable which delays the emission of the completion event by the given time.
* @param delay the delay time
* @param unit the delay unit
* @return the new Completable instance
* @throws NullPointerException if unit is null
*/
public final Completable delay(long delay, TimeUnit unit) {
return delay(delay, unit, Schedulers.computation(), false);
}
/**
* Returns a Completable which delays the emission of the completion event by the given time while
* running on the specified scheduler.
* @param delay the delay time
* @param unit the delay unit
* @param scheduler the scheduler to run the delayed completion on
* @return the new Completable instance
* @throws NullPointerException if unit or scheduler is null
*/
public final Completable delay(long delay, TimeUnit unit, Scheduler scheduler) {
return delay(delay, unit, scheduler, false);
}
/**
* Returns a Completable which delays the emission of the completion event, and optionally the error as well, by the given time while
* running on the specified scheduler.
* @param delay the delay time
* @param unit the delay unit
* @param scheduler the scheduler to run the delayed completion on
* @param delayError delay the error emission as well?
* @return the new Completable instance
* @throws NullPointerException if unit or scheduler is null
*/
public final Completable delay(final long delay, final TimeUnit unit, final Scheduler scheduler, final boolean delayError) {
requireNonNull(unit);
requireNonNull(scheduler);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
final CompositeSubscription set = new CompositeSubscription();
final Scheduler.Worker w = scheduler.createWorker();
set.add(w);
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
set.add(w.schedule(new Action0() {
@Override
public void call() {
try {
s.onCompleted();
} finally {
w.unsubscribe();
}
}
}, delay, unit));
}
@Override
public void onError(final Throwable e) {
if (delayError) {
set.add(w.schedule(new Action0() {
@Override
public void call() {
try {
s.onError(e);
} finally {
w.unsubscribe();
}
}
}, delay, unit));
} else {
s.onError(e);
}
}
@Override
public void onSubscribe(Subscription d) {
set.add(d);
s.onSubscribe(set);
}
});
}
});
}
/**
* Returns a Completable which calls the given onCompleted callback if this Completable completes.
* @param onCompleted the callback to call when this emits an onComplete event
* @return the new Completable instance
* @throws NullPointerException if onComplete is null
*/
public final Completable doOnCompleted(Action0 onCompleted) {
return doOnLifecycle(Actions.empty(), Actions.empty(), onCompleted, Actions.empty(), Actions.empty());
}
/**
* Returns a Completable which calls the given onNotification callback when this Completable emits an error or completes.
* @param onNotification the notification callback
* @return the new Completable instance
* @throws NullPointerException if onNotification is null
*/
public final Completable doOnEach(final Action1<Notification<Object>> onNotification) {
if (onNotification == null) {
throw new IllegalArgumentException("onNotification is null");
}
return doOnLifecycle(Actions.empty(), new Action1<Throwable>() {
@Override
public void call(final Throwable throwable) {
onNotification.call(Notification.createOnError(throwable));
}
}, new Action0() {
@Override
public void call() {
onNotification.call(Notification.createOnCompleted());
}
}, Actions.empty(), Actions.empty());
}
/**
* Returns a Completable which calls the given onUnsubscribe callback if the child subscriber cancels
* the subscription.
* @param onUnsubscribe the callback to call when the child subscriber cancels the subscription
* @return the new Completable instance
* @throws NullPointerException if onDispose is null
*/
public final Completable doOnUnsubscribe(Action0 onUnsubscribe) {
return doOnLifecycle(Actions.empty(), Actions.empty(), Actions.empty(), Actions.empty(), onUnsubscribe);
}
/**
* Returns a Completable which calls the given onError callback if this Completable emits an error.
* @param onError the error callback
* @return the new Completable instance
* @throws NullPointerException if onError is null
*/
public final Completable doOnError(Action1<? super Throwable> onError) {
return doOnLifecycle(Actions.empty(), onError, Actions.empty(), Actions.empty(), Actions.empty());
}
/**
* Returns a Completable instance that calls the various callbacks on the specific
* lifecycle events.
* @param onSubscribe the consumer called when a CompletableSubscriber subscribes.
* @param onError the consumer called when this emits an onError event
* @param onComplete the runnable called just before when this Completable completes normally
* @param onAfterTerminate the runnable called after this Completable terminates
* @param onUnsubscribe the runnable called when the child cancels the subscription
* @return the new Completable instance
*/
protected final Completable doOnLifecycle(
final Action1<? super Subscription> onSubscribe,
final Action1<? super Throwable> onError,
final Action0 onComplete,
final Action0 onAfterTerminate,
final Action0 onUnsubscribe) {
requireNonNull(onSubscribe);
requireNonNull(onError);
requireNonNull(onComplete);
requireNonNull(onAfterTerminate);
requireNonNull(onUnsubscribe);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
try {
onComplete.call();
} catch (Throwable e) {
s.onError(e);
return;
}
s.onCompleted();
try {
onAfterTerminate.call();
} catch (Throwable e) {
RxJavaHooks.onError(e);
}
}
@Override
public void onError(Throwable e) {
try {
onError.call(e);
} catch (Throwable ex) {
e = new CompositeException(Arrays.asList(e, ex));
}
s.onError(e);
try {
onAfterTerminate.call();
} catch (Throwable ex) {
RxJavaHooks.onError(ex);
}
}
@Override
public void onSubscribe(final Subscription d) {
try {
onSubscribe.call(d);
} catch (Throwable ex) {
d.unsubscribe();
s.onSubscribe(Subscriptions.unsubscribed());
s.onError(ex);
return;
}
s.onSubscribe(Subscriptions.create(new Action0() {
@Override
public void call() {
try {
onUnsubscribe.call();
} catch (Throwable e) {
RxJavaHooks.onError(e);
}
d.unsubscribe();
}
}));
}
});
}
});
}
/**
* Returns a Completable instance that calls the given onSubscribe callback with the disposable
* that child subscribers receive on subscription.
* @param onSubscribe the callback called when a child subscriber subscribes
* @return the new Completable instance
* @throws NullPointerException if onSubscribe is null
*/
public final Completable doOnSubscribe(Action1<? super Subscription> onSubscribe) {
return doOnLifecycle(onSubscribe, Actions.empty(), Actions.empty(), Actions.empty(), Actions.empty());
}
/**
* Returns a Completable instance that calls the given onTerminate callback just before this Completable
* completes normally or with an exception
* @param onTerminate the callback to call just before this Completable terminates
* @return the new Completable instance
*/
public final Completable doOnTerminate(final Action0 onTerminate) {
return doOnLifecycle(Actions.empty(), new Action1<Throwable>() {
@Override
public void call(Throwable e) {
onTerminate.call();
}
}, onTerminate, Actions.empty(), Actions.empty());
}
/**
* Returns a Completable instance that calls the given onAfterComplete callback after this
* Completable completes normally.
* @param onAfterTerminate the callback to call after this Completable emits an onCompleted or onError event.
* @return the new Completable instance
* @throws NullPointerException if onAfterComplete is null
*/
public final Completable doAfterTerminate(Action0 onAfterTerminate) {
return doOnLifecycle(Actions.empty(), Actions.empty(), Actions.empty(), onAfterTerminate, Actions.empty());
}
/**
* Subscribes to this Completable instance and blocks until it terminates, then returns null or
* the emitted exception if any.
* @return the throwable if this terminated with an error, null otherwise
* @throws RuntimeException that wraps an InterruptedException if the wait is interrupted
*/
public final Throwable get() {
final CountDownLatch cdl = new CountDownLatch(1);
final Throwable[] err = new Throwable[1];
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
cdl.countDown();
}
@Override
public void onError(Throwable e) {
err[0] = e;
cdl.countDown();
}
@Override
public void onSubscribe(Subscription d) {
// ignored
}
});
if (cdl.getCount() == 0) {
return err[0];
}
try {
cdl.await();
} catch (InterruptedException ex) {
throw Exceptions.propagate(ex);
}
return err[0];
}
/**
* Subscribes to this Completable instance and blocks until it terminates or the specified timeout
* elapses, then returns null for normal termination or the emitted exception if any.
* @param timeout the time amount to wait for the terminal event
* @param unit the time unit of the timeout parameter
* @return the throwable if this terminated with an error, null otherwise
* @throws RuntimeException that wraps an InterruptedException if the wait is interrupted or
* TimeoutException if the specified timeout elapsed before it
*/
public final Throwable get(long timeout, TimeUnit unit) {
requireNonNull(unit);
final CountDownLatch cdl = new CountDownLatch(1);
final Throwable[] err = new Throwable[1];
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
cdl.countDown();
}
@Override
public void onError(Throwable e) {
err[0] = e;
cdl.countDown();
}
@Override
public void onSubscribe(Subscription d) {
// ignored
}
});
if (cdl.getCount() == 0) {
return err[0];
}
boolean b;
try {
b = cdl.await(timeout, unit);
} catch (InterruptedException ex) {
throw Exceptions.propagate(ex);
}
if (b) {
return err[0];
}
Exceptions.propagate(new TimeoutException());
return null;
}
/**
* Lifts a CompletableSubscriber transformation into the chain of Completables.
* @param onLift the lifting function that transforms the child subscriber with a parent subscriber.
* @return the new Completable instance
* @throws NullPointerException if onLift is null
*/
public final Completable lift(final Operator onLift) {
requireNonNull(onLift);
return create(new OnSubscribe() {
@Override
public void call(rx.CompletableSubscriber s) {
try {
Operator onLiftDecorated = RxJavaHooks.onCompletableLift(onLift);
rx.CompletableSubscriber sw = onLiftDecorated.call(s);
unsafeSubscribe(sw);
} catch (NullPointerException ex) { // NOPMD
throw ex;
} catch (Throwable ex) {
throw toNpe(ex);
}
}
});
}
/**
* Returns a Completable which subscribes to this and the other Completable and completes
* when both of them complete or one emits an error.
* @param other the other Completable instance
* @return the new Completable instance
* @throws NullPointerException if other is null
*/
public final Completable mergeWith(Completable other) {
requireNonNull(other);
return merge(this, other);
}
/**
* Returns a Completable which emits the terminal events from the thread of the specified scheduler.
* @param scheduler the scheduler to emit terminal events on
* @return the new Completable instance
* @throws NullPointerException if scheduler is null
*/
public final Completable observeOn(final Scheduler scheduler) {
requireNonNull(scheduler);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
final SubscriptionList ad = new SubscriptionList();
final Scheduler.Worker w = scheduler.createWorker();
ad.add(w);
s.onSubscribe(ad);
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
w.schedule(new Action0() {
@Override
public void call() {
try {
s.onCompleted();
} finally {
ad.unsubscribe();
}
}
});
}
@Override
public void onError(final Throwable e) {
w.schedule(new Action0() {
@Override
public void call() {
try {
s.onError(e);
} finally {
ad.unsubscribe();
}
}
});
}
@Override
public void onSubscribe(Subscription d) {
ad.add(d);
}
});
}
});
}
/**
* Returns a Completable instance that if this Completable emits an error, it will emit an onComplete
* and swallow the throwable.
* @return the new Completable instance
*/
public final Completable onErrorComplete() {
return onErrorComplete(UtilityFunctions.alwaysTrue());
}
/**
* Returns a Completable instance that if this Completable emits an error and the predicate returns
* true, it will emit an onComplete and swallow the throwable.
* @param predicate the predicate to call when a Throwable is emitted which should return true
* if the Throwable should be swallowed and replaced with an onComplete.
* @return the new Completable instance
*/
public final Completable onErrorComplete(final Func1<? super Throwable, Boolean> predicate) {
requireNonNull(predicate);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
s.onCompleted();
}
@Override
public void onError(Throwable e) {
boolean b;
try {
b = predicate.call(e);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
e = new CompositeException(Arrays.asList(e, ex));
b = false;
}
if (b) {
s.onCompleted();
} else {
s.onError(e);
}
}
@Override
public void onSubscribe(Subscription d) {
s.onSubscribe(d);
}
});
}
});
}
/**
* Returns a Completable instance that when encounters an error from this Completable, calls the
* specified mapper function that returns another Completable instance for it and resumes the
* execution with it.
* @param errorMapper the mapper function that takes the error and should return a Completable as
* continuation.
* @return the new Completable instance
*/
public final Completable onErrorResumeNext(final Func1<? super Throwable, ? extends Completable> errorMapper) {
requireNonNull(errorMapper);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
final SerialSubscription sd = new SerialSubscription();
s.onSubscribe(sd);
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
s.onCompleted();
}
@Override
public void onError(Throwable e) {
Completable c;
try {
c = errorMapper.call(e);
} catch (Throwable ex) {
e = new CompositeException(Arrays.asList(e, ex));
s.onError(e);
return;
}
if (c == null) {
NullPointerException npe = new NullPointerException("The completable returned is null");
e = new CompositeException(Arrays.asList(e, npe));
s.onError(e);
return;
}
c.unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
s.onCompleted();
}
@Override
public void onError(Throwable e) {
s.onError(e);
}
@Override
public void onSubscribe(Subscription d) {
sd.set(d);
}
});
}
@Override
public void onSubscribe(Subscription d) {
sd.set(d);
}
});
}
});
}
/**
* Returns a Completable that repeatedly subscribes to this Completable until cancelled.
* @return the new Completable instance
*/
public final Completable repeat() {
return fromObservable(toObservable().repeat());
}
/**
* Returns a Completable that subscribes repeatedly at most the given times to this Completable.
* @param times the number of times the resubscription should happen
* @return the new Completable instance
* @throws IllegalArgumentException if times is less than zero
*/
public final Completable repeat(long times) {
return fromObservable(toObservable().repeat(times));
}
/**
* Returns a Completable instance that repeats when the Publisher returned by the handler
* emits an item or completes when this Publisher emits a completed event.
* @param handler the function that transforms the stream of values indicating the completion of
* this Completable and returns a Publisher that emits items for repeating or completes to indicate the
* repetition should stop
* @return the new Completable instance
* @throws NullPointerException if stop is null
*/
public final Completable repeatWhen(Func1<? super Observable<? extends Void>, ? extends Observable<?>> handler) {
requireNonNull(handler); // FIXME do a null check in Observable
return fromObservable(toObservable().repeatWhen(handler));
}
/**
* Returns a Completable that retries this Completable as long as it emits an onError event.
* @return the new Completable instance
*/
public final Completable retry() {
return fromObservable(toObservable().retry());
}
/**
* Returns a Completable that retries this Completable in case of an error as long as the predicate
* returns true.
* @param predicate the predicate called when this emits an error with the repeat count and the latest exception
* and should return true to retry.
* @return the new Completable instance
*/
public final Completable retry(Func2<Integer, Throwable, Boolean> predicate) {
return fromObservable(toObservable().retry(predicate));
}
/**
* Returns a Completable that when this Completable emits an error, retries at most the given
* number of times before giving up and emitting the last error.
* @param times the number of times the returned Completable should retry this Completable
* @return the new Completable instance
* @throws IllegalArgumentException if times is negative
*/
public final Completable retry(long times) {
return fromObservable(toObservable().retry(times));
}
/**
* Returns a Completable which given a Publisher and when this Completable emits an error, delivers
* that error through an Observable and the Publisher should return a value indicating a retry in response
* or a terminal event indicating a termination.
* @param handler the handler that receives an Observable delivering Throwables and should return a Publisher that
* emits items to indicate retries or emits terminal events to indicate termination.
* @return the new Completable instance
* @throws NullPointerException if handler is null
*/
public final Completable retryWhen(Func1<? super Observable<? extends Throwable>, ? extends Observable<?>> handler) {
return fromObservable(toObservable().retryWhen(handler));
}
/**
* Returns a Completable which first runs the other Completable
* then this completable if the other completed normally.
* @param other the other completable to run first
* @return the new Completable instance
* @throws NullPointerException if other is null
*/
public final Completable startWith(Completable other) {
requireNonNull(other);
return concat(other, this);
}
/**
* Returns an Observable which first delivers the events
* of the other Observable then runs this Completable.
* @param <T> the value type of the starting other Observable
* @param other the other Observable to run first
* @return the new Observable instance
* @throws NullPointerException if other is null
*/
public final <T> Observable<T> startWith(Observable<T> other) {
requireNonNull(other);
return this.<T>toObservable().startWith(other);
}
/**
* Subscribes to this Completable and returns a Subscription which can be used to cancel
* the subscription.
* @return the Subscription that allows cancelling the subscription
*/
public final Subscription subscribe() {
final MultipleAssignmentSubscription mad = new MultipleAssignmentSubscription();
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
mad.unsubscribe();
}
@Override
public void onError(Throwable e) {
RxJavaHooks.onError(e);
mad.unsubscribe();
deliverUncaughtException(e);
}
@Override
public void onSubscribe(Subscription d) {
mad.set(d);
}
});
return mad;
}
/**
* Subscribes to this Completable and calls the given Action0 when this Completable
* completes normally.
* <p>
* If this Completable emits an error, it is sent to RxJavaHooks.onError and gets swallowed.
* @param onComplete the runnable called when this Completable completes normally
* @return the Subscription that allows cancelling the subscription
*/
public final Subscription subscribe(final Action0 onComplete) {
requireNonNull(onComplete);
final MultipleAssignmentSubscription mad = new MultipleAssignmentSubscription();
unsafeSubscribe(new rx.CompletableSubscriber() {
boolean done;
@Override
public void onCompleted() {
if (!done) {
done = true;
try {
onComplete.call();
} catch (Throwable e) {
RxJavaHooks.onError(e);
deliverUncaughtException(e);
} finally {
mad.unsubscribe();
}
}
}
@Override
public void onError(Throwable e) {
RxJavaHooks.onError(e);
mad.unsubscribe();
deliverUncaughtException(e);
}
@Override
public void onSubscribe(Subscription d) {
mad.set(d);
}
});
return mad;
}
/**
* Subscribes to this Completable and calls back either the onError or onComplete functions.
*
* @param onComplete the runnable that is called if the Completable completes normally
* @param onError the consumer that is called if this Completable emits an error
* @return the Subscription that can be used for cancelling the subscription asynchronously
* @throws NullPointerException if either callback is null
*/
public final Subscription subscribe(final Action0 onComplete, final Action1<? super Throwable> onError) {
requireNonNull(onComplete);
requireNonNull(onError);
final MultipleAssignmentSubscription mad = new MultipleAssignmentSubscription();
unsafeSubscribe(new rx.CompletableSubscriber() {
boolean done;
@Override
public void onCompleted() {
if (!done) {
done = true;
try {
onComplete.call();
} catch (Throwable e) {
callOnError(e);
return;
}
mad.unsubscribe();
}
}
@Override
public void onError(Throwable e) {
if (!done) {
done = true;
callOnError(e);
} else {
RxJavaHooks.onError(e);
deliverUncaughtException(e);
}
}
void callOnError(Throwable e) {
try {
onError.call(e);
} catch (Throwable ex) {
e = new CompositeException(Arrays.asList(e, ex));
RxJavaHooks.onError(e);
deliverUncaughtException(e);
} finally {
mad.unsubscribe();
}
}
@Override
public void onSubscribe(Subscription d) {
mad.set(d);
}
});
return mad;
}
static void deliverUncaughtException(Throwable e) {
Thread thread = Thread.currentThread();
thread.getUncaughtExceptionHandler().uncaughtException(thread, e);
}
/**
* Subscribes the given CompletableSubscriber to this Completable instance.
* @param s the CompletableSubscriber, not null
* @throws NullPointerException if s is null
*/
public final void unsafeSubscribe(rx.CompletableSubscriber s) {
requireNonNull(s);
try {
OnSubscribe onSubscribeDecorated = RxJavaHooks.onCompletableStart(this, this.onSubscribe);
onSubscribeDecorated.call(s);
} catch (NullPointerException ex) { // NOPMD
throw ex;
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
ex = RxJavaHooks.onCompletableError(ex);
RxJavaHooks.onError(ex);
throw toNpe(ex);
}
}
/**
* Subscribes the given CompletableSubscriber to this Completable instance
* and handles exceptions thrown by its onXXX methods.
* @param s the CompletableSubscriber, not null
* @throws NullPointerException if s is null
*/
public final void subscribe(rx.CompletableSubscriber s) {
if (!(s instanceof SafeCompletableSubscriber)) {
s = new SafeCompletableSubscriber(s);
}
unsafeSubscribe(s);
}
/**
* Subscribes a regular Subscriber to this Completable instance which
* will receive only an onError or onComplete event.
* @param <T> the value type of the subscriber
* @param s the reactive-streams Subscriber, not null
* @throws NullPointerException if s is null
*/
public final <T> void unsafeSubscribe(final Subscriber<T> s) {
unsafeSubscribe(s, true);
}
/**
* Performs the actual unsafe subscription and calls the onStart if required.
* @param <T> the value type of the subscriber
* @param s the subscriber instance, not null
* @param callOnStart if true, the Subscriber.onStart will be called
* @throws NullPointerException if s is null
*/
private <T> void unsafeSubscribe(final Subscriber<T> s, boolean callOnStart) {
requireNonNull(s);
try {
if (callOnStart) {
s.onStart();
}
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
s.onCompleted();
}
@Override
public void onError(Throwable e) {
s.onError(e);
}
@Override
public void onSubscribe(Subscription d) {
s.add(d);
}
});
RxJavaHooks.onObservableReturn(s);
} catch (NullPointerException ex) { // NOPMD
throw ex;
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
ex = RxJavaHooks.onObservableError(ex);
RxJavaHooks.onError(ex);
throw toNpe(ex);
}
}
/**
* Subscribes a regular Subscriber to this Completable instance which
* will receive only an onError or onComplete event
* and handles exceptions thrown by its onXXX methods.
* @param <T> the value type of the subscriber
* @param s the reactive-streams Subscriber, not null
* @throws NullPointerException if s is null
*/
public final <T> void subscribe(Subscriber<T> s) {
s.onStart();
if (!(s instanceof SafeSubscriber)) {
s = new SafeSubscriber<T>(s);
}
unsafeSubscribe(s, false);
}
/**
* Returns a Completable which subscribes the child subscriber on the specified scheduler, making
* sure the subscription side-effects happen on that specific thread of the scheduler.
* @param scheduler the Scheduler to subscribe on
* @return the new Completable instance
* @throws NullPointerException if scheduler is null
*/
public final Completable subscribeOn(final Scheduler scheduler) {
requireNonNull(scheduler);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
// FIXME cancellation of this schedule
final Scheduler.Worker w = scheduler.createWorker();
w.schedule(new Action0() {
@Override
public void call() {
try {
unsafeSubscribe(s);
} finally {
w.unsubscribe();
}
}
});
}
});
}
/**
* Returns a Completable that runs this Completable and emits a TimeoutException in case
* this Completable doesn't complete within the given time.
* @param timeout the timeout value
* @param unit the timeout unit
* @return the new Completable instance
* @throws NullPointerException if unit is null
*/
public final Completable timeout(long timeout, TimeUnit unit) {
return timeout0(timeout, unit, Schedulers.computation(), null);
}
/**
* Returns a Completable that runs this Completable and switches to the other Completable
* in case this Completable doesn't complete within the given time.
* @param timeout the timeout value
* @param unit the timeout unit
* @param other the other Completable instance to switch to in case of a timeout
* @return the new Completable instance
* @throws NullPointerException if unit or other is null
*/
public final Completable timeout(long timeout, TimeUnit unit, Completable other) {
requireNonNull(other);
return timeout0(timeout, unit, Schedulers.computation(), other);
}
/**
* Returns a Completable that runs this Completable and emits a TimeoutException in case
* this Completable doesn't complete within the given time while "waiting" on the specified
* Scheduler.
* @param timeout the timeout value
* @param unit the timeout unit
* @param scheduler the scheduler to use to wait for completion
* @return the new Completable instance
* @throws NullPointerException if unit or scheduler is null
*/
public final Completable timeout(long timeout, TimeUnit unit, Scheduler scheduler) {
return timeout0(timeout, unit, scheduler, null);
}
/**
* Returns a Completable that runs this Completable and switches to the other Completable
* in case this Completable doesn't complete within the given time while "waiting" on
* the specified scheduler.
* @param timeout the timeout value
* @param unit the timeout unit
* @param scheduler the scheduler to use to wait for completion
* @param other the other Completable instance to switch to in case of a timeout
* @return the new Completable instance
* @throws NullPointerException if unit, scheduler or other is null
*/
public final Completable timeout(long timeout, TimeUnit unit, Scheduler scheduler, Completable other) {
requireNonNull(other);
return timeout0(timeout, unit, scheduler, other);
}
/**
* Returns a Completable that runs this Completable and optionally switches to the other Completable
* in case this Completable doesn't complete within the given time while "waiting" on
* the specified scheduler.
* @param timeout the timeout value
* @param unit the timeout unit
* @param scheduler the scheduler to use to wait for completion
* @param other the other Completable instance to switch to in case of a timeout,
* if null a TimeoutException is emitted instead
* @return the new Completable instance
* @throws NullPointerException if unit or scheduler
*/
public final Completable timeout0(long timeout, TimeUnit unit, Scheduler scheduler, Completable other) {
requireNonNull(unit);
requireNonNull(scheduler);
return create(new CompletableOnSubscribeTimeout(this, timeout, unit, scheduler, other));
}
/**
* Calls the specified converter function during assembly time and returns its resulting value.
* <p>
* This allows fluent conversion to any other type.
* @param <R> the resulting object type
* @param converter the function that receives the current Single instance and returns a value
* @return the value returned by the function
*/
public final <R> R to(Func1<? super Completable, R> converter) {
return converter.call(this);
}
/**
* Returns an Observable which when subscribed to subscribes to this Completable and
* relays the terminal events to the subscriber.
* @param <T> the target type of the Observable
* @return the new Observable created
*/
public final <T> Observable<T> toObservable() {
return Observable.unsafeCreate(new Observable.OnSubscribe<T>() {
@Override
public void call(Subscriber<? super T> s) {
unsafeSubscribe(s);
}
});
}
/**
* Converts this Completable into a Single which when this Completable completes normally,
* calls the given supplier and emits its returned value through onSuccess.
* @param <T> the value type of the resulting Single
* @param completionValueFunc0 the value supplier called when this Completable completes normally
* @return the new Single instance
* @throws NullPointerException if completionValueFunc0 is null
*/
public final <T> Single<T> toSingle(final Func0<? extends T> completionValueFunc0) {
requireNonNull(completionValueFunc0);
return Single.create(new rx.Single.OnSubscribe<T>() {
@Override
public void call(final SingleSubscriber<? super T> s) {
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
T v;
try {
v = completionValueFunc0.call();
} catch (Throwable e) {
s.onError(e);
return;
}
if (v == null) {
s.onError(new NullPointerException("The value supplied is null"));
} else {
s.onSuccess(v);
}
}
@Override
public void onError(Throwable e) {
s.onError(e);
}
@Override
public void onSubscribe(Subscription d) {
s.add(d);
}
});
}
});
}
/**
* Converts this Completable into a Single which when this Completable completes normally,
* emits the given value through onSuccess.
* @param <T> the value type of the resulting Single
* @param completionValue the value to emit when this Completable completes normally
* @return the new Single instance
* @throws NullPointerException if completionValue is null
*/
public final <T> Single<T> toSingleDefault(final T completionValue) {
requireNonNull(completionValue);
return toSingle(new Func0<T>() {
@Override
public T call() {
return completionValue;
}
});
}
/**
* Returns a Completable which makes sure when a subscriber cancels the subscription, the
* dispose is called on the specified scheduler
* @param scheduler the target scheduler where to execute the cancellation
* @return the new Completable instance
* @throws NullPointerException if scheduler is null
*/
public final Completable unsubscribeOn(final Scheduler scheduler) {
requireNonNull(scheduler);
return create(new OnSubscribe() {
@Override
public void call(final rx.CompletableSubscriber s) {
unsafeSubscribe(new rx.CompletableSubscriber() {
@Override
public void onCompleted() {
s.onCompleted();
}
@Override
public void onError(Throwable e) {
s.onError(e);
}
@Override
public void onSubscribe(final Subscription d) {
s.onSubscribe(Subscriptions.create(new Action0() {
@Override
public void call() {
final Scheduler.Worker w = scheduler.createWorker();
w.schedule(new Action0() {
@Override
public void call() {
try {
d.unsubscribe();
} finally {
w.unsubscribe();
}
}
});
}
}));
}
});
}
});
}
// -------------------------------------------------------------------------
// Fluent test support, super handy and reduces test preparation boilerplate
// -------------------------------------------------------------------------
/**
* Creates an AssertableSubscriber that requests {@code Long.MAX_VALUE} and subscribes
* it to this Observable.
* <dl>
* <dt><b>Backpressure:</b><dt>
* <dd>The returned AssertableSubscriber consumes this Observable in an unbounded fashion.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code test} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* <p>History: 1.2.3 - experimental
* @return the new AssertableSubscriber instance
* @since 1.3
*/
public final AssertableSubscriber<Void> test() {
AssertableSubscriberObservable<Void> ts = AssertableSubscriberObservable.create(Long.MAX_VALUE);
subscribe(ts);
return ts;
}
}