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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.rxjava3.observers;
import java.util.concurrent.atomic.AtomicReference;
import io.reactivex.rxjava3.annotations.NonNull;
import io.reactivex.rxjava3.core.CompletableObserver;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import io.reactivex.rxjava3.internal.util.EndConsumerHelper;
/**
* An abstract {@link CompletableObserver} that allows asynchronous cancellation by implementing Disposable.
*
* All pre-implemented final methods are thread-safe.
*
*
Like all other consumers, {@code DisposableCompletableObserver} can be subscribed only once.
* Any subsequent attempt to subscribe it to a new source will yield an
* {@link IllegalStateException} with message {@code "It is not allowed to subscribe with a(n) multiple times."}.
*
* Implementation of {@link #onStart()}, {@link #onError(Throwable)} and
* {@link #onComplete()} are not allowed to throw any unchecked exceptions.
*
*
Example
* Disposable d =
* Completable.complete().delay(1, TimeUnit.SECONDS)
* .subscribeWith(new DisposableMaybeObserver<Integer>() {
* @Override public void onStart() {
* System.out.println("Start!");
* }
* @Override public void onError(Throwable t) {
* t.printStackTrace();
* }
* @Override public void onComplete() {
* System.out.println("Done!");
* }
* });
* // ...
* d.dispose();
*
*/
public abstract class DisposableCompletableObserver implements CompletableObserver, Disposable {
final AtomicReference upstream = new AtomicReference<>();
@Override
public final void onSubscribe(@NonNull Disposable d) {
if (EndConsumerHelper.setOnce(this.upstream, d, getClass())) {
onStart();
}
}
/**
* Called once the single upstream {@link Disposable} is set via {@link #onSubscribe(Disposable)}.
*/
protected void onStart() {
}
@Override
public final boolean isDisposed() {
return upstream.get() == DisposableHelper.DISPOSED;
}
@Override
public final void dispose() {
DisposableHelper.dispose(upstream);
}
}