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Reactive Extensions for Java
/*
* 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.internal.observers;
import io.reactivex.rxjava3.core.Observer;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.*;
import io.reactivex.rxjava3.internal.disposables.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class DisposableLambdaObserver implements Observer, Disposable {
final Observer super T> downstream;
final Consumer super Disposable> onSubscribe;
final Action onDispose;
Disposable upstream;
public DisposableLambdaObserver(Observer super T> actual,
Consumer super Disposable> onSubscribe,
Action onDispose) {
this.downstream = actual;
this.onSubscribe = onSubscribe;
this.onDispose = onDispose;
}
@Override
public void onSubscribe(Disposable d) {
// this way, multiple calls to onSubscribe can show up in tests that use doOnSubscribe to validate behavior
try {
onSubscribe.accept(d);
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
d.dispose();
this.upstream = DisposableHelper.DISPOSED;
EmptyDisposable.error(e, downstream);
return;
}
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
downstream.onNext(t);
}
@Override
public void onError(Throwable t) {
if (upstream != DisposableHelper.DISPOSED) {
upstream = DisposableHelper.DISPOSED;
downstream.onError(t);
} else {
RxJavaPlugins.onError(t);
}
}
@Override
public void onComplete() {
if (upstream != DisposableHelper.DISPOSED) {
upstream = DisposableHelper.DISPOSED;
downstream.onComplete();
}
}
@Override
public void dispose() {
Disposable d = upstream;
if (d != DisposableHelper.DISPOSED) {
upstream = DisposableHelper.DISPOSED;
try {
onDispose.run();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
RxJavaPlugins.onError(e);
}
d.dispose();
}
}
@Override
public boolean isDisposed() {
return upstream.isDisposed();
}
}
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