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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.internal.operators.single;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Consumer;
import io.reactivex.internal.disposables.EmptyDisposable;
import io.reactivex.plugins.RxJavaPlugins;
/**
* Calls a callback when the upstream calls onSubscribe with a disposable.
*
* @param the value type
*/
public final class SingleDoOnSubscribe extends Single {
final SingleSource source;
final Consumer onSubscribe;
public SingleDoOnSubscribe(SingleSource source, Consumer onSubscribe) {
this.source = source;
this.onSubscribe = onSubscribe;
}
@Override
protected void subscribeActual(final SingleObserver observer) {
source.subscribe(new DoOnSubscribeSingleObserver(observer, onSubscribe));
}
static final class DoOnSubscribeSingleObserver implements SingleObserver {
final SingleObserver downstream;
final Consumer onSubscribe;
boolean done;
DoOnSubscribeSingleObserver(SingleObserver actual, Consumer onSubscribe) {
this.downstream = actual;
this.onSubscribe = onSubscribe;
}
@Override
public void onSubscribe(Disposable d) {
try {
onSubscribe.accept(d);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
done = true;
d.dispose();
EmptyDisposable.error(ex, downstream);
return;
}
downstream.onSubscribe(d);
}
@Override
public void onSuccess(T value) {
if (done) {
return;
}
downstream.onSuccess(value);
}
@Override
public void onError(Throwable e) {
if (done) {
RxJavaPlugins.onError(e);
return;
}
downstream.onError(e);
}
}
}