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OperatorOnErrorResumeNextViaObservable
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rxjava-core/src/main/java/rx/operators/OperationOnErrorResumeNextViaObservable.java
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rxjava-core/src/main/java/rx/operators/OperatorOnErrorResumeNextViaObservable.java
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/** | ||
* 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.operators; | ||
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import rx.Observable; | ||
import rx.Observable.Operator; | ||
import rx.Subscriber; | ||
import rx.subscriptions.SerialSubscription; | ||
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/** | ||
* Instruct an Observable to pass control to another Observable rather than invoking | ||
* <code>onError</code> if it encounters an error. | ||
* <p> | ||
* <img width="640" src="https://github.com/Netflix/RxJava/wiki/images/rx-operators/onErrorResumeNext.png"> | ||
* <p> | ||
* By default, when an Observable encounters an error that prevents it from emitting the expected | ||
* item to its Observer, the Observable invokes its Observer's <code>onError</code> method, and | ||
* then quits without invoking any more of its Observer's methods. The onErrorResumeNext operation | ||
* changes this behavior. If you pass an Observable (resumeSequence) to onErrorResumeNext, if the | ||
* source Observable encounters an error, instead of invoking its Observer's <code>onError</code> | ||
* method, it will instead relinquish control to this new Observable, which will invoke the | ||
* Observer's <code>onNext</code> method if it is able to do so. In such a case, because no | ||
* Observable necessarily invokes <code>onError</code>, the Observer may never know that an error | ||
* happened. | ||
* <p> | ||
* You can use this to prevent errors from propagating or to supply fallback data should errors be | ||
* encountered. | ||
* | ||
* @param <T> the value type | ||
*/ | ||
public final class OperatorOnErrorResumeNextViaObservable<T> implements Operator<T, T> { | ||
final Observable<? extends T> resumeSequence; | ||
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public OperatorOnErrorResumeNextViaObservable(Observable<? extends T> resumeSequence) { | ||
this.resumeSequence = resumeSequence; | ||
} | ||
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@Override | ||
public Subscriber<? super T> call(final Subscriber<? super T> child) { | ||
// shared subscription won't work here | ||
Subscriber<T> s = new Subscriber<T>() { | ||
@Override | ||
public void onNext(T t) { | ||
child.onNext(t); | ||
} | ||
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@Override | ||
public void onError(Throwable e) { | ||
unsubscribe(); | ||
resumeSequence.unsafeSubscribe(child); | ||
} | ||
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@Override | ||
public void onCompleted() { | ||
child.onCompleted(); | ||
} | ||
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}; | ||
child.add(s); | ||
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return s; | ||
} | ||
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} |
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