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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.action;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* A listener that ensures that only one of onResponse or onFailure is called. And the method
* the is called is only called once. Subclasses should implement notification logic with
* innerOnResponse and innerOnFailure.
*/
public abstract class NotifyOnceListener implements ActionListener {
private final AtomicBoolean hasBeenCalled = new AtomicBoolean(false);
protected abstract void innerOnResponse(Response response);
protected abstract void innerOnFailure(Exception e);
@Override
public final void onResponse(Response response) {
if (hasBeenCalled.compareAndSet(false, true)) {
innerOnResponse(response);
}
}
@Override
public final void onFailure(Exception e) {
if (hasBeenCalled.compareAndSet(false, true)) {
innerOnFailure(e);
}
}
}