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/*
* 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.common.util.concurrent;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Runnable that can only be run one time.
*/
public class RunOnce implements Runnable {
private final Runnable delegate;
private final AtomicBoolean hasRun;
public RunOnce(final Runnable delegate) {
this.delegate = Objects.requireNonNull(delegate);
this.hasRun = new AtomicBoolean(false);
}
@Override
public void run() {
if (hasRun.compareAndSet(false, true)) {
delegate.run();
}
}
/**
* {@code true} if the {@link RunOnce} has been executed once.
*/
public boolean hasRun() {
return hasRun.get();
}
}