com.alibaba.rocketmq.remoting.common.SemaphoreReleaseOnlyOnce Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 com.alibaba.rocketmq.remoting.common;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* @author shijia.wxr
*/
public class SemaphoreReleaseOnlyOnce {
private final AtomicBoolean released = new AtomicBoolean(false);
private final Semaphore semaphore;
public SemaphoreReleaseOnlyOnce(Semaphore semaphore) {
this.semaphore = semaphore;
}
public void release() {
if (this.semaphore != null) {
if (this.released.compareAndSet(false, true)) {
this.semaphore.release();
}
}
}
public Semaphore getSemaphore() {
return semaphore;
}
}