001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.commons.concurrent;
018
019import static org.apache.juneau.commons.utils.Utils.*;
020
021import java.util.concurrent.locks.*;
022
023/**
024 * A simple auto-closeable wrapper around a lock.
025 */
026public class SimpleLock implements AutoCloseable {
027
028   /**
029    * A simple no-op lock.
030    */
031   public static final SimpleLock NO_OP = new SimpleLock(null);
032
033   private final Lock lock;
034
035   /**
036    * Constructor.
037    *
038    * @param lock The lock being wrapped.
039    */
040   public SimpleLock(Lock lock) {
041      this.lock = lock;
042      if (nn(lock))
043         lock.lock();
044   }
045
046   @Override
047   public void close() {
048      if (nn(lock))
049         lock.unlock();
050   }
051}