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