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     */
017    package org.apache.servicemix.locks.impl;
018    
019    import java.util.concurrent.ConcurrentHashMap;
020    import java.util.concurrent.ConcurrentMap;
021    import java.util.concurrent.locks.Lock;
022    
023    import org.apache.servicemix.locks.LockManager;
024    
025    public class SimpleLockManager implements LockManager {
026    
027        private ConcurrentMap<String, Lock> locks = new ConcurrentHashMap<String, Lock>();
028    
029        public Lock getLock(String id) {
030            Lock lock = locks.get(id);
031            if (lock == null) {
032                lock = new SimpleLock();
033                Lock oldLock = locks.putIfAbsent(id, lock);
034                if (oldLock != null) {
035                    lock = oldLock;
036                }
037            }
038            return lock;
039        }
040    
041    }