1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.juneau.commons.concurrent;
18
19 import static org.apache.juneau.commons.utils.Utils.*;
20
21 import java.util.concurrent.locks.*;
22
23 /**
24 * A simple auto-closeable wrapper around a lock.
25 */
26 public class SimpleLock implements AutoCloseable {
27
28 /**
29 * A simple no-op lock.
30 */
31 public static final SimpleLock NO_OP = new SimpleLock(null);
32
33 private final Lock lock;
34
35 /**
36 * Constructor.
37 *
38 * @param lock The lock being wrapped.
39 */
40 public SimpleLock(Lock lock) {
41 this.lock = lock;
42 if (nn(lock))
43 lock.lock();
44 }
45
46 @Override
47 public void close() {
48 if (nn(lock))
49 lock.unlock();
50 }
51 }