1 package org.apache.maven.surefire.extensions.util;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import javax.annotation.Nonnegative;
23 import javax.annotation.Nonnull;
24 import java.io.Closeable;
25 import java.io.IOException;
26
27 /**
28 * Decrements {@code countdown} and calls {@code closeable} if reached zero.
29 */
30 public final class CountdownCloseable
31 implements Closeable
32 {
33 private final Closeable closeable;
34 private volatile int countdown;
35
36 public CountdownCloseable( @Nonnull Closeable closeable, @Nonnegative int countdown )
37 {
38 this.closeable = closeable;
39 this.countdown = countdown;
40 }
41
42 @Override
43 public synchronized void close() throws IOException
44 {
45 if ( --countdown == 0 )
46 {
47 try
48 {
49 closeable.close();
50 }
51 finally
52 {
53 notifyAll();
54 }
55 }
56 }
57
58 /**
59 * Waiting for one Thread in {@link CommandlineExecutor#awaitExit()}.
60 *
61 * @throws InterruptedException see {@link Object#wait()}
62 */
63 public synchronized void awaitClosed() throws InterruptedException
64 {
65 if ( countdown > 0 )
66 {
67 wait();
68 }
69 }
70 }