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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.maven.lifecycle.internal.concurrent;
20  
21  import java.util.concurrent.Executor;
22  import java.util.concurrent.ExecutorService;
23  import java.util.concurrent.Phaser;
24  
25  public class PhasingExecutor implements Executor, AutoCloseable {
26      private final ExecutorService executor;
27      private final Phaser phaser = new Phaser();
28  
29      public PhasingExecutor(ExecutorService executor) {
30          this.executor = executor;
31          this.phaser.register();
32      }
33  
34      @Override
35      public void execute(Runnable command) {
36          phaser.register();
37          executor.submit(() -> {
38              try {
39                  command.run();
40              } finally {
41                  phaser.arriveAndDeregister();
42              }
43          });
44      }
45  
46      public void await() {
47          phaser.arriveAndAwaitAdvance();
48      }
49  
50      @Override
51      public void close() {
52          executor.shutdownNow();
53      }
54  }