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WaitIOCommand xref
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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, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.giraph.ooc.command;
20  
21  import org.apache.giraph.ooc.OutOfCoreEngine;
22  
23  import java.io.IOException;
24  import java.util.concurrent.TimeUnit;
25  
26  /**
27   * IOCommand to do nothing regarding moving data to/from disk.
28   */
29  public class WaitIOCommand extends IOCommand {
30    /** How long should the disk be idle? (in milliseconds) */
31    private final long waitDuration;
32  
33    /**
34     * Constructor
35     *
36     * @param oocEngine out-of-core engine
37     * @param waitDuration duration of wait
38     */
39    public WaitIOCommand(OutOfCoreEngine oocEngine, long waitDuration) {
40      super(oocEngine, -1);
41      this.waitDuration = waitDuration;
42    }
43  
44    @Override
45    public boolean execute() throws IOException {
46      try {
47        TimeUnit.MILLISECONDS.sleep(waitDuration);
48      } catch (InterruptedException e) {
49        throw new IllegalStateException("execute: caught InterruptedException " +
50            "while IO thread is waiting!");
51      }
52      return true;
53    }
54  
55    @Override
56    public IOCommandType getType() {
57      return IOCommandType.WAIT;
58    }
59  
60    @Override
61    public String toString() {
62      return "WaitIOCommand: (duration = " + waitDuration + "ms)";
63    }
64  }