/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.giraph.ooc.command;

 import org.apache.giraph.ooc.OutOfCoreEngine;

 import java.io.IOException;

 import java.util.concurrent.TimeUnit;

 /**

  * IOCommand to do nothing regarding moving data to/from disk.

  */

 public class WaitIOCommand extends IOCommand {

   /** How long should the disk be idle? (in milliseconds) */

   private final long waitDuration;

   /**

    * Constructor

    *

    * @param oocEngine out-of-core engine

    * @param waitDuration duration of wait

    */

   public WaitIOCommand(OutOfCoreEngine oocEngine, long waitDuration) {

     super(oocEngine, -1);

     this.waitDuration = waitDuration;

   }

   @Override

   public boolean execute() throws IOException {

     try {

       TimeUnit.MILLISECONDS.sleep(waitDuration);

     } catch (InterruptedException e) {

       throw new IllegalStateException("execute: caught InterruptedException " +

           "while IO thread is waiting!");

     }

     return true;

   }

   @Override

   public IOCommandType getType() {

     return IOCommandType.WAIT;

   }

   @Override

   public String toString() {

     return "WaitIOCommand: (duration = " + waitDuration + "ms)";

   }

 }