/*
    * 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.utils;
  
  import org.apache.hadoop.util.Progressable;
  import org.junit.Test;
  
  import junit.framework.Assert;
  
  import java.lang.reflect.Field;
  import java.lang.reflect.Modifier;
  import java.util.concurrent.Callable;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.FutureTask;
  
  /**
   * Test ProgressableUtils
   */
  public class TestProgressableUtils {
    @Test
    public void testProgressableUtils() throws NoSuchFieldException,
        IllegalAccessException {
      final int sleepTime = 1800;
      final int msecPeriod = 500;
      ExecutorService executor = Executors.newFixedThreadPool(1);
      executor.submit(new Runnable() {
        @Override
        public void run() {
          try {
            Thread.sleep(sleepTime);
          } catch (InterruptedException e) {
            throw new IllegalStateException();
          }
        }
      });
      executor.shutdown();
      CountProgressable countProgressable = new CountProgressable();
      ProgressableUtils.awaitExecutorTermination(executor, countProgressable,
          msecPeriod);
      Assert.assertTrue(countProgressable.counter >= sleepTime / msecPeriod);
      Assert.assertTrue(
          countProgressable.counter <= (sleepTime + msecPeriod) / msecPeriod);
    }
  
    private static class CountProgressable implements Progressable {
      private int counter = 0;
  
      @Override
      public void progress() {
        counter++;
      }
    }
  }