content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.util.executor;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import org.junit.Test;
  
  import java.util.Random;
  import java.util.concurrent.ScheduledFuture;
  import java.util.concurrent.TimeUnit;
  
  /**
   * Tests the {@link ControllableSchedulerTest}.
   */
  public class ControllableSchedulerTest {
    @Test
    public void submit() throws Exception {
      CountTask task = new CountTask();
      ControllableScheduler scheduler = new ControllableScheduler();
      scheduler.submit(task);
      assertFalse(scheduler.schedulerIsIdle());
      scheduler.runNextPendingCommand();
      assertEquals(1, task.runTimes());
      assertTrue(scheduler.schedulerIsIdle());
    }
  
    @Test
    public void schedule() throws Exception {
      CountTask task = new CountTask();
      ControllableScheduler scheduler = new ControllableScheduler();
      scheduler.schedule(task, 5, TimeUnit.HOURS);
      assertTrue(scheduler.schedulerIsIdle());
      scheduler.jumpAndExecute(5, TimeUnit.HOURS);
      assertEquals(1, task.runTimes());
    }
  
    @Test
    public void scheduleAtFixedRate() throws Exception {
      CountTask task = new CountTask();
      ControllableScheduler scheduler = new ControllableScheduler();
      int delayDays = 5;
      int periodDays = 10;
      scheduler.scheduleAtFixedRate(task, delayDays, periodDays, TimeUnit.DAYS);
  
      scheduler.jumpAndExecute(3 * 24, TimeUnit.HOURS);
      assertEquals(0, task.runTimes());
  
      scheduler.jumpAndExecute(2 * 24 * 60, TimeUnit.MINUTES);
      assertEquals(1, task.runTimes());
  
      Random random = new Random();
      int daysToJump = random.nextInt(1000000000);
      scheduler.jumpAndExecute(daysToJump, TimeUnit.DAYS);
      assertEquals(daysToJump / periodDays + 1, task.runTimes());
      assertTrue(scheduler.schedulerIsIdle());
    }
  
    @Test
    public void cancel() {
      CountTask task = new CountTask();
      ControllableScheduler scheduler = new ControllableScheduler();
      ScheduledFuture<?> future = scheduler.schedule(task, 5, TimeUnit.HOURS);
      assertTrue(scheduler.schedulerIsIdle());
      future.cancel(true);
      scheduler.jumpAndExecute(5, TimeUnit.HOURS);
      assertEquals(0, task.runTimes());
    }
  
    /**
     * A count task tracking how many times this task runs.
     */
    private class CountTask implements Runnable {
      private int mNum;
  
      /**
       * Constructs a new {@link CountTask}.
       */
      CountTask() {
        mNum = 0;
      }
  
      @Override
      public void run() {
        mNum++;
      }
  
      /**
       * @return how many times this count task runs
       */
      public int runTimes() {
        return mNum;
      }
    }
  }
  