TestAbstractTask.java

/**
 * Copyright 2015 StreamSets Inc.
 *
 * Licensed under 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 com.streamsets.datacollector.task;

import org.junit.Assert;
import org.junit.Test;

import com.streamsets.datacollector.task.AbstractTask;
import com.streamsets.datacollector.task.Task;

import java.util.concurrent.CountDownLatch;

public class TestAbstractTask {

  @Test(expected = NullPointerException.class)
  public void testConstructorInvalid() {
    new AbstractTask(null){};
  }

  @Test
  public void testConstructorValid() {
    Task task = new AbstractTask("name"){};
    Assert.assertEquals("name", task.getName());
  }

  @Test
  public void testLifecycleAndStatus() {
    Task task = new AbstractTask("name"){};
    Assert.assertEquals(Task.Status.CREATED, task.getStatus());
    task.init();
    Assert.assertEquals(Task.Status.INITIALIZED, task.getStatus());
    task.run();
    Assert.assertEquals(Task.Status.RUNNING, task.getStatus());
    task.stop();
    Assert.assertEquals(Task.Status.STOPPED, task.getStatus());

    task = new AbstractTask("name"){};
    task.init();
    task.stop();
    Assert.assertEquals(Task.Status.STOPPED, task.getStatus());

    task.stop();

    Assert.assertTrue(task.toString().contains("name"));
    Assert.assertTrue(task.toString().contains("STOPPED"));
  }

  @Test(expected = IllegalStateException.class)
  public void testInvalidLifecycle1() {
    Task task = new AbstractTask("name"){};
    task.run();
  }

  @Test(expected = IllegalStateException.class)
  public void testInvalidLifecycle2() {
    Task task = new AbstractTask("name"){};
    task.stop();
  }

  @Test(expected = IllegalStateException.class)
  public void testInvalidLifecycle3() {
    Task task = new AbstractTask("name"){};
    task.init();
    task.init();
  }

  @Test(expected = IllegalStateException.class)
  public void testInvalidLifecycle4() {
    Task task = new AbstractTask("name"){};
    task.init();
    task.run();
    task.run();
  }

  @Test(expected = RuntimeException.class)
  public void testInitError() {
    Task task = new AbstractTask("name"){
      @Override
      public void initTask() {
        throw new RuntimeException();
      }
    };
    try {
      task.init();
    } finally {
      Assert.assertEquals(Task.Status.ERROR, task.getStatus());
    }
  }

  @Test(expected = RuntimeException.class)
  public void testRunError() {
    Task task = new AbstractTask("name"){
      @Override
      public void runTask() {
        throw new RuntimeException();
      }
    };
    task.init();
    try {
      task.run();
    } finally {
      Assert.assertEquals(Task.Status.ERROR, task.getStatus());
    }
  }

  @Test
  public void testStopError() {
    Task task = new AbstractTask("name"){
      @Override
      public void stopTask() {
        throw new RuntimeException();
      }
    };
    task.init();
    task.run();
    task.stop();
    Assert.assertEquals(Task.Status.ERROR, task.getStatus());
  }

  @Test(expected = IllegalStateException.class)
  public void testInitInError() {
    Task task = new AbstractTask("name"){
      @Override
      public Status getStatus() {
        return Status.ERROR;
      }
    };
    task.init();
  }

  @Test(expected = IllegalStateException.class)
  public void testRunInError() {
    Task task = new AbstractTask("name"){
      @Override
      public Status getStatus() {
        return Status.ERROR;
      }
    };
    task.run();
  }

  @Test(expected = IllegalStateException.class)
  public void testStopInError() {
    Task task = new AbstractTask("name"){
      @Override
      public Status getStatus() {
        return Status.ERROR;
      }
    };
    task.stop();
  }

  @Test
  public void testWaitWhileRunning() throws Exception {
    final CountDownLatch latch1 = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    final Task task = new AbstractTask("name"){};
    task.init();
    Thread waiter = new Thread() {
      @Override
      public void run() {
        try {
          latch1.await();
          latch2.countDown();
          task.waitWhileRunning();
        } catch (InterruptedException ex) {
          //NOP
        }
      }
    };
    waiter.start();
    task.run();
    latch1.countDown();
    latch2.await();
    task.stop();
    waiter.join();
  }

  @Test
  public void testInvalidWaitWhileRunningWhenStopped() throws Exception {
    final Task task = new AbstractTask("name"){};
    task.init();
    task.run();
    task.stop();
    task.waitWhileRunning();
  }

  @Test(expected = IllegalStateException.class)
  public void testInvalidWaitWhileRunning1() throws Exception {
    final Task task = new AbstractTask("name"){};
    task.waitWhileRunning();
  }

  @Test(expected = IllegalStateException.class)
  public void testInvalidWaitWhileRunning2() throws Exception {
    final Task task = new AbstractTask("name"){};
    task.init();
    task.waitWhileRunning();
  }

  @Test(expected = IllegalStateException.class)
  public void testInvalidWaitWhileRunning4() throws Exception {
    Task task = new AbstractTask("name"){
      @Override
      public Status getStatus() {
        return Status.ERROR;
      }
    };
    task.waitWhileRunning();
  }
}