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   * 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.beam.runners.core.metrics;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  import static org.mockito.Mockito.mock;
  
  import java.io.Closeable;
  import java.util.concurrent.TimeUnit;
  import org.apache.beam.runners.core.metrics.ExecutionStateTracker.ExecutionState;
  import org.joda.time.DateTimeUtils.MillisProvider;
  import org.junit.Before;
  import org.junit.Test;
  
  /** Tests for {@link org.apache.beam.runners.core.metrics.ExecutionStateSampler}. */
  public class ExecutionStateSamplerTest {
  
    private MillisProvider clock;
    private ExecutionStateSampler sampler;
  
    @Before
    public void setUp() {
      clock = mock(MillisProvider.class);
      sampler = ExecutionStateSampler.newForTest(clock);
    }
  
    private static class TestExecutionState extends ExecutionState {
  
      private long totalMillis = 0;
      private boolean lullReported = false;
  
      public TestExecutionState(String stateName) {
        super(stateName);
      }
  
      @Override
      public void takeSample(long millisSinceLastSample) {
        totalMillis += millisSinceLastSample;
      }
  
      @Override
      public void reportLull(Thread trackedThread, long millis) {
        lullReported = true;
      }
    }
  
    private final TestExecutionState step1act1 = new TestExecutionState("activity1");
    private final TestExecutionState step1act2 = new TestExecutionState("activity2");
    private final TestExecutionState step2act1 = new TestExecutionState("activity1");
  
    @Test
    public void testOneThreadSampling() throws Exception {
      ExecutionStateTracker tracker = createTracker();
      try (Closeable c1 = tracker.activate(new Thread())) {
        try (Closeable c2 = tracker.enterState(step1act1)) {
          sampler.doSampling(400);
          assertThat(step1act1.totalMillis, equalTo(400L));
  
          sampler.doSampling(200);
          assertThat(step1act1.totalMillis, equalTo(400L + 200L));
        }
  
        sampler.doSampling(300); // no current state
        assertThat(step1act1.totalMillis, equalTo(400L + 200L));
        assertThat(step1act1.lullReported, equalTo(false));
      }
    }
  
    @Test
    public void testMultipleThreads() throws Exception {
      ExecutionStateTracker tracker1 = createTracker();
      ExecutionStateTracker tracker2 = createTracker();
      try (Closeable t1 = tracker1.activate(new Thread())) {
        try (Closeable t2 = tracker2.activate(new Thread())) {
          Closeable c1 = tracker1.enterState(step1act1);
          sampler.doSampling(101);
          Closeable c2 = tracker2.enterState(step2act1);
          sampler.doSampling(102);
          Closeable c3 = tracker1.enterState(step1act2);
          sampler.doSampling(203);
          c3.close();
          sampler.doSampling(104);
          c1.close();
          sampler.doSampling(105);
          c2.close();
        }
      }
  
      assertThat(step1act1.totalMillis, equalTo(101L + 102L + 104L));
      assertThat(step1act2.totalMillis, equalTo(203L));
      assertThat(step2act1.totalMillis, equalTo(102L + 203L + 104L + 105L));
  
      assertThat(step1act1.lullReported, equalTo(false));
      assertThat(step1act2.lullReported, equalTo(false));
      assertThat(step2act1.lullReported, equalTo(false));
    }
  
    @Test
    public void testLullDetectionOccurs() throws Exception {
      ExecutionStateTracker tracker1 = createTracker();
      try (Closeable t1 = tracker1.activate(new Thread())) {
        try (Closeable c = tracker1.enterState(step1act1)) {
          sampler.doSampling(TimeUnit.MINUTES.toMillis(6));
        }
      }
  
      assertThat(step1act1.lullReported, equalTo(true));
    }
  
    @Test
    public void testReset() throws Exception {
      sampler.lastSampleTimeMillis = 100L;
      sampler.reset();
      assertThat(sampler.lastSampleTimeMillis, equalTo(0L));
    }
  
    private ExecutionStateTracker createTracker() {
      return new ExecutionStateTracker(sampler);
    }
  }
  