content: /*
   * 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 ExecutionStateTracker}. */
  public class ExecutionStateTrackerTest {
  
    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;
  
      public TestExecutionState(String stateName) {
        super(stateName);
      }
  
      @Override
      public void takeSample(long millisSinceLastSample) {
        totalMillis += millisSinceLastSample;
      }
  
      @Override
      public void reportLull(Thread trackedThread, long millis) {}
    }
  
    private final TestExecutionState testExecutionState = new TestExecutionState("activity");
  
    @Test
    public void testReset() throws Exception {
      ExecutionStateTracker tracker = createTracker();
      try (Closeable c1 = tracker.activate(new Thread())) {
        try (Closeable c2 = tracker.enterState(testExecutionState)) {
          sampler.doSampling(400);
          assertThat(testExecutionState.totalMillis, equalTo(400L));
        }
      }
  
      tracker.reset();
      assertThat(tracker.getTrackedThread(), equalTo(null));
      assertThat(tracker.getCurrentState(), equalTo(null));
      assertThat(tracker.getNumTransitions(), equalTo(0L));
      assertThat(tracker.getMillisSinceLastTransition(), equalTo(0L));
      assertThat(tracker.getTransitionsAtLastSample(), equalTo(0L));
      assertThat(tracker.getNextLullReportMs(), equalTo(TimeUnit.MINUTES.toMillis(5)));
    }
  
    private ExecutionStateTracker createTracker() {
      return new ExecutionStateTracker(sampler);
    }
  }
  