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.dataflow.worker.windmill.client;
  
  import static com.google.common.truth.Truth.assertThat;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.util.function.Supplier;
  import org.joda.time.DateTime;
  import org.joda.time.Instant;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  @RunWith(JUnit4.class)
  public class StreamDebugMetricsTest {
  
    @Test
    public void testSummaryMetrics_noRestarts() throws InterruptedException {
      StreamDebugMetrics streamDebugMetrics = StreamDebugMetrics.forTesting(Instant::now);
      streamDebugMetrics.recordStart();
      streamDebugMetrics.recordSend();
      streamDebugMetrics.recordResponse();
      Thread.sleep(1000);
      StreamDebugMetrics.Snapshot metricsSnapshot = streamDebugMetrics.getSummaryMetrics();
      assertFalse(metricsSnapshot.shutdownTime().isPresent());
      assertTrue(metricsSnapshot.sleepLeft() <= 0);
      assertThat(metricsSnapshot.streamAge()).isGreaterThan(0);
      assertThat(metricsSnapshot.timeSinceLastSend()).isGreaterThan(0);
      assertThat(metricsSnapshot.timeSinceLastResponse()).isGreaterThan(0);
      assertFalse(metricsSnapshot.restartMetrics().isPresent());
  
      streamDebugMetrics.recordShutdown();
      StreamDebugMetrics.Snapshot metricsSnapshotAfterShutdown =
          streamDebugMetrics.getSummaryMetrics();
      assertTrue(metricsSnapshotAfterShutdown.shutdownTime().isPresent());
    }
  
    @Test
    public void testSummaryMetrics_sleep() {
      long sleepMs = 100;
      Instant aLongTimeAgo = Instant.parse("1998-09-04T00:00:00Z");
      Supplier<Instant> fakeClock = () -> aLongTimeAgo;
      StreamDebugMetrics streamDebugMetrics = StreamDebugMetrics.forTesting(fakeClock);
      streamDebugMetrics.recordSleep(sleepMs);
      StreamDebugMetrics.Snapshot metricsSnapshot = streamDebugMetrics.getSummaryMetrics();
      assertEquals(sleepMs, metricsSnapshot.sleepLeft());
    }
  
    @Test
    public void testSummaryMetrics_withRestarts() {
      String restartReason = "something bad happened";
      StreamDebugMetrics streamDebugMetrics = StreamDebugMetrics.forTesting(Instant::now);
      streamDebugMetrics.incrementAndGetErrors();
      streamDebugMetrics.incrementAndGetRestarts();
      streamDebugMetrics.recordRestartReason(restartReason);
  
      StreamDebugMetrics.Snapshot metricsSnapshot = streamDebugMetrics.getSummaryMetrics();
      assertTrue(metricsSnapshot.restartMetrics().isPresent());
      StreamDebugMetrics.RestartMetrics restartMetrics = metricsSnapshot.restartMetrics().get();
      assertThat(restartMetrics.lastRestartReason()).isEqualTo(restartReason);
      assertThat(restartMetrics.restartCount()).isEqualTo(1);
      assertThat(restartMetrics.errorCount()).isEqualTo(1);
      assertTrue(restartMetrics.lastRestartTime().isPresent());
      assertThat(restartMetrics.lastRestartTime().get()).isLessThan(DateTime.now());
      assertThat(restartMetrics.lastRestartTime().get().toInstant()).isGreaterThan(Instant.EPOCH);
    }
  
    @Test
    public void testResponseDebugString_neverReceivedResponse() {
      StreamDebugMetrics streamDebugMetrics = StreamDebugMetrics.forTesting(Instant::now);
      assertFalse(streamDebugMetrics.responseDebugString(Instant.now().getMillis()).isPresent());
    }
  
    @Test
    public void testResponseDebugString_withResponse() {
      StreamDebugMetrics streamDebugMetrics = StreamDebugMetrics.forTesting(Instant::now);
      streamDebugMetrics.recordResponse();
      assertTrue(streamDebugMetrics.responseDebugString(Instant.now().getMillis()).isPresent());
    }
  
    @Test
    public void testGetStartTime() {
      Instant aLongTimeAgo = Instant.parse("1998-09-04T00:00:00Z");
      Supplier<Instant> fakeClock = () -> aLongTimeAgo;
      StreamDebugMetrics streamDebugMetrics = StreamDebugMetrics.forTesting(fakeClock);
      assertEquals(0, streamDebugMetrics.getStartTimeMs());
      streamDebugMetrics.recordStart();
      assertThat(streamDebugMetrics.getStartTimeMs()).isEqualTo(aLongTimeAgo.getMillis());
    }
  
    @Test
    public void testGetLastSendTime() {
      Instant aLongTimeAgo = Instant.parse("1998-09-04T00:00:00Z");
      Supplier<Instant> fakeClock = () -> aLongTimeAgo;
      StreamDebugMetrics streamDebugMetrics = StreamDebugMetrics.forTesting(fakeClock);
      assertEquals(0, streamDebugMetrics.getLastSendTimeMs());
      streamDebugMetrics.recordSend();
      assertThat(streamDebugMetrics.getLastSendTimeMs()).isEqualTo(aLongTimeAgo.getMillis());
    }
  }
  