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.triggers;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  import static org.mockito.Mockito.when;
  
  import org.apache.beam.runners.core.triggers.TriggerStateMachineTester.SimpleTriggerStateMachineTester;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
  import org.apache.beam.sdk.transforms.windowing.Sessions;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.Mock;
  import org.mockito.Mockito;
  import org.mockito.MockitoAnnotations;
  
  /** Tests for {@link AfterFirstStateMachine}. */
  @RunWith(JUnit4.class)
  public class AfterFirstStateMachineTest {
  
    @Mock private TriggerStateMachine mockTrigger1;
    @Mock private TriggerStateMachine mockTrigger2;
    private SimpleTriggerStateMachineTester<IntervalWindow> tester;
  
    private static TriggerStateMachine.TriggerContext anyTriggerContext() {
      return Mockito.any();
    }
  
    @Before
    public void initMocks() {
      MockitoAnnotations.initMocks(this);
    }
  
    @Test
    public void testNeitherShouldFireFixedWindows() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterFirstStateMachine.of(mockTrigger1, mockTrigger2),
              FixedWindows.of(Duration.millis(10)));
  
      tester.injectElements(1);
      IntervalWindow window = new IntervalWindow(new Instant(0), new Instant(10));
  
      when(mockTrigger1.shouldFire(anyTriggerContext())).thenReturn(false);
      when(mockTrigger2.shouldFire(anyTriggerContext())).thenReturn(false);
  
      assertFalse(tester.shouldFire(window)); // should not fire
      assertFalse(tester.isMarkedFinished(window)); // not finished
    }
  
    @Test
    public void testOnlyT1ShouldFireFixedWindows() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterFirstStateMachine.of(mockTrigger1, mockTrigger2),
              FixedWindows.of(Duration.millis(10)));
      tester.injectElements(1);
      IntervalWindow window = new IntervalWindow(new Instant(1), new Instant(11));
  
      when(mockTrigger1.shouldFire(anyTriggerContext())).thenReturn(true);
      when(mockTrigger2.shouldFire(anyTriggerContext())).thenReturn(false);
  
      assertTrue(tester.shouldFire(window)); // should fire
  
      tester.fireIfShouldFire(window);
      assertTrue(tester.isMarkedFinished(window));
    }
  
    @Test
    public void testOnlyT2ShouldFireFixedWindows() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterFirstStateMachine.of(mockTrigger1, mockTrigger2),
              FixedWindows.of(Duration.millis(10)));
      tester.injectElements(1);
      IntervalWindow window = new IntervalWindow(new Instant(1), new Instant(11));
  
      when(mockTrigger1.shouldFire(anyTriggerContext())).thenReturn(false);
      when(mockTrigger2.shouldFire(anyTriggerContext())).thenReturn(true);
      assertTrue(tester.shouldFire(window)); // should fire
  
      tester.fireIfShouldFire(window); // now finished
      assertTrue(tester.isMarkedFinished(window));
    }
  
    @Test
    public void testBothShouldFireFixedWindows() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterFirstStateMachine.of(mockTrigger1, mockTrigger2),
              FixedWindows.of(Duration.millis(10)));
      tester.injectElements(1);
      IntervalWindow window = new IntervalWindow(new Instant(1), new Instant(11));
  
      when(mockTrigger1.shouldFire(anyTriggerContext())).thenReturn(true);
      when(mockTrigger2.shouldFire(anyTriggerContext())).thenReturn(true);
      assertTrue(tester.shouldFire(window)); // should fire
  
      tester.fireIfShouldFire(window);
      assertTrue(tester.isMarkedFinished(window));
    }
  
    /**
     * Tests that if the first trigger rewinds to be non-finished in the merged window, then it
     * becomes the currently active trigger again, with real triggers.
     */
    @Test
    public void testShouldFireAfterMerge() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterEachStateMachine.inOrder(
                  AfterFirstStateMachine.of(
                      AfterPaneStateMachine.elementCountAtLeast(5),
                      AfterWatermarkStateMachine.pastEndOfWindow()),
                  RepeatedlyStateMachine.forever(AfterPaneStateMachine.elementCountAtLeast(1))),
              Sessions.withGapDuration(Duration.millis(10)));
  
      // Finished the AfterFirst in the first window
      tester.injectElements(1);
      IntervalWindow firstWindow = new IntervalWindow(new Instant(1), new Instant(11));
      assertFalse(tester.shouldFire(firstWindow));
      tester.advanceInputWatermark(new Instant(11));
      assertTrue(tester.shouldFire(firstWindow));
      tester.fireIfShouldFire(firstWindow);
  
      // Set up second window where it is not done
      tester.injectElements(5);
      IntervalWindow secondWindow = new IntervalWindow(new Instant(5), new Instant(15));
      assertFalse(tester.shouldFire(secondWindow));
  
      // Merge them, if the merged window were on the second trigger, it would be ready
      tester.mergeWindows();
      IntervalWindow mergedWindow = new IntervalWindow(new Instant(1), new Instant(15));
      assertFalse(tester.shouldFire(mergedWindow));
  
      // Now adding 3 more makes the AfterFirst ready to fire
      tester.injectElements(1, 2, 3, 4, 5);
      tester.mergeWindows();
      assertTrue(tester.shouldFire(mergedWindow));
    }
  }
  