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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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.
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  package org.apache.beam.runners.core.triggers;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  import static org.mockito.Mockito.verify;
  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.GlobalWindow;
  import org.apache.beam.sdk.transforms.windowing.GlobalWindows;
  import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
  import org.apache.beam.sdk.transforms.windowing.Sessions;
  import org.apache.beam.sdk.transforms.windowing.WindowFn;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  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 RepeatedlyStateMachine}. */
  @RunWith(JUnit4.class)
  public class RepeatedlyStateMachineTest {
  
    @Mock private TriggerStateMachine mockTrigger;
    private SimpleTriggerStateMachineTester<IntervalWindow> tester;
  
    private static TriggerStateMachine.TriggerContext anyTriggerContext() {
      return Mockito.any();
    }
  
    public void setUp(WindowFn<Object, IntervalWindow> windowFn) throws Exception {
      MockitoAnnotations.initMocks(this);
      tester =
          TriggerStateMachineTester.forTrigger(RepeatedlyStateMachine.forever(mockTrigger), windowFn);
    }
  
    /** Tests that onElement correctly passes the data on to the subtrigger. */
    @Test
    public void testOnElement() throws Exception {
      setUp(FixedWindows.of(Duration.millis(10)));
      tester.injectElements(37);
      verify(mockTrigger).onElement(Mockito.any());
    }
  
    /** Tests that the repeatedly is ready to fire whenever the subtrigger is ready. */
    @Test
    public void testShouldFire() throws Exception {
      setUp(FixedWindows.of(Duration.millis(10)));
  
      when(mockTrigger.shouldFire(anyTriggerContext())).thenReturn(true);
      assertTrue(tester.shouldFire(new IntervalWindow(new Instant(0), new Instant(10))));
  
      when(mockTrigger.shouldFire(Mockito.any())).thenReturn(false);
      assertFalse(tester.shouldFire(new IntervalWindow(new Instant(0), new Instant(10))));
    }
  
    @Test
    public void testShouldFireAfterMerge() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              RepeatedlyStateMachine.forever(AfterPaneStateMachine.elementCountAtLeast(2)),
              Sessions.withGapDuration(Duration.millis(10)));
  
      tester.injectElements(1);
      IntervalWindow firstWindow = new IntervalWindow(new Instant(1), new Instant(11));
      assertFalse(tester.shouldFire(firstWindow));
  
      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));
      assertTrue(tester.shouldFire(mergedWindow));
    }
  
    @Test
    public void testRepeatedlyAfterFirstElementCount() throws Exception {
      SimpleTriggerStateMachineTester<GlobalWindow> tester =
          TriggerStateMachineTester.forTrigger(
              RepeatedlyStateMachine.forever(
                  AfterFirstStateMachine.of(
                      AfterProcessingTimeStateMachine.pastFirstElementInPane()
                          .plusDelayOf(Duration.standardMinutes(15)),
                      AfterPaneStateMachine.elementCountAtLeast(5))),
              new GlobalWindows());
  
      GlobalWindow window = GlobalWindow.INSTANCE;
  
      tester.injectElements(1);
      assertFalse(tester.shouldFire(window));
  
      tester.injectElements(2, 3, 4, 5);
      assertTrue(tester.shouldFire(window));
      tester.fireIfShouldFire(window);
      assertFalse(tester.shouldFire(window));
    }
  
    @Test
    public void testRepeatedlyAfterFirstProcessingTime() throws Exception {
      SimpleTriggerStateMachineTester<GlobalWindow> tester =
          TriggerStateMachineTester.forTrigger(
              RepeatedlyStateMachine.forever(
                  AfterFirstStateMachine.of(
                      AfterProcessingTimeStateMachine.pastFirstElementInPane()
                          .plusDelayOf(Duration.standardMinutes(15)),
                      AfterPaneStateMachine.elementCountAtLeast(5))),
              new GlobalWindows());
  
      GlobalWindow window = GlobalWindow.INSTANCE;
  
      tester.injectElements(1);
      assertFalse(tester.shouldFire(window));
  
      tester.advanceProcessingTime(new Instant(0).plus(Duration.standardMinutes(15)));
      assertTrue(tester.shouldFire(window));
      tester.fireIfShouldFire(window);
      assertFalse(tester.shouldFire(window));
    }
  
    @Test
    public void testRepeatedlyElementCount() throws Exception {
      SimpleTriggerStateMachineTester<GlobalWindow> tester =
          TriggerStateMachineTester.forTrigger(
              RepeatedlyStateMachine.forever(AfterPaneStateMachine.elementCountAtLeast(5)),
              new GlobalWindows());
  
      GlobalWindow window = GlobalWindow.INSTANCE;
  
      tester.injectElements(1);
      assertFalse(tester.shouldFire(window));
  
      tester.injectElements(2, 3, 4, 5);
      assertTrue(tester.shouldFire(window));
      tester.fireIfShouldFire(window);
      assertFalse(tester.shouldFire(window));
    }
  
    @Test
    public void testRepeatedlyProcessingTime() throws Exception {
      SimpleTriggerStateMachineTester<GlobalWindow> tester =
          TriggerStateMachineTester.forTrigger(
              RepeatedlyStateMachine.forever(
                  AfterProcessingTimeStateMachine.pastFirstElementInPane()
                      .plusDelayOf(Duration.standardMinutes(15))),
              new GlobalWindows());
  
      GlobalWindow window = GlobalWindow.INSTANCE;
  
      tester.injectElements(1);
      assertFalse(tester.shouldFire(window));
  
      tester.advanceProcessingTime(new Instant(0).plus(Duration.standardMinutes(15)));
      assertTrue(tester.shouldFire(window));
      tester.fireIfShouldFire(window);
      assertFalse(tester.shouldFire(window));
    }
  
    @Test
    public void testToString() {
      TriggerStateMachine trigger =
          RepeatedlyStateMachine.forever(StubTriggerStateMachine.named("innerTrigger"));
      assertEquals("Repeatedly.forever(innerTrigger)", trigger.toString());
    }
  }
  