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.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  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.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link AfterAllStateMachine}. */
  @RunWith(JUnit4.class)
  public class AfterAllStateMachineTest {
  
    private SimpleTriggerStateMachineTester<IntervalWindow> tester;
  
    @Test
    public void testT1FiresFirst() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterAllStateMachine.of(
                  AfterPaneStateMachine.elementCountAtLeast(1),
                  AfterPaneStateMachine.elementCountAtLeast(2)),
              FixedWindows.of(Duration.millis(100)));
  
      IntervalWindow window = new IntervalWindow(new Instant(0), new Instant(100));
  
      tester.injectElements(1);
      assertFalse(tester.shouldFire(window));
  
      tester.injectElements(2);
      assertTrue(tester.shouldFire(window));
      tester.fireIfShouldFire(window);
      assertTrue(tester.isMarkedFinished(window));
    }
  
    @Test
    public void testT2FiresFirst() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterAllStateMachine.of(
                  AfterPaneStateMachine.elementCountAtLeast(2),
                  AfterPaneStateMachine.elementCountAtLeast(1)),
              FixedWindows.of(Duration.millis(100)));
  
      IntervalWindow window = new IntervalWindow(new Instant(0), new Instant(100));
  
      tester.injectElements(1);
      assertFalse(tester.shouldFire(window));
  
      tester.injectElements(2);
      assertTrue(tester.shouldFire(window));
      tester.fireIfShouldFire(window);
      assertTrue(tester.isMarkedFinished(window));
    }
  
    /**
     * Tests that the AfterAll properly unsets finished bits when a merge causing it to become
     * unfinished.
     */
    @Test
    public void testOnMergeRewinds() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterEachStateMachine.inOrder(
                  AfterAllStateMachine.of(
                      AfterWatermarkStateMachine.pastEndOfWindow(),
                      AfterPaneStateMachine.elementCountAtLeast(1)),
                  RepeatedlyStateMachine.forever(AfterPaneStateMachine.elementCountAtLeast(1))),
              Sessions.withGapDuration(Duration.millis(10)));
  
      tester.injectElements(1);
      IntervalWindow firstWindow = new IntervalWindow(new Instant(1), new Instant(11));
  
      tester.injectElements(5);
      IntervalWindow secondWindow = new IntervalWindow(new Instant(5), new Instant(15));
  
      // Finish the AfterAll in the first window
      tester.advanceInputWatermark(new Instant(11));
      assertTrue(tester.shouldFire(firstWindow));
      assertFalse(tester.shouldFire(secondWindow));
      tester.fireIfShouldFire(firstWindow);
  
      // Merge them; the AfterAll should not be finished
      tester.mergeWindows();
      IntervalWindow mergedWindow = new IntervalWindow(new Instant(1), new Instant(15));
      assertFalse(tester.isMarkedFinished(mergedWindow));
  
      // Confirm that we are back on the first trigger by probing that it is not ready to fire
      // after an element (with merging)
      tester.injectElements(3);
      tester.mergeWindows();
      assertFalse(tester.shouldFire(mergedWindow));
  
      // Fire the AfterAll in the merged window
      tester.advanceInputWatermark(new Instant(15));
      assertTrue(tester.shouldFire(mergedWindow));
      tester.fireIfShouldFire(mergedWindow);
  
      // Confirm that we are on the second trigger by probing
      tester.injectElements(2);
      tester.mergeWindows();
      assertTrue(tester.shouldFire(mergedWindow));
      tester.fireIfShouldFire(mergedWindow);
      tester.injectElements(2);
      tester.mergeWindows();
      assertTrue(tester.shouldFire(mergedWindow));
      tester.fireIfShouldFire(mergedWindow);
    }
  
    @Test
    public void testToString() {
      TriggerStateMachine trigger =
          AfterAllStateMachine.of(
              StubTriggerStateMachine.named("t1"), StubTriggerStateMachine.named("t2"));
      assertEquals("AfterAll.of(t1, t2)", trigger.toString());
    }
  }
  