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 AfterPaneStateMachine}. */
  @RunWith(JUnit4.class)
  public class AfterPaneStateMachineTest {
  
    SimpleTriggerStateMachineTester<IntervalWindow> tester;
    /**
     * Tests that the trigger does fire when enough elements are in a window, and that it only fires
     * that window (no leakage).
     */
    @Test
    public void testAfterPaneElementCountFixedWindows() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterPaneStateMachine.elementCountAtLeast(2), FixedWindows.of(Duration.millis(10)));
  
      tester.injectElements(1); // [0, 10)
      IntervalWindow window = new IntervalWindow(new Instant(0), new Instant(10));
      assertFalse(tester.shouldFire(window));
  
      tester.injectElements(2); // [0, 10)
      tester.injectElements(11); // [10, 20)
  
      assertTrue(tester.shouldFire(window)); // ready to fire
      tester.fireIfShouldFire(window); // and finished
      assertTrue(tester.isMarkedFinished(window));
  
      // But don't finish the other window
      assertFalse(tester.isMarkedFinished(new IntervalWindow(new Instant(10), new Instant(20))));
    }
  
    @Test
    public void testClear() throws Exception {
      SimpleTriggerStateMachineTester<IntervalWindow> tester =
          TriggerStateMachineTester.forTrigger(
              AfterPaneStateMachine.elementCountAtLeast(2), FixedWindows.of(Duration.millis(10)));
  
      tester.injectElements(1, 2, 3);
      IntervalWindow window = new IntervalWindow(new Instant(0), new Instant(10));
      tester.clearState(window);
      tester.assertCleared(window);
    }
  
    @Test
    public void testAfterPaneElementCountSessions() throws Exception {
      tester =
          TriggerStateMachineTester.forTrigger(
              AfterPaneStateMachine.elementCountAtLeast(2),
              Sessions.withGapDuration(Duration.millis(10)));
  
      tester.injectElements(
          1, // in [1, 11)
          2); // in [2, 12)
  
      assertFalse(tester.shouldFire(new IntervalWindow(new Instant(1), new Instant(11))));
      assertFalse(tester.shouldFire(new IntervalWindow(new Instant(2), new Instant(12))));
  
      tester.mergeWindows();
  
      IntervalWindow mergedWindow = new IntervalWindow(new Instant(1), new Instant(12));
      assertTrue(tester.shouldFire(mergedWindow));
      tester.fireIfShouldFire(mergedWindow);
      assertTrue(tester.isMarkedFinished(mergedWindow));
  
      // Because we closed the previous window, we don't have it around to merge with. So there
      // will be a new FIRE_AND_FINISH result.
      tester.injectElements(
          7, // in [7, 17)
          9); // in [9, 19)
  
      tester.mergeWindows();
  
      IntervalWindow newMergedWindow = new IntervalWindow(new Instant(7), new Instant(19));
      assertTrue(tester.shouldFire(newMergedWindow));
      tester.fireIfShouldFire(newMergedWindow);
      assertTrue(tester.isMarkedFinished(newMergedWindow));
    }
  
    @Test
    public void testToString() {
      TriggerStateMachine trigger = AfterPaneStateMachine.elementCountAtLeast(5);
      assertEquals("AfterPane.elementCountAtLeast(5)", trigger.toString());
    }
  }
  