runtime/executor/src/test/java/org/apache/nemo/runtime/executor/datatransfer/InputWatermarkManagerTest.java

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.nemo.runtime.executor.datatransfer;

import org.apache.nemo.common.ir.vertex.OperatorVertex;
import org.apache.nemo.common.ir.vertex.transform.Transform;
import org.apache.nemo.common.punctuation.Watermark;
import org.junit.Test;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

import java.util.LinkedList;
import java.util.List;

import static org.junit.Assert.assertEquals;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.mock;

public final class InputWatermarkManagerTest {

  @Test
  public void test() {
    final List<Watermark> emittedWatermarks = new LinkedList<>();
    final Transform transform = mock(Transform.class);
    doAnswer(new Answer<Void>() {
      @Override
      public Void answer(InvocationOnMock invocationOnMock) throws Throwable {
        final Watermark watermark = invocationOnMock.getArgument(0);
        emittedWatermarks.add(watermark);
        return null;
      }
    }).when(transform).onWatermark(any(Watermark.class));

    final OperatorVertex operatorVertex = new OperatorVertex(transform);
    final InputWatermarkManager watermarkManager =
      new MultiInputWatermarkManager(3, new OperatorWatermarkCollector(operatorVertex));

    //edge1: 10 s
    //edge2: 5 s
    //edge3: 8 s
    //current min watermark: 5 s
    watermarkManager.trackAndEmitWatermarks(0, new Watermark(10));
    assertEquals(0, emittedWatermarks.size());
    watermarkManager.trackAndEmitWatermarks(1, new Watermark(5));
    assertEquals(0, emittedWatermarks.size());
    watermarkManager.trackAndEmitWatermarks(2, new Watermark(8));
    assertEquals(5, emittedWatermarks.get(0).getTimestamp());
    emittedWatermarks.clear();

    //edge1: 13
    //edge2: 9
    //edge3: 8
    //current min watermark: 8
    watermarkManager.trackAndEmitWatermarks(0, new Watermark(13));
    assertEquals(0, emittedWatermarks.size());
    watermarkManager.trackAndEmitWatermarks(1, new Watermark(9));
    assertEquals(8, emittedWatermarks.get(0).getTimestamp());
    emittedWatermarks.clear();

    //edge1: 13
    //edge2: 15
    //edge3: 8
    //current min watermark: 8
    watermarkManager.trackAndEmitWatermarks(1, new Watermark(15));
    assertEquals(0, emittedWatermarks.size());

    //edge1: 13
    //edge2: 15
    //edge3: 17
    //current min watermark: 13
    watermarkManager.trackAndEmitWatermarks(2, new Watermark(17));
    assertEquals(13, emittedWatermarks.get(0).getTimestamp());
  }
}