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.direct;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.contains;
  import static org.hamcrest.Matchers.equalTo;
  import static org.hamcrest.Matchers.hasSize;
  import static org.junit.Assert.assertArrayEquals;
  import static org.mockito.Mockito.when;
  
  import java.util.Collection;
  import org.apache.beam.runners.direct.ImpulseEvaluatorFactory.ImpulseRootProvider;
  import org.apache.beam.runners.direct.ImpulseEvaluatorFactory.ImpulseShard;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.transforms.Impulse;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.transforms.windowing.GlobalWindow;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  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.MockitoAnnotations;
  
  /** Tests for {@link ImpulseEvaluatorFactory}. */
  @RunWith(JUnit4.class)
  public class ImpulseEvaluatorFactoryTest {
    private BundleFactory bundleFactory = ImmutableListBundleFactory.create();
  
    @Mock private EvaluationContext context;
  
    @Before
    public void setup() {
      MockitoAnnotations.initMocks(this);
    }
  
    @Test
    public void testImpulse() throws Exception {
      Pipeline p = Pipeline.create();
      PCollection<byte[]> impulseOut = p.apply(Impulse.create());
  
      AppliedPTransform<?, ?, ?> impulseApplication = DirectGraphs.getProducer(impulseOut);
  
      ImpulseEvaluatorFactory factory = new ImpulseEvaluatorFactory(context);
  
      WindowedValue<ImpulseShard> inputShard = WindowedValues.valueInGlobalWindow(new ImpulseShard());
      CommittedBundle<ImpulseShard> inputShardBundle =
          bundleFactory.<ImpulseShard>createRootBundle().add(inputShard).commit(Instant.now());
  
      when(context.createBundle(impulseOut)).thenReturn(bundleFactory.createBundle(impulseOut));
      TransformEvaluator<ImpulseShard> evaluator =
          factory.forApplication(impulseApplication, inputShardBundle);
      evaluator.processElement(inputShard);
      TransformResult<ImpulseShard> result = evaluator.finishBundle();
      assertThat(
          "Exactly one output from a single ImpulseShard",
          Iterables.size(result.getOutputBundles()),
          equalTo(1));
      UncommittedBundle<?> outputBundle = result.getOutputBundles().iterator().next();
      CommittedBundle<?> committedOutputBundle = outputBundle.commit(Instant.now());
      assertThat(
          committedOutputBundle.getMinimumTimestamp(), equalTo(BoundedWindow.TIMESTAMP_MIN_VALUE));
      assertThat(committedOutputBundle.getPCollection(), equalTo(impulseOut));
      assertThat(
          "Should only be one impulse element",
          Iterables.size(committedOutputBundle.getElements()),
          equalTo(1));
      assertThat(
          committedOutputBundle.getElements().iterator().next().getWindows(),
          contains(GlobalWindow.INSTANCE));
      assertArrayEquals(
          "Output should be an empty byte array",
          new byte[0],
          (byte[]) committedOutputBundle.getElements().iterator().next().getValue());
    }
  
    @Test
    public void testRootProvider() {
      Pipeline p = Pipeline.create();
      PCollection<byte[]> impulseOut = p.apply(Impulse.create());
      // Add a second impulse to demonstrate no crosstalk between applications
      @SuppressWarnings("unused")
      PCollection<byte[]> impulseOutTwo = p.apply(Impulse.create());
      AppliedPTransform<?, ?, ?> impulseApplication = DirectGraphs.getProducer(impulseOut);
  
      ImpulseRootProvider rootProvider = new ImpulseRootProvider(context);
      when(context.createRootBundle()).thenReturn(bundleFactory.createRootBundle());
  
      Collection<CommittedBundle<?>> inputs =
          rootProvider.getInitialInputs((AppliedPTransform) impulseApplication, 100);
  
      assertThat("Only one impulse bundle per application", inputs, hasSize(1));
      assertThat(
          "Only one impulse shard per bundle",
          Iterables.size(inputs.iterator().next().getElements()),
          equalTo(1));
    }
  }
  