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.containsInAnyOrder;
  import static org.hamcrest.Matchers.nullValue;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import org.apache.beam.sdk.coders.KvCoder;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.coders.VoidCoder;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.GroupByKey;
  import org.apache.beam.sdk.transforms.Values;
  import org.apache.beam.sdk.transforms.View;
  import org.apache.beam.sdk.transforms.WithKeys;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollectionView;
  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.ImmutableList;
  import org.joda.time.Instant;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link ViewEvaluatorFactory}. */
  @RunWith(JUnit4.class)
  public class ViewEvaluatorFactoryTest {
    private BundleFactory bundleFactory = ImmutableListBundleFactory.create();
  
    @Rule public TestPipeline p = TestPipeline.create().enableAbandonedNodeEnforcement(false);
  
    @Test
    public void testInMemoryEvaluator() throws Exception {
      PCollection<String> input = p.apply(Create.of("foo", "bar"));
      PCollectionView<Iterable<String>> pCollectionView = input.apply(View.asIterable());
      PCollection<Iterable<String>> concat =
          input
              .apply(WithKeys.of((Void) null))
              .setCoder(KvCoder.of(VoidCoder.of(), StringUtf8Coder.of()))
              .apply(GroupByKey.create())
              .apply(Values.create());
      PCollection<Iterable<String>> view =
          concat.apply(new DirectWriteViewVisitor.WriteView<>(pCollectionView));
  
      EvaluationContext context = mock(EvaluationContext.class);
      TestViewWriter<String, Iterable<String>> viewWriter = new TestViewWriter<>();
      when(context.createPCollectionViewWriter(concat, pCollectionView)).thenReturn(viewWriter);
  
      CommittedBundle<String> inputBundle = bundleFactory.createBundle(input).commit(Instant.now());
      AppliedPTransform<?, ?, ?> producer = DirectGraphs.getProducer(view);
      TransformEvaluator<Iterable<String>> evaluator =
          new ViewEvaluatorFactory(context).forApplication(producer, inputBundle);
  
      evaluator.processElement(WindowedValues.valueInGlobalWindow(ImmutableList.of("foo", "bar")));
      assertThat(viewWriter.latest, nullValue());
  
      evaluator.finishBundle();
      assertThat(
          viewWriter.latest,
          containsInAnyOrder(
              WindowedValues.valueInGlobalWindow("foo"), WindowedValues.valueInGlobalWindow("bar")));
    }
  
    private static class TestViewWriter<ElemT, ViewT> implements PCollectionViewWriter<ElemT, ViewT> {
      private Iterable<WindowedValue<ElemT>> latest;
  
      @Override
      public void add(Iterable<WindowedValue<ElemT>> values) {
        latest = values;
      }
    }
  }
  