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.dataflow.worker.util;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.instanceOf;
  
  import org.apache.beam.runners.core.InMemoryStateInternals;
  import org.apache.beam.runners.core.StateInternals;
  import org.apache.beam.runners.core.StateInternalsFactory;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.coders.CoderRegistry;
  import org.apache.beam.sdk.coders.KvCoder;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.coders.VarLongCoder;
  import org.apache.beam.sdk.transforms.Sum;
  import org.apache.beam.sdk.transforms.windowing.AfterPane;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
  import org.apache.beam.sdk.transforms.windowing.ReshuffleTrigger;
  import org.apache.beam.sdk.transforms.windowing.Sessions;
  import org.apache.beam.sdk.util.AppliedCombineFn;
  import org.apache.beam.sdk.values.WindowingStrategy;
  import org.joda.time.Duration;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /**
   * Unit tests for the static factory methods in the factory class {@link
   * BatchGroupAlsoByWindowsDoFns}.
   */
  @RunWith(JUnit4.class)
  public class BatchGroupAlsoByWindowFnsTest {
  
    private static class InMemoryStateInternalsFactory<K> implements StateInternalsFactory<K> {
      @Override
      public StateInternals stateInternalsForKey(K key) {
        return InMemoryStateInternals.forKey(key);
      }
    }
  
    @Test
    public void testCreateNoncombiningNonmerging() throws Exception {
      Coder<Long> inputCoder = VarLongCoder.of();
      WindowingStrategy<?, IntervalWindow> windowingStrategy =
          WindowingStrategy.of(FixedWindows.of(Duration.millis(10)));
  
      assertThat(
          BatchGroupAlsoByWindowsDoFns.createForIterable(
              windowingStrategy, new InMemoryStateInternalsFactory<>(), inputCoder),
          instanceOf(BatchGroupAlsoByWindowViaIteratorsFn.class));
    }
  
    @Test
    public void testCreateNoncombiningMerging() throws Exception {
      Coder<Long> inputCoder = VarLongCoder.of();
      WindowingStrategy<?, IntervalWindow> windowingStrategy =
          WindowingStrategy.of(Sessions.withGapDuration(Duration.millis(10)));
  
      assertThat(
          BatchGroupAlsoByWindowsDoFns.createForIterable(
              windowingStrategy, new InMemoryStateInternalsFactory<>(), inputCoder),
          instanceOf(BatchGroupAlsoByWindowViaOutputBufferFn.class));
    }
  
    @Test
    public void testCreateNoncombiningWithTrigger() throws Exception {
      Coder<Long> inputCoder = VarLongCoder.of();
      WindowingStrategy<?, IntervalWindow> windowingStrategy =
          WindowingStrategy.of(FixedWindows.of(Duration.millis(10)))
              .withTrigger(AfterPane.elementCountAtLeast(1));
  
      assertThat(
          BatchGroupAlsoByWindowsDoFns.createForIterable(
              windowingStrategy, new InMemoryStateInternalsFactory<>(), inputCoder),
          instanceOf(BatchGroupAlsoByWindowViaIteratorsFn.class));
    }
  
    @Test
    public void testCreateCombiningNonmerging() throws Exception {
      AppliedCombineFn<String, Long, ?, Long> appliedFn =
          AppliedCombineFn.withInputCoder(
              Sum.ofLongs(),
              CoderRegistry.createDefault(),
              KvCoder.of(StringUtf8Coder.of(), VarLongCoder.of()));
      WindowingStrategy<?, IntervalWindow> windowingStrategy =
          WindowingStrategy.of(FixedWindows.of(Duration.millis(10)));
  
      assertThat(
          BatchGroupAlsoByWindowsDoFns.create(windowingStrategy, appliedFn),
          instanceOf(BatchGroupAlsoByWindowAndCombineFn.class));
    }
  
    @Test
    public void testCreateCombiningMerging() throws Exception {
      AppliedCombineFn<String, Long, ?, Long> appliedFn =
          AppliedCombineFn.withInputCoder(
              Sum.ofLongs(),
              CoderRegistry.createDefault(),
              KvCoder.of(StringUtf8Coder.of(), VarLongCoder.of()));
      WindowingStrategy<?, IntervalWindow> windowingStrategy =
          WindowingStrategy.of(Sessions.withGapDuration(Duration.millis(10)));
  
      assertThat(
          BatchGroupAlsoByWindowsDoFns.create(windowingStrategy, appliedFn),
          instanceOf(BatchGroupAlsoByWindowAndCombineFn.class));
    }
  
    @Test
    public void testCreateCombiningWithTrigger() throws Exception {
      AppliedCombineFn<String, Long, ?, Long> appliedFn =
          AppliedCombineFn.withInputCoder(
              Sum.ofLongs(),
              CoderRegistry.createDefault(),
              KvCoder.of(StringUtf8Coder.of(), VarLongCoder.of()));
      WindowingStrategy<?, IntervalWindow> windowingStrategy =
          WindowingStrategy.of(Sessions.withGapDuration(Duration.millis(10)))
              .withTrigger(AfterPane.elementCountAtLeast(1));
  
      assertThat(
          BatchGroupAlsoByWindowsDoFns.create(windowingStrategy, appliedFn),
          instanceOf(BatchGroupAlsoByWindowAndCombineFn.class));
    }
  
    @Test
    public void testCreateNoncombiningReshuffle() throws Exception {
      Coder<Long> inputCoder = VarLongCoder.of();
      WindowingStrategy<?, IntervalWindow> windowingStrategy =
          WindowingStrategy.of(FixedWindows.of(Duration.millis(10)))
              .withTrigger(new ReshuffleTrigger<>());
  
      assertThat(
          BatchGroupAlsoByWindowsDoFns.createForIterable(
              windowingStrategy, new InMemoryStateInternalsFactory<Long>(), inputCoder),
          instanceOf(BatchGroupAlsoByWindowReshuffleFn.class));
    }
  }
  