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.transforms;
  
  import com.google.api.services.dataflow.Dataflow;
  import org.apache.beam.runners.dataflow.DataflowRunner;
  import org.apache.beam.runners.dataflow.options.DataflowPipelineOptions;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.coders.KvCoder;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.coders.VarIntCoder;
  import org.apache.beam.sdk.extensions.gcp.storage.NoopPathValidator;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.sdk.transforms.GroupByKey;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PBegin;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.WindowingStrategy;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.Mock;
  import org.mockito.MockitoAnnotations;
  
  /** Tests for {@link GroupByKey} for the {@link DataflowRunner}. */
  @RunWith(JUnit4.class)
  public class DataflowGroupByKeyTest {
    @Rule public ExpectedException thrown = ExpectedException.none();
  
    @Mock private Dataflow dataflow;
  
    @Before
    public void setUp() {
      MockitoAnnotations.initMocks(this);
    }
  
    /**
     * Create a test pipeline that uses the {@link DataflowRunner} so that {@link GroupByKey} is not
     * expanded. This is used for verifying that even without expansion the proper errors show up.
     */
    private Pipeline createTestServiceRunner() {
      DataflowPipelineOptions options = PipelineOptionsFactory.as(DataflowPipelineOptions.class);
      options.setRunner(DataflowRunner.class);
      options.setProject("someproject");
      options.setRegion("some-region1");
      options.setGcpTempLocation("gs://staging");
      options.setPathValidatorClass(NoopPathValidator.class);
      options.setDataflowClient(dataflow);
      return Pipeline.create(options);
    }
  
    @Test
    public void testGroupByKeyServiceUnbounded() {
      Pipeline p = createTestServiceRunner();
  
      PCollection<KV<String, Integer>> input =
          p.apply(
              new PTransform<PBegin, PCollection<KV<String, Integer>>>() {
                @Override
                public PCollection<KV<String, Integer>> expand(PBegin input) {
                  return PCollection.createPrimitiveOutputInternal(
                      input.getPipeline(),
                      WindowingStrategy.globalDefault(),
                      PCollection.IsBounded.UNBOUNDED,
                      KvCoder.of(StringUtf8Coder.of(), VarIntCoder.of()));
                }
              });
  
      thrown.expect(IllegalStateException.class);
      thrown.expectMessage(
          "GroupByKey cannot be applied to non-bounded PCollection in the GlobalWindow without "
              + "a trigger. Use a Window.into or Window.triggering transform prior to GroupByKey.");
  
      input.apply("GroupByKey", GroupByKey.create());
    }
  }
  