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.flink.translation.wrappers.streaming;
  
  import static org.apache.beam.runners.flink.translation.wrappers.streaming.StreamRecordStripper.stripStreamRecordFromWindowedValue;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.collection.IsIterableContainingInOrder.contains;
  
  import java.nio.ByteBuffer;
  import java.nio.charset.StandardCharsets;
  import org.apache.beam.runners.flink.translation.wrappers.streaming.io.DedupingOperator;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.sdk.values.ValueWithRecordId;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.apache.flink.api.common.typeinfo.TypeInformation;
  import org.apache.flink.runtime.checkpoint.OperatorSubtaskState;
  import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
  import org.apache.flink.streaming.util.KeyedOneInputStreamOperatorTestHarness;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link DedupingOperator}. */
  @RunWith(JUnit4.class)
  public class DedupingOperatorTest {
  
    @Test
    public void testDeduping() throws Exception {
  
      KeyedOneInputStreamOperatorTestHarness<
              ByteBuffer, WindowedValue<ValueWithRecordId<String>>, WindowedValue<String>>
          harness = getDebupingHarness();
  
      harness.open();
  
      String key1 = "key1";
      String key2 = "key2";
  
      harness.processElement(
          new StreamRecord<>(
              WindowedValues.valueInGlobalWindow(
                  new ValueWithRecordId<>(key1, key1.getBytes(StandardCharsets.UTF_8)))));
  
      harness.processElement(
          new StreamRecord<>(
              WindowedValues.valueInGlobalWindow(
                  new ValueWithRecordId<>(key2, key2.getBytes(StandardCharsets.UTF_8)))));
  
      harness.processElement(
          new StreamRecord<>(
              WindowedValues.valueInGlobalWindow(
                  new ValueWithRecordId<>(key1, key1.getBytes(StandardCharsets.UTF_8)))));
  
      assertThat(
          stripStreamRecordFromWindowedValue(harness.getOutput()),
          contains(
              WindowedValues.valueInGlobalWindow(key1), WindowedValues.valueInGlobalWindow(key2)));
  
      OperatorSubtaskState snapshot = harness.snapshot(0L, 0L);
  
      harness.close();
  
      harness = getDebupingHarness();
      harness.setup();
      harness.initializeState(snapshot);
      harness.open();
  
      String key3 = "key3";
  
      harness.processElement(
          new StreamRecord<>(
              WindowedValues.valueInGlobalWindow(
                  new ValueWithRecordId<>(key2, key2.getBytes(StandardCharsets.UTF_8)))));
  
      harness.processElement(
          new StreamRecord<>(
              WindowedValues.valueInGlobalWindow(
                  new ValueWithRecordId<>(key3, key3.getBytes(StandardCharsets.UTF_8)))));
  
      assertThat(
          stripStreamRecordFromWindowedValue(harness.getOutput()),
          contains(WindowedValues.valueInGlobalWindow(key3)));
  
      harness.close();
    }
  
    private KeyedOneInputStreamOperatorTestHarness<
            ByteBuffer, WindowedValue<ValueWithRecordId<String>>, WindowedValue<String>>
        getDebupingHarness() throws Exception {
      DedupingOperator<String> operator = new DedupingOperator<>(PipelineOptionsFactory.create());
  
      return new KeyedOneInputStreamOperatorTestHarness<>(
          operator,
          value -> ByteBuffer.wrap(value.getValue().getId()),
          TypeInformation.of(ByteBuffer.class));
    }
  }
  