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.sdk.extensions.euphoria.core.testkit;
  
  import static java.util.Arrays.asList;
  
  import java.io.Serializable;
  import java.util.List;
  import java.util.Objects;
  import org.apache.beam.sdk.extensions.euphoria.core.client.operator.AssignEventTime;
  import org.apache.beam.sdk.extensions.euphoria.core.client.operator.TopPerKey;
  import org.apache.beam.sdk.extensions.euphoria.core.client.util.Triple;
  import org.apache.beam.sdk.transforms.windowing.DefaultTrigger;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.joda.time.Duration;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Correctness tests of {@link TopPerKey}. */
  @RunWith(JUnit4.class)
  public class TopPerKeyTest extends AbstractOperatorTest {
  
    @Test
    public void testAllInOneWindow() {
      execute(
          new AbstractTestCase<Item, Triple<String, String, Integer>>() {
  
            @Override
            protected PCollection<Triple<String, String, Integer>> getOutput(
                PCollection<Item> input) {
              final PCollection<Item> timestampedElements =
                  AssignEventTime.of(input).using(Item::getTimestamp).output();
              return TopPerKey.of(timestampedElements)
                  .keyBy(Item::getKey)
                  .valueBy(Item::getValue)
                  .scoreBy(Item::getScore)
                  .windowBy(FixedWindows.of(Duration.millis(10)))
                  .triggeredBy(DefaultTrigger.of())
                  .discardingFiredPanes()
                  .withAllowedLateness(Duration.ZERO)
                  .output();
            }
  
            @Override
            public List<Triple<String, String, Integer>> getUnorderedOutput() {
              return asList(
                  Triple.of("one", "one-999", 999),
                  Triple.of("two", "two", 10),
                  Triple.of("three", "3-three", 2));
            }
  
            @Override
            protected List<Item> getInput() {
              return asList(
                  new Item("one", "one-ZZZ-1", 1, 0L),
                  new Item("one", "one-ZZZ-2", 2, 1L),
                  new Item("one", "one-3", 3, 2L),
                  new Item("one", "one-999", 999, 3L),
                  new Item("two", "two", 10, 4L),
                  new Item("three", "1-three", 1, 5L),
                  new Item("three", "2-three", 0, 6L),
                  new Item("one", "one-XXX-100", 100, 7L),
                  new Item("three", "3-three", 2, 8L));
            }
  
            @Override
            protected TypeDescriptor<Item> getInputType() {
              return new TypeDescriptor<Item>() {};
            }
          });
    }
  
    @Test
    public void testTwoWindows() {
      execute(
          new AbstractTestCase<Item, Triple<String, String, Integer>>() {
  
            @Override
            protected PCollection<Triple<String, String, Integer>> getOutput(
                PCollection<Item> input) {
              final PCollection<Item> timestampedElements =
                  AssignEventTime.of(input).using(Item::getTimestamp).output();
              return TopPerKey.of(timestampedElements)
                  .keyBy(Item::getKey)
                  .valueBy(Item::getValue)
                  .scoreBy(Item::getScore)
                  .windowBy(FixedWindows.of(Duration.millis(10)))
                  .triggeredBy(DefaultTrigger.of())
                  .discardingFiredPanes()
                  .withAllowedLateness(Duration.ZERO)
                  .output();
            }
  
            @Override
            public List<Triple<String, String, Integer>> getUnorderedOutput() {
              return asList(
                  // first window
                  Triple.of("one", "one-999", 999),
                  Triple.of("two", "two", 10),
                  Triple.of("three", "3-three", 2),
                  // second window
                  Triple.of("one", "one-XXX-100", 100),
                  Triple.of("three", "2-three", 0));
            }
  
            @Override
            protected List<Item> getInput() {
              return asList(
                  new Item("one", "one-ZZZ-1", 1, 14L),
                  new Item("one", "one-ZZZ-2", 2, 1L),
                  new Item("one", "one-3", 3, 13L),
                  new Item("one", "one-999", 999, 3L),
                  new Item("two", "two", 10, 4L),
                  new Item("three", "1-three", 1, 5L),
                  new Item("three", "2-three", 0, 16L),
                  new Item("one", "one-XXX-100", 100, 12L),
                  new Item("three", "3-three", 2, 8L));
            }
  
            @Override
            protected TypeDescriptor<Item> getInputType() {
              return new TypeDescriptor<Item>() {};
            }
          });
    }
  
    static final class Item implements Serializable {
  
      private final String key, value;
      private final int score;
      private final long timestamp;
  
      Item(String key, String value, int score, long timestamp) {
        this.key = key;
        this.value = value;
        this.score = score;
        this.timestamp = timestamp;
      }
  
      String getKey() {
        return key;
      }
  
      String getValue() {
        return value;
      }
  
      int getScore() {
        return score;
      }
  
      long getTimestamp() {
        return timestamp;
      }
  
      @Override
      public boolean equals(@Nullable Object o) {
        if (this == o) {
          return true;
        }
        if (o == null || getClass() != o.getClass()) {
          return false;
        }
        Item item = (Item) o;
        return score == item.score
            && timestamp == item.timestamp
            && Objects.equals(key, item.key)
            && Objects.equals(value, item.value);
      }
  
      @Override
      public int hashCode() {
        return Objects.hash(key, value, score, timestamp);
      }
    }
  }
  