samza-core/src/test/java/org/apache/samza/container/grouper/stream/TestGroupBySystemStreamPartition.java

/*
 * 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.samza.container.grouper.stream;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.samza.Partition;
import org.apache.samza.config.Config;
import org.apache.samza.config.MapConfig;
import org.apache.samza.container.TaskName;
import org.apache.samza.system.SystemStreamPartition;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;


public class TestGroupBySystemStreamPartition {
  private SystemStreamPartition aa0 = new SystemStreamPartition("SystemA", "StreamA", new Partition(0));
  private SystemStreamPartition aa1 = new SystemStreamPartition("SystemA", "StreamA", new Partition(1));
  private SystemStreamPartition aa2 = new SystemStreamPartition("SystemA", "StreamA", new Partition(2));
  private SystemStreamPartition ac0 = new SystemStreamPartition("SystemA", "StreamB", new Partition(0));
  private GroupBySystemStreamPartitionFactory grouperFactory = new GroupBySystemStreamPartitionFactory();

  @Test
  public void testLocalStreamGroupedCorrectly() {
    SystemStreamPartitionGrouper grouper = grouperFactory.getSystemStreamPartitionGrouper(new MapConfig());
    Map<TaskName, Set<SystemStreamPartition>> emptyResult = grouper.group(new HashSet<>());
    assertTrue(emptyResult.isEmpty());

    Map<TaskName, Set<SystemStreamPartition>> result = grouper.group(ImmutableSet.of(aa0, aa1, aa2, ac0));
    Map<TaskName, Set<SystemStreamPartition>> expectedResult = ImmutableMap.<TaskName, Set<SystemStreamPartition>>builder()
                .put(new TaskName(aa0.toString()), ImmutableSet.of(aa0))
                .put(new TaskName(aa1.toString()), ImmutableSet.of(aa1))
                .put(new TaskName(aa2.toString()), ImmutableSet.of(aa2))
                .put(new TaskName(ac0.toString()), ImmutableSet.of(ac0))
                .build();

    assertEquals(expectedResult, result);
  }

  @Test
  public void testBroadcastStreamGroupedCorrectly() {
    Config config = new MapConfig(ImmutableMap.of("task.broadcast.inputs", "SystemA.StreamA#0"));

    SystemStreamPartitionGrouper grouper = new GroupBySystemStreamPartition(config);
    Map<TaskName, Set<SystemStreamPartition>> result = grouper.group(ImmutableSet.of(aa0, aa1, aa2, ac0));

    Map<TaskName, Set<SystemStreamPartition>> expectedResult = ImmutableMap.<TaskName, Set<SystemStreamPartition>>builder()
            .put(new TaskName(aa1.toString()), ImmutableSet.of(aa1, aa0))
            .put(new TaskName(aa2.toString()), ImmutableSet.of(aa2, aa0))
            .put(new TaskName(ac0.toString()), ImmutableSet.of(ac0, aa0))
            .build();

    assertEquals(expectedResult, result);
  }

  @Test
  public void testElasticityEnabledLocalStreamGroupedCorrectly() {
    Config config = new MapConfig(ImmutableMap.of("job.elasticity.factor", "2"));
    SystemStreamPartitionGrouper grouper = grouperFactory.getSystemStreamPartitionGrouper(config);
    Map<TaskName, Set<SystemStreamPartition>> emptyResult = grouper.group(new HashSet<>());
    assertTrue(emptyResult.isEmpty());

    Map<TaskName, Set<SystemStreamPartition>> result = grouper.group(ImmutableSet.of(aa0, aa1, aa2, ac0));
    Map<TaskName, Set<SystemStreamPartition>> expectedResult = ImmutableMap.<TaskName, Set<SystemStreamPartition>>builder()
        .put(new TaskName(new SystemStreamPartition(aa0, 0).toString()), ImmutableSet.of(new SystemStreamPartition(aa0, 0)))
        .put(new TaskName(new SystemStreamPartition(aa0, 1).toString()), ImmutableSet.of(new SystemStreamPartition(aa0, 1)))
        .put(new TaskName(new SystemStreamPartition(aa1, 0).toString()), ImmutableSet.of(new SystemStreamPartition(aa1, 0)))
        .put(new TaskName(new SystemStreamPartition(aa1, 1).toString()), ImmutableSet.of(new SystemStreamPartition(aa1, 1)))
        .put(new TaskName(new SystemStreamPartition(aa2, 0).toString()), ImmutableSet.of(new SystemStreamPartition(aa2, 0)))
        .put(new TaskName(new SystemStreamPartition(aa2, 1).toString()), ImmutableSet.of(new SystemStreamPartition(aa2, 1)))
        .put(new TaskName(new SystemStreamPartition(ac0, 0).toString()), ImmutableSet.of(new SystemStreamPartition(ac0, 0)))
        .put(new TaskName(new SystemStreamPartition(ac0, 1).toString()), ImmutableSet.of(new SystemStreamPartition(ac0, 1)))
        .build();

    assertEquals(expectedResult, result);
  }
}