samza-core/src/test/java/org/apache/samza/container/grouper/task/TestTaskPartitionAssignmentManager.java

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 * 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
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 * Unless required by applicable law or agreed to in writing,
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package org.apache.samza.container.grouper.task;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.util.List;
import java.util.Map;
import org.apache.samza.config.Config;
import org.apache.samza.config.MapConfig;
import org.apache.samza.coordinator.metadatastore.CoordinatorStreamStore;
import org.apache.samza.coordinator.metadatastore.CoordinatorStreamStoreTestUtil;
import org.apache.samza.coordinator.metadatastore.NamespaceAwareCoordinatorStreamStore;
import org.apache.samza.coordinator.stream.MockCoordinatorStreamSystemFactory;
import org.apache.samza.Partition;
import org.apache.samza.coordinator.stream.messages.SetTaskPartitionMapping;
import org.apache.samza.system.SystemStreamPartition;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

public class TestTaskPartitionAssignmentManager {

  private static final String TEST_SYSTEM = "system";
  private static final String TEST_STREAM = "stream";
  private static final Partition PARTITION = new Partition(0);
  private static final Config CONFIG = new MapConfig(ImmutableMap.of("job.name", "test-job", "job.coordinator.system", "test-kafka"));

  private final SystemStreamPartition testSystemStreamPartition = new SystemStreamPartition(TEST_SYSTEM, TEST_STREAM, PARTITION);

  private TaskPartitionAssignmentManager taskPartitionAssignmentManager;

  @Before
  public void setup() {
    CoordinatorStreamStoreTestUtil coordinatorStreamStoreTestUtil = new CoordinatorStreamStoreTestUtil(CONFIG);
    CoordinatorStreamStore coordinatorStreamStore = coordinatorStreamStoreTestUtil.getCoordinatorStreamStore();
    taskPartitionAssignmentManager = new TaskPartitionAssignmentManager(new NamespaceAwareCoordinatorStreamStore(coordinatorStreamStore, SetTaskPartitionMapping.TYPE));
  }

  @After
  public void tearDown() {
    MockCoordinatorStreamSystemFactory.disableMockConsumerCache();
    taskPartitionAssignmentManager.close();
  }

  @Test
  public void testReadAfterWrite() {
    List<String> testTaskNames = ImmutableList.of("test-task1", "test-task2", "test-task3");
    taskPartitionAssignmentManager.writeTaskPartitionAssignments(ImmutableMap.of(testSystemStreamPartition, testTaskNames));

    Map<SystemStreamPartition, List<String>> expectedMapping = ImmutableMap.of(testSystemStreamPartition, testTaskNames);
    Map<SystemStreamPartition, List<String>> actualMapping = taskPartitionAssignmentManager.readTaskPartitionAssignments();

    Assert.assertEquals(expectedMapping, actualMapping);
  }

  @Test
  public void testDeleteAfterWrite() {
    List<String> testTaskNames = ImmutableList.of("test-task1", "test-task2", "test-task3");
    taskPartitionAssignmentManager.writeTaskPartitionAssignments(ImmutableMap.of(testSystemStreamPartition, testTaskNames));

    Map<SystemStreamPartition, List<String>> actualMapping = taskPartitionAssignmentManager.readTaskPartitionAssignments();
    Assert.assertEquals(1, actualMapping.size());

    taskPartitionAssignmentManager.delete(ImmutableList.of(testSystemStreamPartition));

    actualMapping = taskPartitionAssignmentManager.readTaskPartitionAssignments();
    Assert.assertEquals(0, actualMapping.size());
  }

  @Test
  public void testReadPartitionAssignments() {
    SystemStreamPartition testSystemStreamPartition1 = new SystemStreamPartition(TEST_SYSTEM, TEST_STREAM, PARTITION);
    List<String> testTaskNames1 = ImmutableList.of("test-task1", "test-task2", "test-task3");
    SystemStreamPartition testSystemStreamPartition2 = new SystemStreamPartition(TEST_SYSTEM, "stream-2", PARTITION);
    List<String> testTaskNames2 = ImmutableList.of("test-task4", "test-task5");
    SystemStreamPartition testSystemStreamPartition3 = new SystemStreamPartition(TEST_SYSTEM, "stream-3", PARTITION);
    List<String> testTaskNames3 = ImmutableList.of("test-task6", "test-task7", "test-task8");

    taskPartitionAssignmentManager.writeTaskPartitionAssignments(
        ImmutableMap.of(testSystemStreamPartition1, testTaskNames1, testSystemStreamPartition2, testTaskNames2,
            testSystemStreamPartition3, testTaskNames3));

    Map<SystemStreamPartition, List<String>> expectedMapping =
        ImmutableMap.of(testSystemStreamPartition1, testTaskNames1, testSystemStreamPartition2, testTaskNames2,
            testSystemStreamPartition3, testTaskNames3);
    Map<SystemStreamPartition, List<String>> actualMapping = taskPartitionAssignmentManager.readTaskPartitionAssignments();

    Assert.assertEquals(expectedMapping, actualMapping);
  }

  @Test
  public void testMultipleUpdatesReturnsTheMostRecentValue() {
    List<String> testTaskNames1 = ImmutableList.of("test-task1", "test-task2", "test-task3");
    taskPartitionAssignmentManager.writeTaskPartitionAssignments(ImmutableMap.of(testSystemStreamPartition, testTaskNames1));
    List<String> testTaskNames2 = ImmutableList.of("test-task4", "test-task5");
    taskPartitionAssignmentManager.writeTaskPartitionAssignments(ImmutableMap.of(testSystemStreamPartition, testTaskNames2));
    List<String> testTaskNames3 = ImmutableList.of("test-task6", "test-task7", "test-task8");
    taskPartitionAssignmentManager.writeTaskPartitionAssignments(ImmutableMap.of(testSystemStreamPartition, testTaskNames3));

    Map<SystemStreamPartition, List<String>> expectedMapping = ImmutableMap.of(testSystemStreamPartition, testTaskNames3);
    Map<SystemStreamPartition, List<String>> actualMapping = taskPartitionAssignmentManager.readTaskPartitionAssignments();
    Assert.assertEquals(expectedMapping, actualMapping);
  }
}