content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.worker.block.allocator;
  
  import static org.junit.Assert.assertTrue;
  
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.worker.block.BlockMetadataEvictorView;
  import alluxio.worker.block.BlockMetadataView;
  import alluxio.worker.block.TieredBlockStoreTestUtils;
  
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TemporaryFolder;
  
  /**
   * Test {@link Allocator.Factory} by passing different allocate strategy class names with alluxio
   * conf and test if it generates the correct {@link Allocator} instance.
   */
  public final class AllocatorFactoryTest {
    private BlockMetadataEvictorView mMetadataView;
  
    /** Rule to create a new temporary folder during each test. */
    @Rule
    public TemporaryFolder mTestFolder = new TemporaryFolder();
  
    /**
     * Sets up all dependencies before a test runs.
     */
    @Before
    public void before() throws Exception {
      String baseDir = mTestFolder.newFolder().getAbsolutePath();
      mMetadataView = TieredBlockStoreTestUtils.defaultMetadataManagerView(baseDir);
    }
  
    @After
    public void after() {
      Configuration.reloadProperties();
    }
  
    /**
     * Tests the creation of the {@link GreedyAllocator} via the
     * {@link Allocator.Factory#create(BlockMetadataView)} method.
     */
    @Test
    public void createGreedyAllocator() {
      Configuration.set(PropertyKey.WORKER_ALLOCATOR_CLASS, GreedyAllocator.class.getName());
      Allocator allocator = Allocator.Factory.create(mMetadataView);
      assertTrue(allocator instanceof GreedyAllocator);
    }
  
    /**
     * Tests the creation of the {@link MaxFreeAllocator} via the
     * {@link Allocator.Factory#create(BlockMetadataView)} method.
     */
    @Test
    public void createMaxFreeAllocator() {
      Configuration.set(PropertyKey.WORKER_ALLOCATOR_CLASS, MaxFreeAllocator.class.getName());
      Allocator allocator = Allocator.Factory.create(mMetadataView);
      assertTrue(allocator instanceof MaxFreeAllocator);
    }
  
    /**
     * Tests the creation of the {@link RoundRobinAllocator} via the
     * {@link Allocator.Factory#create(BlockMetadataView)} method.
     */
    @Test
    public void createRoundRobinAllocator() {
      Configuration.set(PropertyKey.WORKER_ALLOCATOR_CLASS,
          RoundRobinAllocator.class.getName());
      Allocator allocator = Allocator.Factory.create(mMetadataView);
      assertTrue(allocator instanceof RoundRobinAllocator);
    }
  
    /**
     * Tests the creation of the default allocator via the
     * {@link Allocator.Factory#create(BlockMetadataView)} method.
     */
    @Test
    public void createDefaultAllocator() {
      // Create a new instance of Alluxio configuration with original properties to test the default
      // behavior of create.
      Allocator allocator = Allocator.Factory.create(mMetadataView);
      assertTrue(allocator instanceof MaxFreeAllocator);
    }
  }
  