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.client.file.cache;
  
  import alluxio.client.file.cache.evictor.CacheEvictorOptions;
  import alluxio.client.file.cache.evictor.LRUCacheEvictor;
  
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * Tests for the {@link LRUCacheEvictor} class.
   */
  public final class LRUCacheEvictorTest {
    private LRUCacheEvictor mEvictor;
    private final PageId mFirst = new PageId("1L", 2L);
    private final PageId mSecond = new PageId("3L", 4L);
    private final PageId mThird = new PageId("5L", 6L);
  
    /**
     * Sets up the instances.
     */
    @Before
    public void before() {
      mEvictor = new LRUCacheEvictor(new CacheEvictorOptions());
    }
  
    @Test
    public void evictGetOrder() {
      mEvictor.updateOnGet(mFirst);
      mEvictor.updateOnGet(mSecond);
      Assert.assertEquals(mFirst, mEvictor.evict());
      mEvictor.updateOnDelete(mFirst);
      Assert.assertEquals(mSecond, mEvictor.evict());
    }
  
    @Test
    public void evictUpdatedGetOrder() {
      mEvictor.updateOnGet(mFirst);
      mEvictor.updateOnGet(mSecond);
      mEvictor.updateOnGet(mThird);
      mEvictor.updateOnGet(mFirst);
      Assert.assertEquals(mSecond, mEvictor.evict());
      mEvictor.updateOnDelete(mSecond);
      Assert.assertEquals(mThird, mEvictor.evict());
      mEvictor.updateOnDelete(mThird);
      Assert.assertEquals(mFirst, mEvictor.evict());
    }
  
    @Test
    public void evictPutOrder() {
      mEvictor.updateOnPut(mFirst);
      mEvictor.updateOnPut(mSecond);
      Assert.assertEquals(mFirst, mEvictor.evict());
      mEvictor.updateOnDelete(mFirst);
      Assert.assertEquals(mSecond, mEvictor.evict());
    }
  
    @Test
    public void evictUpdatedPutOrder() {
      mEvictor.updateOnPut(mFirst);
      mEvictor.updateOnPut(mSecond);
      mEvictor.updateOnPut(mThird);
      mEvictor.updateOnPut(mFirst);
      Assert.assertEquals(mSecond, mEvictor.evict());
      mEvictor.updateOnDelete(mSecond);
      Assert.assertEquals(mThird, mEvictor.evict());
      mEvictor.updateOnDelete(mThird);
      Assert.assertEquals(mFirst, mEvictor.evict());
    }
  
    @Test
    public void evictAfterDelete() {
      mEvictor.updateOnPut(mFirst);
      mEvictor.updateOnPut(mSecond);
      mEvictor.updateOnPut(mThird);
      mEvictor.updateOnDelete(mSecond);
      Assert.assertEquals(mFirst, mEvictor.evict());
      mEvictor.updateOnDelete(mFirst);
      Assert.assertEquals(mThird, mEvictor.evict());
    }
  
    @Test
    public void evictEmpty() {
      Assert.assertNull(mEvictor.evict());
    }
  
    @Test
    public void evictAllGone() {
      mEvictor.updateOnPut(mFirst);
      mEvictor.updateOnPut(mSecond);
      mEvictor.updateOnPut(mThird);
      mEvictor.updateOnDelete(mFirst);
      mEvictor.updateOnDelete(mSecond);
      mEvictor.updateOnDelete(mThird);
      Assert.assertNull(mEvictor.evict());
    }
  }
  