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;
  
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.verify;
  
  import alluxio.client.file.FileInStream;
  import alluxio.client.file.FileOutStream;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public final class StreamCacheTest {
    @Test
    public void operations() throws Exception {
      StreamCache streamCache = new StreamCache(Constants.HOUR_MS);
      FileInStream is = mock(FileInStream.class);
      FileOutStream os = mock(FileOutStream.class);
      Integer isId = streamCache.put(is);
      Integer osId = streamCache.put(os);
      Assert.assertSame(is, streamCache.getInStream(isId));
      Assert.assertNull(streamCache.getInStream(osId));
      Assert.assertNull(streamCache.getOutStream(isId));
      Assert.assertSame(os, streamCache.getOutStream(osId));
      Assert.assertSame(is, streamCache.invalidate(isId));
      Assert.assertSame(os, streamCache.invalidate(osId));
      Assert.assertNull(streamCache.invalidate(isId));
      Assert.assertNull(streamCache.invalidate(osId));
      Assert.assertNull(streamCache.getInStream(isId));
      Assert.assertNull(streamCache.getOutStream(osId));
      verify(is).close();
      verify(os).close();
    }
  
    @Test
    public void concurrentOperations() throws Exception {
      final StreamCache streamCache = new StreamCache(Constants.HOUR_MS);
  
      class CacheTest<T> implements Runnable {
        private T mStream;
  
        CacheTest(T stream) {
          mStream = stream;
        }
  
        @Override
        public void run() {
          int cacheID = 0;
          if (mStream instanceof FileInStream) {
            cacheID = streamCache.put((FileInStream) mStream);
            Assert.assertSame(mStream, streamCache.getInStream(cacheID));
          }
          if (mStream instanceof FileOutStream) {
            cacheID = streamCache.put((FileOutStream) mStream);
            Assert.assertSame(mStream, streamCache.getOutStream(cacheID));
          }
          Assert.assertSame(mStream, streamCache.invalidate(cacheID));
        }
      }
  
      final int numOps = 100;
      final List<Thread> threads = new ArrayList<>();
      for (int i = 0; i < numOps; i++) {
        threads.add(new Thread(new CacheTest<>(mock(FileInStream.class))));
        threads.add(new Thread(new CacheTest<>(mock(FileOutStream.class))));
      }
      for (Thread thread : threads) {
        thread.start();
      }
      for (Thread thread : threads) {
        thread.join();
      }
      Assert.assertEquals(0, streamCache.size());
    }
  
    @Test
    public void expiration() throws Exception {
      StreamCache streamCache = new StreamCache(0);
      FileInStream is = mock(FileInStream.class);
      FileOutStream os = mock(FileOutStream.class);
      streamCache.put(is);
      streamCache.put(os);
      verify(is).close();
      verify(os).close();
    }
  
    @Test
    public void size() throws Exception {
      StreamCache streamCache = new StreamCache(Constants.HOUR_MS);
      FileInStream is = mock(FileInStream.class);
      FileOutStream os = mock(FileOutStream.class);
      Assert.assertEquals(0, streamCache.size());
      int isId = streamCache.put(is);
      Assert.assertEquals(1, streamCache.size());
      int osId = streamCache.put(os);
      Assert.assertEquals(2, streamCache.size());
      streamCache.invalidate(isId);
      Assert.assertEquals(1, streamCache.size());
      streamCache.invalidate(osId);
      Assert.assertEquals(0, streamCache.size());
    }
  }
  