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.master.file.meta;
  
  import static org.junit.Assert.assertFalse;
  
  import alluxio.concurrent.LockMode;
  import alluxio.master.file.contexts.CreateFileContext;
  import alluxio.resource.LockResource;
  import alluxio.util.CommonUtils;
  
  import org.junit.Test;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  
  /**
   * Unit tests for {@link InodeLockManager}.
   */
  public class InodeLockManagerTest {
    @Test(timeout = 10000)
    public void lockInode() throws Exception {
      inodeLockTest(LockMode.WRITE, LockMode.READ, true);
      inodeLockTest(LockMode.READ, LockMode.WRITE, true);
      inodeLockTest(LockMode.WRITE, LockMode.WRITE, true);
      inodeLockTest(LockMode.READ, LockMode.READ, false);
    }
  
    @Test(timeout = 10000)
    public void lockEdge() throws Exception {
      edgeLockTest(LockMode.WRITE, LockMode.READ, true);
      edgeLockTest(LockMode.READ, LockMode.WRITE, true);
      edgeLockTest(LockMode.WRITE, LockMode.WRITE, true);
      edgeLockTest(LockMode.READ, LockMode.READ, false);
    }
  
    private void inodeLockTest(LockMode take, LockMode tryToTake, boolean expectBlocking)
        throws Exception {
      InodeLockManager lockManager = new InodeLockManager();
      AtomicBoolean threadFinished = new AtomicBoolean(false);
      MutableInodeFile inode = MutableInodeFile.create(0, 0, "name", 0, CreateFileContext.defaults());
      LockResource lock = lockManager.lockInode(inode, take, false);
      Thread t = new Thread(() -> {
        // Copy the inode to make sure we aren't comparing inodes by reference.
        MutableInodeFile inodeCopy =
            MutableInodeFile.fromJournalEntry(inode.toJournalEntry().getInodeFile());
        try (LockResource lr = lockManager.lockInode(inodeCopy, tryToTake, false)) {
          threadFinished.set(true);
        }
      });
      t.start();
      if (expectBlocking) {
        CommonUtils.sleepMs(20);
        assertFalse(threadFinished.get());
        lock.close();
      }
      CommonUtils.waitFor("lock to be acquired by the second thread", threadFinished::get);
    }
  
    private void edgeLockTest(LockMode take, LockMode tryToTake, boolean expectBlocking)
        throws Exception {
      InodeLockManager lockManager = new InodeLockManager();
      AtomicBoolean threadFinished = new AtomicBoolean(false);
      LockResource lock = lockManager.lockEdge(new Edge(10, "name"), take, false);
      Thread t = new Thread(() -> {
        // Use a new Edge each time to make sure we aren't comparing edges by reference.
        try (LockResource lr = lockManager.lockEdge(new Edge(10, "name"), tryToTake, false)) {
          threadFinished.set(true);
        }
      });
      t.start();
      if (expectBlocking) {
        CommonUtils.sleepMs(20);
        assertFalse(threadFinished.get());
        lock.close();
      }
      CommonUtils.waitFor("lock to be acquired by the second thread", () -> threadFinished.get());
    }
  }
  