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   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * 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
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.ambari.server.logging;
  
  import static org.easymock.EasyMock.expect;
  
  import java.util.Collections;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.locks.ReentrantLock;
  import java.util.concurrent.locks.ReentrantReadWriteLock;
  
  import org.easymock.EasyMockSupport;
  import org.junit.Assert;
  import org.junit.Test;
  
  import com.google.common.base.Ticker;
  
  public class ProfiledReentrantReadWriteLockTest extends EasyMockSupport {
  
    private static final String LABEL = "label";
  
    @Test
    public void lockingReadLockOnlyLocksReadLock() {
      ReentrantReadWriteLock delegate = new ReentrantReadWriteLock();
      ProfiledReentrantReadWriteLock testSubject = new ProfiledReentrantReadWriteLock(delegate, Ticker.systemTicker(), LABEL);
  
      testSubject.readLock().lock();
  
      Assert.assertEquals(1, delegate.getReadHoldCount());
      Assert.assertEquals(0, delegate.getWriteHoldCount());
    }
  
    @Test
    public void lockingWriteLockOnlyLocksWriteLock() {
      ReentrantReadWriteLock delegate = new ReentrantReadWriteLock();
      ProfiledReentrantReadWriteLock testSubject = new ProfiledReentrantReadWriteLock(delegate, Ticker.systemTicker(), LABEL);
  
      testSubject.writeLock().lock();
  
      Assert.assertEquals(0, delegate.getReadHoldCount());
      Assert.assertEquals(1, delegate.getWriteHoldCount());
    }
  
    @Test
    public void timeWaitingForReadLockIsRecorded() {
      Ticker ticker = createMock(Ticker.class);
      ProfiledLock testSubject = new ProfiledReentrantReadWriteLock(new ReentrantReadWriteLock(), ticker, LABEL).readLock();
      timeWaitingForLockIsRecorded(testSubject, ticker);
    }
  
    @Test
    public void timeWaitingForWriteLockIsRecorded() {
      Ticker ticker = createMock(Ticker.class);
      ProfiledLock testSubject = new ProfiledReentrantReadWriteLock(new ReentrantReadWriteLock(), ticker, LABEL).writeLock();
      timeWaitingForLockIsRecorded(testSubject, ticker);
    }
  
    private void timeWaitingForLockIsRecorded(ProfiledLock testSubject, Ticker ticker) {
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(1L));
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(4L));
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(5L));
      replayAll();
  
      testSubject.lock();
  
      Assert.assertEquals(Collections.singletonMap(Thread.currentThread().getName(), 4L - 1L), testSubject.getTimeSpentWaitingForLock());
      verifyAll();
    }
  
    @Test
    public void timeReadLockSpentLockedIsRecorded() {
      Ticker ticker = createMock(Ticker.class);
      ProfiledLock testSubject = new ProfiledReentrantReadWriteLock(new ReentrantReadWriteLock(), ticker, LABEL).readLock();
      timeSpentLockedIsRecorded(ticker, testSubject);
    }
  
    @Test
    public void timeWriteLockSpentLockedIsRecorded() {
      Ticker ticker = createMock(Ticker.class);
      ProfiledLock testSubject = new ProfiledReentrantReadWriteLock(new ReentrantReadWriteLock(), ticker, LABEL).writeLock();
      timeSpentLockedIsRecorded(ticker, testSubject);
    }
  
    @Test
    public void timeLockSpentLockedIsRecorded() {
      Ticker ticker = createMock(Ticker.class);
      ProfiledLock testSubject = new ProfiledReentrantLock(new ReentrantLock(), ticker, LABEL);
      timeSpentLockedIsRecorded(ticker, testSubject);
    }
  
    private void timeSpentLockedIsRecorded(Ticker ticker, ProfiledLock testSubject) {
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(0L));
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(0L));
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(6L));
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(13L));
      replayAll();
  
      testSubject.lock();
      testSubject.unlock();
  
      Assert.assertEquals(Collections.singletonMap(Thread.currentThread().getName(), 13L - 6L), testSubject.getTimeSpentLocked());
      verifyAll();
    }
  
    @Test
    public void onlyOutermostLockUnlockIsProfiledForReadLock() {
      Ticker ticker = createMock(Ticker.class);
      ProfiledLock testSubject = new ProfiledReentrantReadWriteLock(new ReentrantReadWriteLock(), ticker, LABEL).readLock();
      onlyOutermostLockUnlockIsProfiled(testSubject, ticker);
    }
  
    @Test
    public void onlyOutermostLockUnlockIsProfiledForWriteLock() {
      Ticker ticker = createMock(Ticker.class);
      ProfiledLock testSubject = new ProfiledReentrantReadWriteLock(new ReentrantReadWriteLock(), ticker, LABEL).readLock();
      onlyOutermostLockUnlockIsProfiled(testSubject, ticker);
    }
  
    @Test
    public void onlyOutermostLockUnlockIsProfiled() {
      Ticker ticker = createMock(Ticker.class);
      ProfiledLock testSubject = new ProfiledReentrantLock(new ReentrantLock(), ticker, LABEL);
      onlyOutermostLockUnlockIsProfiled(testSubject, ticker);
    }
  
    private void onlyOutermostLockUnlockIsProfiled(ProfiledLock testSubject, Ticker ticker) {
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(0L));
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(0L));
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(5L));
      expect(ticker.read()).andReturn(TimeUnit.MILLISECONDS.toNanos(19L));
      replayAll();
  
      testSubject.lock();
      testSubject.lock();
      testSubject.unlock();
      testSubject.unlock();
  
      Assert.assertEquals(Collections.singletonMap(Thread.currentThread().getName(), 19L - 5L), testSubject.getTimeSpentLocked());
      Assert.assertEquals(Collections.singletonMap(Thread.currentThread().getName(), 1), testSubject.getLockCount());
      verifyAll();
    }
  
  }
  