content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * Licensed 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 com.alibaba.cobar.util;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.concurrent.locks.ReentrantLock;
  
  /**
   * @author xianmao.hexm 2011-4-20 下午05:35:10
   */
  public class LockPerfMain {
  
      public void tReentrantLock() {
          System.currentTimeMillis();
          ReentrantLock lock = new ReentrantLock();
  
          long t1 = System.currentTimeMillis();
          for (int i = 0; i < 10000000; i++) {
              if (lock.tryLock())
                  try {
                      // ...
                  } finally {
                      lock.unlock();
                  }
          }
          long t2 = System.currentTimeMillis();
  
          System.out.println("take time:" + (t2 - t1) + " ms.");
      }
  
      public void tAtomicBoolean() {
          System.currentTimeMillis();
          AtomicBoolean atomic = new AtomicBoolean();
  
          long t1 = System.currentTimeMillis();
          for (int i = 0; i < 10000000; i++) {
              if (atomic.compareAndSet(false, true)) {
                  try {
                      // ...
                  } finally {
                      atomic.set(false);
                  }
              }
          }
          long t2 = System.currentTimeMillis();
  
          System.out.println("take time:" + (t2 - t1) + " ms.");
      }
  
  }
  