content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.druid.benckmark.proxy;
  
  import junit.framework.TestCase;
  
  import java.util.concurrent.atomic.AtomicInteger;
  
  public class TestAtomicPerformance extends TestCase {
      public void test_0() throws Exception {
          AtomicInteger count = new AtomicInteger();
          for (int i = 0; i < 5; ++i) {
              perf(count);
          }
          System.out.println();
          for (int i = 0; i < 5; ++i) {
              perf2(count);
          }
      }
  
      private void perf(AtomicInteger count) {
          long startMillis = System.currentTimeMillis();
  
          count.set(0);
          for (int i = 0; i < 1000 * 1000 * 100; ++i) {
              int value = count.get();
              count.compareAndSet(value, value + 1);
          }
  
          long millis = System.currentTimeMillis() - startMillis;
          System.out.println("millis " + millis);
      }
  
      private void perf2(AtomicInteger count) {
          long startMillis = System.currentTimeMillis();
  
          count.set(0);
          for (int i = 0; i < 1000 * 1000 * 100; ++i) {
              int value = count.get();
              count.weakCompareAndSet(value, value + 1);
          }
  
          long millis = System.currentTimeMillis() - startMillis;
          System.out.println("weak millis " + millis);
      }
  }
  