content: /*
  
   * Copyright (C) 2016 The Android Open Source Project
   *
   * 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.
   */
  
  import java.lang.reflect.Method;
  import java.util.Map;
  
  public class Main implements Runnable {
      static final int numberOfThreads = 4;
      static final int totalOperations = 1000;
      static Method enableAllocTrackingMethod;
      static Object holder;
      static volatile boolean trackingThreadDone = false;
      int threadIndex;
  
      Main(int index) {
          threadIndex = index;
      }
  
      public static void main(String[] args) throws Exception {
        Class klass = Class.forName("org.apache.harmony.dalvik.ddmc.DdmVmInternal");
        if (klass == null) {
            throw new AssertionError("Couldn't find DdmVmInternal class");
        }
        enableAllocTrackingMethod = klass.getDeclaredMethod("enableRecentAllocations",
                Boolean.TYPE);
        if (enableAllocTrackingMethod == null) {
            throw new AssertionError("Couldn't find enableRecentAllocations method");
        }
  
        final Thread[] threads = new Thread[numberOfThreads];
        for (int t = 0; t < threads.length; t++) {
            threads[t] = new Thread(new Main(t));
            threads[t].start();
        }
        for (Thread t : threads) {
            t.join();
        }
        System.out.println("Finishing");
      }
  
      public void run() {
          if (threadIndex == 0) {
              for (int i = 0; i < totalOperations; ++i) {
                  try {
                      enableAllocTrackingMethod.invoke(null, true);
                      holder = new Object();
                      enableAllocTrackingMethod.invoke(null, false);
                  } catch (Exception e) {
                      System.out.println(e);
                      return;
                  }
              }
              trackingThreadDone = true;
          } else {
              while (!trackingThreadDone) {
                  holder = new Object();
              }
          }
      }
  }
  