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.util.IdentityHashMap;
  import dalvik.system.VMRuntime;
  
  public class Main {
    public static void main(String[] args) {
      System.loadLibrary(args[0]);
      int initialSize = monitorListSize();
      IdentityHashMap<Object, Integer> all = new IdentityHashMap();
      for (int i = 0; i < 5000; ++i) {
        Object obj = new Object();
        synchronized(obj) {
          // Should force inflation.
          all.put(obj, obj.hashCode());
        }
      }
      // Since monitor deflation is delayed significantly, we believe that even with an intervening
      // GC, monitors should remain inflated.  We allow some slop for unrelated concurrent runtime
      // actions.
      int inflatedSize = monitorListSize();
      if (inflatedSize >= initialSize + 4000) {
          System.out.println("Monitor list grew by at least 4000 monitors");
      } else {
          System.out.println("Monitor list did not grow as expected");
      }
      // Encourage monitor deflation.
      // trim() (Heap::Trim()) deflates only in JANK_IMPERCEPTIBLE state.
      // Some of this mirrors code in ActivityThread.java.
      final int DALVIK_PROCESS_STATE_JANK_PERCEPTIBLE = 0;
      final int DALVIK_PROCESS_STATE_JANK_IMPERCEPTIBLE = 1;
      VMRuntime.getRuntime().updateProcessState(DALVIK_PROCESS_STATE_JANK_IMPERCEPTIBLE);
      System.gc();
      System.runFinalization();
      trim();
      VMRuntime.getRuntime().updateProcessState(DALVIK_PROCESS_STATE_JANK_PERCEPTIBLE);
      int finalSize = monitorListSize();
      if (finalSize > initialSize + 1000) {
          System.out.println("Monitor list failed to shrink properly");
      } else {
          System.out.println("Monitor list shrank correctly");
      }
      int j = 0;
      for (Object obj: all.keySet()) {
        ++j;
        if (obj.hashCode() != all.get(obj)) {
          throw new AssertionError("Failed hashcode test!");
        }
      }
      System.out.println("Finished first check");
      for (Object obj: all.keySet()) {
        ++j;
        synchronized(obj) {
          if (obj.hashCode() != all.get(obj)) {
            throw new AssertionError("Failed hashcode test!");
          }
        }
      }
      System.out.println("Finished second check");
      System.out.println("Total checks: " + j);
    }
  
    private static native void trim();
  
    private static native int monitorListSize();
  }
  