Пример #1
0
    HeapUsageMonitor() {
      int c = 0;
      for (MemoryPoolMXBean m : ManagementFactory.getMemoryPoolMXBeans()) {
        if (m.getType() != MemoryType.HEAP) // only interested in HEAP
        continue;
        if (m.isCollectionUsageThresholdSupported() && m.isUsageThresholdSupported()) {
          // should be Old pool, get called when memory is critical
          _oldGenBean = m;
          _gc_callback = MEM_MAX;
          // Really idiotic API: no idea what the usageThreshold is, so I have
          // to guess. Start high, catch IAE & lower by 1/8th and try again.
          while (true) {
            try {
              m.setCollectionUsageThreshold(_gc_callback);
              break;
            } catch (IllegalArgumentException iae) {
              // Do NOT log this exception, it is expected and unavoidable and
              // entirely handled.

              _gc_callback -= (_gc_callback >> 3);
            }
          }
          NotificationEmitter emitter = (NotificationEmitter) _allMemBean;
          emitter.addNotificationListener(this, null, m);
          ++c;
        }
      }
      assert c == 1;
    }
Пример #2
0
  public static void main(String[] argv) throws Exception {
    memory = new ObjectName(MEMORY_MXBEAN_NAME);
    runtime = new ObjectName(RUNTIME_MXBEAN_NAME);
    thread = new ObjectName(THREAD_MXBEAN_NAME);
    os = new ObjectName(OPERATING_SYSTEM_MXBEAN_NAME);

    List<MemoryPoolMXBean> pools = getMemoryPoolMXBeans();
    for (MemoryPoolMXBean p : pools) {
      if (heapPool == null
          && p.getType() == MemoryType.HEAP
          && p.isUsageThresholdSupported()
          && p.isCollectionUsageThresholdSupported()) {
        heapPool = new ObjectName(MEMORY_POOL_MXBEAN_DOMAIN_TYPE + ",name=" + p.getName());
      }
      if (nonHeapPool == null
          && p.getType() == MemoryType.NON_HEAP
          && p.isUsageThresholdSupported()) {
        nonHeapPool = new ObjectName(MEMORY_POOL_MXBEAN_DOMAIN_TYPE + ",name=" + p.getName());
      }
    }

    // Check notification emitters
    MyListener listener = new MyListener();
    server.addNotificationListener(memory, listener, null, null);
    server.removeNotificationListener(memory, listener);

    checkEnum();
    checkList();
    checkMap();
    checkMemoryUsage();
    checkThreadInfo();

    checkOS();
    checkSunGC();

    System.out.println("Test passed.");
  }