PerformanceWatcher.java 文件源码

private void watchCodeCache(final MemoryPoolMXBean bean) {
  final long threshold = bean.getUsage().getMax() - 5 * 1024 * 1024;
  if (!bean.isUsageThresholdSupported() || threshold <= 0) return;

  bean.setUsageThreshold(threshold);
  final NotificationEmitter emitter = (NotificationEmitter)ManagementFactory.getMemoryMXBean();
  emitter.addNotificationListener(new NotificationListener() {
    @Override
    public void handleNotification(Notification n, Object hb) {
      if (bean.getUsage().getUsed() > threshold) {
        LOG.info("Code Cache is almost full");
        dumpThreads("codeCacheFull", true);
        try {
          emitter.removeNotificationListener(this);
        }
        catch (ListenerNotFoundException e) {
          LOG.error(e);
        }
      }
    }
  }, null, null);
}