RetainedHeapLimiter.java 文件源码

void install() {
  Preconditions.checkState(!installed, "RetainedHeapLimiter installed twice");
  installed = true;
  List<GarbageCollectorMXBean> gcbeans = ManagementFactory.getGarbageCollectorMXBeans();
  boolean foundTenured = false;
  // Examine all collectors and register for notifications from those which collect the tenured
  // space. Normally there is one such collector.
  for (GarbageCollectorMXBean gcbean : gcbeans) {
    boolean collectsTenured = false;
    for (String name : gcbean.getMemoryPoolNames()) {
      collectsTenured |= isTenuredSpace(name);
    }
    if (collectsTenured) {
      foundTenured = true;
      NotificationEmitter emitter = (NotificationEmitter) gcbean;
      emitter.addNotificationListener(this, null, null);
    }
  }
  if (!foundTenured) {
    throw new IllegalStateException(
        "Can't find tenured space; update this class for a new collector");
  }
}