public synchronized void registerTracker(final ManagementChannelShutdownHandle tracker) {
if (!shutdown) {
trackers.add(tracker);
} else {
tracker.shutdown();
}
}
public synchronized void prepareShutdown() {
shutdown = true;
final List<ManagementChannelShutdownHandle> trackers = new ArrayList<>(this.trackers);
for (final ManagementChannelShutdownHandle tracker : trackers) {
tracker.shutdown();
}
}