public void start() {
if (t.isAlive()) {
log.warn(t + " is already started...");
return;
}
t.start();
}
public void stop() {
CountDownLatch stopped = t.stopped;
t.done = true;
try {
stopped.await();
} catch (InterruptedException e) {
log.error("Problem waiting for CheckpointManager to stop", e);
t.interrupt();
}
}
