private ListenableFuture<Duration> announce() {
final ListenableFuture<Duration> future =
announcementClient.announce(ImmutableSet.copyOf(announcements.values()));
Futures.addCallback(
future,
new FutureCallback<Duration>() {
@Override
public void onSuccess(Duration duration) {
errorBackOff.success();
// wait 80% of the suggested delay
duration = new Duration(duration.toMillis() * 0.8, MILLISECONDS);
scheduleNextAnnouncement(duration);
}
@Override
public void onFailure(Throwable t) {
Duration duration = errorBackOff.failed(t);
scheduleNextAnnouncement(duration);
}
},
executor);
return future;
}
@PreDestroy
public void destroy() {
executor.shutdownNow();
try {
executor.awaitTermination(30, TimeUnit.SECONDS);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
// unannounce
try {
getFutureResult(announcementClient.unannounce(), DiscoveryException.class);
} catch (DiscoveryException e) {
if (e.getCause() instanceof ConnectException) {
log.error(
"Cannot connect to discovery server for unannounce: %s", e.getCause().getMessage());
} else {
log.error(e);
}
}
}
