public T receive() {
lock.lock();
try {
while (true) {
DelayedMessage message = queue.peek();
if (message == null && stopping) {
return null;
}
if (message == null) {
condition.await();
continue;
}
long now = timeProvider.getCurrentTime();
if (message.dispatchTime > now) {
condition.awaitUntil(new Date(message.dispatchTime));
} else {
queue.poll();
if (queue.isEmpty()) {
condition.signalAll();
}
return message.message;
}
}
} catch (InterruptedException e) {
throw UncheckedException.asUncheckedException(e);
} finally {
lock.unlock();
}
}
/** Dispatches the given message after the given delay. */
public void dispatchLater(T message, int delayValue, TimeUnit delayUnits) {
long dispatchTime = timeProvider.getCurrentTime() + delayUnits.toMillis(delayValue);
lock.lock();
try {
if (stopping) {
throw new IllegalStateException("This dispatch has been stopped.");
}
queue.add(new DelayedMessage(dispatchTime, message));
condition.signalAll();
} finally {
lock.unlock();
}
}
ModuleResolutionCacheEntry(ModuleRevisionId revisionId, TimeProvider timeProvider) {
this.encodedRevisionId = revisionId == null ? null : revisionId.encodeToString();
this.createTimestamp = timeProvider.getCurrentTime();
}