lovelle commented on a change in pull request #4062: Delayed message delivery
implementation
URL: https://github.com/apache/pulsar/pull/4062#discussion_r276704232
##########
File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentDispatcherMultipleConsumers.java
##########
@@ -643,6 +654,59 @@ public void
initializeDispatchRateLimiterIfNeeded(Optional<Policies> policies) {
this.dispatchRateLimiter = Optional.of(new
DispatchRateLimiter(topic, name));
}
}
-
+
+ @Override
+ public synchronized boolean trackDelayedDelivery(long ledgerId, long
entryId, MessageMetadata msgMetadata) {
+ if (!isDelayedDeliveryEnabled) {
+ // If broker has the feature disabled, always deliver messages
immediately
+ return false;
+ }
+
+ if (!delayedDeliveryTracker.isPresent()) {
+ // Initialize the tracker the first time we need to use it
+ delayedDeliveryTracker = Optional.of(new
DelayedDeliveryTracker(this));
+ }
+
+ return delayedDeliveryTracker.get().addMessage(ledgerId, entryId,
msgMetadata.getDeliverAtTime());
+ }
+
+ /**
+ * Returns whether we have any message that could be immediately replayed.
+ * This could be a message that was requested to be re-delivered or a
delayed
+ * delivery.
+ */
+ private boolean hasMessagesToReplay() {
+ if (!messagesToRedeliver.isEmpty()) {
+ return true;
+ }
+
+ if (delayedDeliveryTracker.isPresent() &&
delayedDeliveryTracker.get().hasMessageAvailable()) {
+ return true;
+ }
+
+ return false;
+ }
+
+ private Set<PositionImpl> getMessagesToReplayNow(int maxMessagesToRead) {
+ if (!messagesToRedeliver.isEmpty()) {
+ return messagesToRedeliver.items(maxMessagesToRead,
Review comment:
I think we should protect this too, here we have a check-then-act race
condition.
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