mattrpav commented on code in PR #1329:
URL: https://github.com/apache/activemq/pull/1329#discussion_r1878876829
##########
activemq-broker/src/main/java/org/apache/activemq/broker/region/DestinationStatistics.java:
##########
@@ -76,6 +87,17 @@ public DestinationStatistics() {
networkEnqueues = new CountStatisticImpl("networkEnqueues", "The
number of messages that have been sent to the destination via network
connection");
networkDequeues = new CountStatisticImpl("networkDequeues", "The
number of messages that have been acknowledged from the destination via network
connection");
+ enqueuedMessageBrokerInTime = new
UnsampledStatisticImpl<>("enqueuedMessageBrokerInTime", "ms", "Broker in time
(ms) of last enqueued message to the destination", Long.valueOf(0l));
+ enqueuedMessageClientID = new
UnsampledStatisticImpl<>("enqueuedMessageClientID", "id", "ClientID of last
enqueued message to the destination", null);
+ enqueuedMessageID = new UnsampledStatisticImpl<>("enqueuedMessageID",
"id", "MessageID of last enqueued message to the destination", null);
+ enqueuedMessageTimestamp = new
UnsampledStatisticImpl<>("enqueuedMessageTimestamp", "ms", "Message timestamp
of last enqueued message to the destination", Long.valueOf(0l));
+
+ dequeuedMessageBrokerInTime = new
UnsampledStatisticImpl<>("dequeuedMessageBrokerInTime", "ms", "Broker in time
(ms) of last dequeued message to the destination", Long.valueOf(0l));
Review Comment:
I experimented with this. I ran into a condition where supporting dynamic
config update (good feature) would require a lock around all advanced network
and advanced message stats operations.
Possible paths to move forward:
Option 1: Do not optimize for memory, allocate all metrics at startup time
Option 2: Lazy init advanced stats fields. Support only allocating
statistics when moving from enabled = false to enabled = true. Moving from
enabled = true to enabled = false would leave metrics fields present (or
perhaps we could reset them)
Option 3: Add locking around all the advanced[Network|Message]Statistics
operations (bleh)
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