Github user bgutjahr commented on a diff in the pull request:
https://github.com/apache/activemq-artemis/pull/1144#discussion_r108594658
--- Diff:
artemis-commons/src/main/java/org/apache/activemq/artemis/utils/ActiveMQThreadPoolExecutor.java
---
@@ -46,32 +45,70 @@
private static class ThreadPoolQueue extends
LinkedBlockingQueue<Runnable> {
private ActiveMQThreadPoolExecutor executor = null;
+ private int idleThreads = 0;
public void setExecutor(ActiveMQThreadPoolExecutor executor) {
this.executor = executor;
}
@Override
- public boolean offer(Runnable runnable) {
+ public synchronized boolean offer(Runnable runnable) {
--- End diff --
the synchronized is necessary to make sure the idleThreads doesn't change,
which is done it the related synchronized blocks in poll and take. I also
needed to make sure that no 2 offers occur in parallel. Otherwise, each offer
could see one remaining idle thread and queue it's task. But only 1 task has to
be be queued, for the other task a new thread has to be created. I might be
able to reduce the synchronization time, but I can't avoid it. I don't think
that the additional synchronization will be recognizable compared to the
runtime of the tasks to be executed. The underlying LinkedBlockingQueue also
uses a ReentrantLock (which I could't access). So I'm not sure if trying to
optimize on that level will be recognizable and would be worth the effort.
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