esper and update listener concurrency

Question

I'm new to Esper and I was wondering if the update method of an UpdateListener is executed concurrently by multiple threads. If that's the case I conclude that write on an HashMap inside this method is not safe. Is it correct, or am I missing something?

Thanks in Advance

are you sure they execute cuncurnetly??? – saman Mar 03 '12 at 10:37 — saman, Mar 03 '12 at 10:37

score 2 · Accepted Answer · answered Mar 26 '12 at 19:36

2

I'm reading the documentation currently and it's definitely a good question to ask, since it's not necessarily a yes or no answer but seems like it depends on both configuration and your implementation.

Check out Chapter 3: Processing Model, Section 13.6: Engine Threading and Concurrency, and Section 14.4.9. Engine Settings related to Concurrency and Threading.

I would also love to hear of the design choices you made and why.

answered Mar 26 '12 at 19:36

Spencer Kormos

8,381
3
28
45

Unfortunately I didn't have time for further investigating how Esper handles concurrency and didn't tune its configuration, so I opted for the safe solution, I used a ConcurrentHashMap instead of an HashMap. – rlar Mar 27 '12 at 07:34

esper and update listener concurrency

1 Answers1