Difference between HornetQ Persistance and Durable Subscription (in case of Topic)

[ajinkya.bambal]

I am using topic to store messages.

In Case of Durable subscribers if subscriber is down then the JMS server will still collect messages on behalf of the subscriber. When the subscriber re-connects to the JMS server, it will receive all messages sent to the topic since last time it was.

In case of HornetQ Persistence , if consumer is not available then message is been stored in HornetQ's journoul & when consumer is up then message gets delivered to  consumer .

So my question is,

If I want Subscriber or Consumer should definitely consume messages then do I need to create subscriber as durable or HornetQ Persistance property is sufficient enough ?(Please Corect me if am wrong)

[ataylor]

hornetq persistance = messages are persisted = messages survive server crash

durable subscription = subscription survives consumer not being connected = it will receive all messages delivered to a topic.

[ajinkya.bambal]

In case of Queue , is durable subscription possible?.......

[ataylor]

In case of Queue , is durable subscription possible?.......

Im not really sure what you actually mean by that, durable subs are for topics, queues hold all messages anyway.

[clebert.suconic]

The only case where a JMS queue is not durable is when you have a temporary queue.

[ajinkya.bambal]

that means if a consumer is listening a perticular queue and if for some reason consumer is down , when it is up, again consumer will definitely receive the message  ...(probably due to persistance)...

every time  I got confuse between topic & queue  could u elaborate plz.......(waht exactly subscription to the topic means?)

Actually for my application I need both topic & queue for different purposes...but in both the cases I need to anyhow receive the message from hornetQ server ....

So in case of topic, DurableSubscriber is good option ,due to which i will definitely receive message at consumer end (even if consume/subscriber fails & later restarts)

but how can i sachieve same thing in case of queue? (vry sry if im asking silly doubts...)

[ataylor]

that means if a consumer is listening a perticular queue and if for some reason consumer is down , when it is up, again consumer will definitely receive the message  ...(probably due to persistance)...

Yes but not because pf persistance, as i said earlier persistant messages mean they survive server failure.

every time  I got confuse between topic & queue  could u elaborate plz.......(waht exactly subscription to the topic means?)

I would suggest reading a good JMS tutorial, the Sun one is pretty good.