Message Ordering

[nath]

hi friends,

I am new to jms.I have a problem.

I have multiple sender programs which sends messages to a Queue concurrently and have a single receiver program which receives messages from the queue. Sender1 sends 10 messages sender2 sends 10 messages etc. When I receive the messages from the Queue,message sent by different senders get mixed, like message1 of first sender then message 1 of second sender then message 2 of first sender etc.Is there any way to get all the message send by a single sender in a single session arrives in the Queue in a group?

hoping for help,

nath.

[robisz]

Hi!

I guess it's not possible.
You can try to add a sender id to your messages and your
receiver can sort out them by the id... but it's not exactly what you want.

I recommend you use different queues for senders and your
receiver can listen all of them.

robisz

[nath]

Robisz, thanks for your inputs. Shall I use a transacted session to solve the problem? Will JMS ensures that a messages sent from a transacted session to a Queue will always arrive in the Queue in a group

[schrouf]

Transacted sessions will ensure that all or none (in case of failure) of your messages will be stored in the queue, but this does NOT mean, that there is a logical grouping between these messages which can be used for group based message processing on the client side !

Read the JMS specification. You should not make any assumtions on message delivery order, as this would prohibit MDB scalebility ! Each message is treated as a independant logical unit of work.