[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - JBM 2.0 Strict ordering via ordering groups

[ataylor]

Firstly add a groupid and group sequence to message reference, this will be set on send similar to how scheduled delivery time is set. (theres a todo in ServerSessionImpl::send to do with duplicate code which i'll fix whilst I'm doing this)

Create a new interface and impl for controlling the delivery of grouped messages, we'll call this GroupedMessageHandler. This will maintain what messages are in transit for each group, it wll have a method canDeliver(MessageReference ref) that will return true if the message can be delivered, i.e., the consumer has acked the last reference sent and the group seq if this reference is the next in sequence. The deliver method of QueueImpl will use the GroupMessageHandler to decide if what messages can be delivered to the consumer and also notify it of each acknowledgment.

I don't think it makes sense for a queue to handle messages that are both grouped and non grouped so a flag can be added to specify tjhat a queue is handling grouped messages only. If a queue is 'enableGroupOrdering' the it should ignore any messages routed that don't have the groupid and seq set and also disallow message scheduling.

When creating a core producer it should be possible to set its groupid to an arbitrary string and allow it to set the sequence automatically or let the user set it via the message itself. 

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