[esb-issues] [JBoss JIRA] Assigned: (JBESB-467) Reducing registry lookup overhead

[Mark Little (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBESB-467?page=all ]

Mark Little reassigned JBESB-467:
---------------------------------

    Assignee: Mark Little

> Reducing registry lookup overhead
> ---------------------------------
>
>                 Key: JBESB-467
>                 URL: http://jira.jboss.com/jira/browse/JBESB-467
>             Project: JBoss ESB
>          Issue Type: Task
>      Security Level: Public(Everyone can see) 
>          Components: Registry and Repository, Rosetta
>    Affects Versions: 4.0
>            Reporter: Mark Little
>         Assigned To: Mark Little
>            Priority: Optional
>             Fix For: 5.0
>
>
> From our previous discussion on reducing registry lookup overhead (currently lookup per message send):
> There are a number of solutions to this and we should try to support them all eventually:
> (i) EPR lifetime: service deployers can register a lifetime associated with the EPR in the registry and when something reads the EPR it also receives information on how long the EPR will remain valid for. After that time elapses, clients must go back to the registry to get a new copy.
> (ii) building on (i), EPRs can be marked as persistent - they never change so one lookup will always be enough.
> (iii) interactions with services are scoped by sessions and the EPR is assumed to remain valid for the duration of the session. The service can be marked as useable within such a session.
> (iv) EPRs are looked up once per client lifecycle and only rebound if the service fails. If you recall from the original ESB architecture document, service migration is something that is on the roadmap (5.0) and if a service moves it can leave a forwarding address (EPR) and the architecture allows messages to be redirected and eventually short-cut, i.e., the client EPR is updated with the new EPR transparently as a result of receiving a response from a different endpoint.
> (iii) and (iv) are really for the 5.0 architecture. However, it should be possible to add something along (i) and (ii) for 4.0. What do you think?

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