[jboss-dev-forums] [Design of JBoss ESB] - Re: Design of a Content Based Routing Service

[ddunkin]

Upgrading to JBossRules 3 will mean rewriting the DSL, which is fine. I haven't looked at how it's done in the new version, but it was dead simple to write a DSL for Drools. What do you mean by "plain java implementation?"

Do you want to support a single language for rule matching (e.g. XPath) or leave it open-ended/extensible? I think that will help define whether or not to support Serializable. It would be cool to be able to specify a rule using EL on a POJO graph and XPath on an XML document. I guess it wouldn't really matter as long as the RHS of the rule fulfilled some contract like asserting a Destination to working memory.

For my needs, if no rule matches the message, the message router returns an error. I could envision others wanting a default route/destination. I'm not very familiar with the action chain, but could that just be another action for those that require that functionality? I.e. an action after the CBR action would check for a defined destination and set a default if none exists. I suppose that would only work if the CBR service returns an action name instead of forwarding the message.

I don't have an immediate need for sending one message to multiple destinations, but I will in the future. The only tricky part about that I can think of is with synchronous messages. If I send a message and am expecting a reply, who do I accept a reply from? My thought would be for synchronous messages to have one primary destination, from which the reply would come, and secondary destinations, which would be sent the message asynchronously. I haven't followed JBossESB that closely -- is there even the concept of synchronous and asynchronous messages?

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