[rabbitmq-discuss] A new exchange type

Alister Morton Alister.Morton at tradition.com
Wed Jan 28 14:51:29 GMT 2009

> *queues* rather than the exchanges. Your observation that
> it's best placed in the *exchange* is, I think, critical. Great stuff!
To me that seems a logical place.

> So given a stateful (!) exchange of the kind you describe,
> what could some of the parameters be for its behaviour?

I'd say that at its simplest level you'd want to control whether the history persists a reboot or not (which could be separate from whether the exchange definition persists), the history depth (whether you only keep the most recent message, or whether messages ripple to a configurable depth. This could consume large resources, though) and how long the messages persist. For example, you /might/ want to always keep the most recent message, but lose the previous four messages (say) after they are over a certain age, or you might want messages to "drop off" after they exceed a certain age, so that eventually there was no history, or you might want to always keep the last five (say) messages regardless of how old they were.


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