[rabbitmq-discuss] Schedule Messages

[David Wragg]

Matthias Radestock <matthias at rabbitmq.com> writes:
> Another solution, which you can implement right now, is to get the
> publishers to stick an expiry header into the message and to publish
> the message to a dedicated delay queue. A helper app consumes messages
> from that queue one at a time and checks the expiry. If the expiry is
> in the past it re-publishes the message to the appropriate exchange
> for routing. Otherwise it waits until the deadline.

This (any many other) AMQP intermiediaries would be assisted by:

- A way to consume messages without receiving the message content, just
  the properties and headers.

- A way to republish consumed messages without having to re-send the
  message content to the server.

An with these features, implementing a general and efficient message
scheduler based on timer wheels would be fairly simple.

David

-- 
David Wragg
Staff Engineer, RabbitMQ
SpringSource, a division of VMware