Hi,

It's very likely that I don't really understand the concept of
exchange. So please bear with me. Say I bind the queue with routing
key "WashingtonPost" to the topic exchange "politics" using pattern
"africa.egypt.#". Now if we get rid of the concept of exchange.
Wouldn't this be equivalent to binding the "WashingtonPost" to the
pattern "politics.africa.egypt.#"?

What am I missing that makes the exchange paradigm so necessary in AMQP?

Thanks,
Max.

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  • Ciprian Dorin Craciun at Feb 12, 2011 at 6:14 pm

    On Sat, Feb 12, 2011 at 04:45, Max Bridgewater wrote:
    Hi,

    It's very likely that I don't really understand the concept of
    exchange. So please bear with me. Say I bind the queue with routing
    key "WashingtonPost" to the topic exchange "politics" using pattern
    "africa.egypt.#". Now if we get rid of the concept of exchange.
    Wouldn't this be equivalent to binding the "WashingtonPost" to the
    pattern "politics.africa.egypt.#"?

    What am I missing that makes the exchange paradigm so necessary in AMQP?

    Thanks,
    Max.

    Although I can't provide a direct answer to your question, I would
    say that at least from a security point of view, exchanges are very
    useful as they allow me to explicitly allow / disallow which users can
    either post or consume messages. (It is impossible to use ACL's on
    routing keys.)

    For example if I would to replace D-Bus with AMQP, only anyone
    could subscribe to the "os.control" exchange (both the control daemon
    but also interested users / applications), but only an OS operator
    could publish messages to that particular exchange to for example
    reboot the OS.

    Further more, exchanges determine how routing is done -- some
    based on the routing key, others based on headers -- and in recent
    versions of RabbitMQ (2.2.0?) you can bind exchanges to exchanges,
    thus offering you a poor-man AND / OR operators.

    I hope others could provide you with a better / more to the point answer.

    Ciprian.

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