On 02/12/16 20:14, James Franco wrote:
I am trying to understand what happens when we send a message to a queue
with a little more perspective.
Supose I have an exchange called *my-ex *that has a queue called *my_q*
and this queue is bound to the exchange with the binding key *my_bid*.
Now when I send a message to the queue directrly like this
./spout my_q/someSubject This is a bind test
The message is received when I do this
./drain my_q
Now I have two questions regarding this:
1- since the address being used is my_q and there is no exchange mentioned
(or the exchnage is blank) in the address does the broker first check the
default exchange and then look consecutively into other exchanges until it
finds the specified queue ?
No. The client will send the message to the default exchange with a
routing key of 'my_q'. If a queue named 'my_q' exists, the default
exchange is guaranteed to have a binding with key 'my_q' for the my_q queue.
2-From my understanding so far is that when a message is sent to an
exchange instead of a queue then depending on the type of exchange the
message is routed to a specific queue based on the routing id and binding
id of the queue , however if the message is sent to the a queue directly
(instead of an exchnage name) then routing id and binding id do not matter
and the message will be delivered to the queue. Is my understanding correct
?
At the protocol level, messages are *always* sent to an exchange. The
qpid messaging API presents a higher level abstraction where you just
send to or receive from an address. If the address is a queue, and if
you are using AMQP 0-10 (rather than 1.0), this will cause the client to
send to the default exchange (which is really just a hack to allow you
to emulate sending to a queue which that protocol version did not support).
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