On 02/05/2015 02:28 PM, Toralf Lund wrote:
On 02/02/15 16:21, Gordon Sim wrote:
The capacity controls the number of 'pre-fetched' messages, i.e.
messages sent by the broker (or peer) in anticipation of subsequent
fetch() calls.
When exactly are message pre-fetched?
When the capacity of the receiver is set to a non-zero value, that
number of credits are issued to the broker. Its then at the brokers
discretion when they send messages to use up the credit (or indeed
whether they have any messages to send). The broker cannot send more
than the number of credits allocated though. (If the queue has
sufficient messages, the broker will usually immediately send the full
number of messages).
When a message is returned to the application, the library can issue one
more credit - i.e. it slides the prefetch window forward - however it
doesn't necessarily send this immediately to the broker, there is often
some level of batching and it only sends it if its sending something
anyway or if it has some level of outstanding credit.
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