When a subscription is created, message credits should only be set if the
session is active.
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Key: QPID-2559
URL: https://issues.apache.org/jira/browse/QPID-2559
Project: Qpid
Issue Type: Bug
Components: C++ Client
Affects Versions: 0.6
Reporter: Rajith Attapattu
Assignee: Rajith Attapattu
Fix For: 0.7
When a subscription is created, message credits should only be set if the
session is active.
If not when the session is unsuspended message credits will be set again,
resulting in granting more credits than intended.
Steps To Reproduce
----------------------------
1. create a session with client ack
2. send 20 messages to a queue
3. create receiver with capacity (prefetch) as 10.
4. receive 10 messages
5. try to receive the 11th message
The 11th message should be null, if it isn't it means that we have received
more than 10 messages.
We should only receive the next set of messages if we ack the previous batch.
Ex. If we acked the 5th message, then we should get another 5.
Expected Result.
------------------------
At any given time we should only receive n messages, where n == maxprefetch
(capacity as defined for the destination)
Actual Result
-------------------
For the above conditions, we get double than what we want (provided the broker
has enough messages on the queue).
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