Allow viewing of channel flow control status via JMX Management Console
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Key: QPID-2178
URL: https://issues.apache.org/jira/browse/QPID-2178
Project: Qpid
Issue Type: New Feature
Components: Java Management : JMX Console, Java Management : JMX
Interface
Reporter: Robbie Gemmell
Assignee: Robbie Gemmell
Fix For: 0.6
When Flow Control is being utilised on the broker, it may be useful to expose
the status of a channel (based on thevalue of _blocking in AMQChannel) as a
read-only property via the management console.
Channel properties are currently only exposed by the broker over JMX via the
ManagedConnection mbean interface which defines a channels() method implemented
in the AMQProtocolSessionMBean, that returns a data set consisting of channel
id, transactional status, default queue, and number of unacked messages for all
channels on the connection. In order to expose the flow controlled status of
the channel, this result set would be expanded to include the value of the new
_blocking AtomicBoolean within AMQSession.
Expanding the result set would not affect compatability with the older console
UI, which should automatically display it thanks to its completely generic
construction. The new console UI utilises this particular information set quite
differently in order to construct a structured table and would not make use of
the additional information until modified to do so (its presence would not
interfere until that time, it simply wont be utilised) by performing a small
update to add a new table column when the additional information is available
on supporting brokers.
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