[ mx4j-Bugs-902819 ] Fetcher thread in RemoteNotificationClientHandler never ends

Bugs item #902819, was opened at 2004-02-23 11:56
Message generated for change (Settings changed) made by btscully
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=450647&aid=902819&group_id=47745

Category: JSR 160 Implementation
Group: Release 2.0.0
Status: Open
>Resolution: Accepted
Priority: 5
Submitted By: Chris Arrington (cdarring)
>Assigned to: Brian Scully (btscully)
Summary: Fetcher thread in RemoteNotificationClientHandler never ends

Initial Comment:
Submitter: Chris Arrington ([email protected])

Summary: RemoteNotificationClientHandler fetcher 
thread for remote notifications does not end after 
JMXConnectorServer is shutdown either gracefully or 
forcefully, using MX4J 2.0 beta 1.

Detail: When NotificationListeners are added via a 
remote MBeanServerConnection, tuples are added to a 
local Map with the listener objects. A fetcher thread is 
then started that polls the JMXConnectorServer 
periodically for notifications. This thread is ended ONLY 
as soon as all NotificationListeners are removed 
(RemoteNotificationClientHandler.java lines 133-135), 
based on the number of tuples (NotificationListener 
objects) in the Map. Ending the fetcher thread means 
that the user must be able to detect the lost 
connection, have all references to the 
NotificationListeners, and remove them all upon 
detecting the lost connection.

Even if the user were able to detect the lost 
connection, the order of calls in ClientInvoker (lines 91-
92) is such that the remote processing is called before 
the local processing which removes the 
NotificationTuples, which is what will allow for the ending 
of the fetcher thread. However, when the 
JMXConnectorServer is no longer up, the removal will not 
proceed past the remote processing, and the 
NotificationListeners cannot be removed. At the very 
least, if remote and local processing were reversed, 
there would be a possibility for ending the fetcher thread.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=450647&aid=902819&group_id=47745


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