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From David Martín Clavo (JIRA) <>
Subject [jira] Created: (AMQ-1361) Logging improvement contribution
Date Mon, 13 Aug 2007 11:16:02 GMT
Logging improvement contribution

                 Key: AMQ-1361
             Project: ActiveMQ
          Issue Type: Improvement
          Components: Broker, Transport
    Affects Versions: 5.0.0
            Reporter: David Martín Clavo
             Fix For: 5.0.0

Hello people,

After our proposal some time ago (view,
we would like to add a little contribution to the ActiveMQ code, and we hope that the ActiveMQ
developers and users like it.
We thought it would be good to improve ActiveMQ logging's capabilities, in order to make debugging,
tracing, and understanding ActiveMQ easier.
For this, we have added customization of ActiveMQ's Transport level logging, allowing users
to write their own logging formats. Also, we have added dynamic control of this logging functions
(via JMX). We have also developed a simple tool to analyze the log files produced.
We have split the contribution into 2 patches, one to add customized log formats functionality,
and the other to add dynamic management of logging via JMX. 1st patch is against SVN rev.
564978. 2nd patch is against 1st patch (incremental).

*A. New features*
(1) Logging enhancements (1st patch):
It is now possible to customize what will be written to the log file at transport level, by
writing a custom class which implements the new LogWriter interface.
Also, the option: logWriterName = name has to be added to a transport URI to choose which
class (format) will be used (more details on how to implement your own class / format later).
To activate transport logging, the trace=true flag has to be used.
People who don't want to use the new functionality will not have to change their URI's.

(2) Dynamic control of logging enhancements (2nd patch):
(a) Added ability to reload file to the BrokerView MBean.
(b) If the option dynamicManagement=true is appended to the URI, transport logging can be
managed through JMX:
	-Logging can be switched on / off for every transport or for all of them at once.
	-If the option startLogging=false is appended to the URI, a transport will initially not
log, but a TransportLogger instance will be created, and later it can be activated by JMX.
	-Another option lets the user change the JMX port used for these functions.

(3) Log parsing and analysis tool:
The tool parses log files (any number of them) of the CustomLogWriter format (our own implementation
of the LogWriter interface) and has the following features:
(a) The tool detects incorrect situations at Transport level: sent but not received messages,
duplicate messages at transport level.
(b) The tool can show the communication sequence for a message ("travel path" of a message).
(c) Other features:
	(c1) Loading of log files is done by choosing a directory with them.
	(c2) Incorrect features can be filtered per type or per connection.
	(c3) Long, hard to read connection / client IDs can be replaced by short, easy to compare
	(c4) Summary of connections, producers, consumers, log files.
Some screen shots are included.

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