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@(#)README	1.6 09/14/04
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Broker Monitoring API examples

Description
-----------
This directory contain examples that demonstrate the GlassFish(tm)
Message Queue broker monitoring API. The examples consist of separate 
applications each showing how to subscribe to and receive different monitoring 
information from the broker.

Files
-----
BrokerMetrics.java	Source file for monitoring application that
			displays broker metrics.
DestListMetrics.java	Source file for monitoring application that
			displays destination list metrics.
DestMetrics.java	Source file for monitoring application that
			displays a specific destination's metrics.
MetricsPrinter.java	Utility class used for printing in neat columns.
MultiColumnPrinter.java	Utility class used for printing in neat columns.
VMMetrics.java		Source file for monitoring application that
			displays broker VM metrics.
*.class			Prebuilt Java class files for these examples.
README			This file.

There are four different types of monitoring information 
that a JMS application can subscribe to on the broker.

The example applications consist of four JMS applications,
each demonstrating, for each of the different monitoring types:
- how to subscribe to the relevant monitoring topic
- how to process the received monitoring messages

Here are the different monitoring types and a summary of information
that is available:

Broker metrics
  Cumulative number of messages/packets flowing in/out of broker
  Cumulative sizes of messages/packets flowing in/out of broker
  Connection/destination counts

Destination List
  List of destinations on the broker

Destination metrics (information here is for a specific destination)
  Current/average/peak counts of active/backup consumers
  Cumulative number of messages flowing in/out of destination
  Cumulative size of messages flowing in/out of destination
  Current/average/peak counts of messages, 
  Current/average/peak total size of messages
  Disk usage

Java VM metrics
  JVM memory heap size: max, total, free

Configuring the environment
---------------------------
To recompile or run this example, you need to set CLASSPATH
to include at least:
    jms.jar
    imq.jar
    directory containing this example

A detailed guideline on configuring your enrivonment and setting CLASSPATH 
is found in the top-level README file of the examples (demo) directory of
the Message Queue installation (<IMQ_HOME>/examples/README) as well as in
the "Quick Start Tutorial" in the GlassFish(tm) Message Queue 
Developer's Guide.

Building the example
--------------------
Compile the sample programs individually if you wish, or all at 
once by using the command

    javac *.java

Running the example
-------------------
The examples can be run using the java command e.g.
 
    java <classname> <options>

For example,

    java BrokerMetrics

By default all monitoring examples will connect to the broker running on localhost:7676.
You can use -DimqAddressList attribute to change the host, port and 
transport:

    java -DimqAddressList=mq://<host>:<port>/jms DestMetrics -t q -n SimpleQueue 

Here is a description of each of the examples:

BrokerMetrics
-------------
This application displays broker metrics. It also
shows how to calculate rate information, similar
to what is displayed by the command:

 imqcmd metrics bkr -m rts

This application takes the following options (similar to
imqcmd):

 -m ttl   Show totals e.g. total/accumulative number of msgs
          that flowed in/out of the broker. This is the
          default.
 -m rts   Show rates e.g. rate of message flow in/out of
          broker.

Example usage:
    java BrokerMetrics
    java BrokerMetrics -m ttl
    java BrokerMetrics -m rts

DestListMetrics
---------------
This application displays the current list of destinations
on the broker.

Example usage:
    java DestListMetrics

DestMetrics
-----------
This application displays the metric information for a specific
destination. It simulates the following command:

$IMQ_HOME/bin/imqcmd metrics dst -t <dest type> -n <dest name>

The destination can be specified using the same options as imqcmd:
 -t   Destination type (t or q)
 -n   Destination name

Example usage:
    java DestMetrics -t q -n SimpleQueue
    java DestMetrics -t t -n SimpleTopic

VMMetrics
---------
Displays the free, maximum, and total memory used by the broker JVM.

Example usage:
    java VMMetrics
