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05.03.07
JMS Event Gateways
By Sean Corfield
Expert Author
Article Date: 2007-05-03
Someone asked on the BACFUG mailing list if you could use
ColdFusion with MQ series to do JMS.
I responded that, yes, the example gateway supplied with CFMX 7 is
completely generic and should work with any JMS 1.0.2 compliant server.
However, there is not much documentation on this (it was just an example,
after all).
Each JMS server has its own custom libraries and classes so some people
just assume you have to write a custom gateway.
Not so.
You can just take the server-specific libraries and put them in the
ColdFusion class path and then specify the initial context factory
class (and the topic connection factory class) in the configuration
file.
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For example, to use the ActiveMQ server (Apache's free open source
JMS), specify this:
providerURL=tcp://localhost:61616
initialContextFactory=
org.apache.activemq.jndi.ActiveMQInitialContextFactory
topicConnectionFactory=TopicConnectionFactory
The config files provided with CFMX 7 as example have details for
JRun's built-in JMS server:
providerURL=localhost:2908
initialContextFactory=jrun.naming.JRunContextFactory
topicConnectionFactory=jms/jndi-TopicConnectionFactory
and Fiorano's JMS server:
providerURL=http://wtgdev5.macromedia.com:2001;
http://wtgdev4.macromedia.com:2002
initialContextFactory=
fiorano.jms.runtime.naming.FioranoInitialContextFactory
topicConnectionFactory=cn=primaryTCF,cn=
TopicConnectionFactories,cn=MsgHub,ou=EAI,o=Macromedia,c=US
In the latter example, Fiorano uses LDAP to locate the actual connection
factory object. The CFMX 7 JMS event gateway automatically supports
both approaches.
You can specify additional context properties for the server using
the contextProperties configuration parameter. You specify a comma-delimited
list of property names (in the config file) that should be read in
and added to the context map when creating the connection.
With Fiorano, for example, this allows you to specify how durable
consumers and publishers cache data.
The example gateway is very flexible and is intended to be used "out
of the box" with any compliant JMS server, without needing any code
changes.
That said, the gateway as it ships today supports topics with both
durable and non-durable consumers and publishers (if the JMS server
supports this). It does not support queues. It does not support message
selectors. It does not support transacted messages.
I'm hoping to have some news around that in due course (completely
independent of Scorpio, before you start speculating!).
Comments
About
the Author:
Sean is currently Senior Computer Scientist and Team Lead in the
Hosted Services group at Adobe Systems Incorporated. He has worked in
the IT industry for nearly twenty-five years, first in database
systems and compilers (serving eight years on the ANSI C++ Standards
Committee), then in mobile telecoms, and finally in web development.
Sean is a staunch advocate of software standards and best practices,
and is a well-known and respected speaker on these subjects. Sean has
championed and contributed to a number of ColdFusion frameworks, and
is a frequent publisher on his blog, http://corfield.org/
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