A side-project I’ve been playing with in the evening: Writing a JMX layer to allow apps written for ActiveMQ to migrate to WebSphere MQ with minimal modifications
This came out of working on something that uses a JMS messaging provider. It uses it internally to allow components to communicate with each other, even when spread across multiple machines.
It uses Apache ActiveMQ – an open-sourced implementation of JMS. I wanted to try and get it working using WebSphere MQ – IBM’s implementation of JMS that I used to work on until five years ago.
As a messaging standard, the fact that both ActiveMQ and WebSphere MQ (WMQ) are JMS providers means that the way it puts and gets messages should just work.
But the JMS standard doesn’t cover administration (how queue managers are created and configured, how they’re started, how queues and topics are created, etc.) or monitoring (getting statistics about how many messages have been put or got, how many messages are on a queue, etc.)
All of this was done in an ActiveMQ-specific ways. This was what needed to be ported if I was going to get this to work with WebSphere MQ.
The project I’m porting is actually a bit of a black box. Rather than make a significant rewrite to get it to go from being ActiveMQ-specific to WMQ-specific, I wanted to see what I could add so that as much of the existing code could just work transparently.
I wanted to write a layer to sit between the ActiveMQ-app and WebSphere MQ, so that the app needn’t realise it’s not talking to the ActiveMQ broker it was written for.