Veriables changing detection

Question

Hi, all,
Suppose there is a java application which is running on Unix or windows platform.The application contains some dynamic changing varables, and they are changing when the application is running.
Now I need to make a java monitor to detecte the variables changing in the above application. once some variable changing happens, the monitor can capture this change. So, what technique should I use? What is going to be API? How can I access the application's variables? Can anybody give me some idea or some references? Thanks in advance.
Day

Answer 1

A good question would be, Do you on having your monitor run in the same virtual machine as the subject application? If yes, then running the application would also load the monitor and you could use a simple observer pattern to watch for changes. If not, the monitor would be run as a seperate application and you could use JMS or something similar to communicate between the two. In that case, the observer would still need to alert the monitor of any changes, so this is not really the best solution, but it makes it easy to turn the monitor off if you don't need it.
I've never used JMS or a custom observer pattern, so I only understand it in the abstract of communicating between running applications and responding to changes, but this should be all you need.