Hi Elmo, Sorry I keeps on bothering you. Hopefully I didn't interfere your normal work.
Ummm... It is a long story. In our project, we wish to use jBPM engine to process incoming events. We treat a ProcessInstance as the big boss. When the program starts, a ProcessInstance will be created, process something and reached a wait state. The most simpliest ProcessDefinition we have created is something like this. | <Start> ---> <Event Listener> ---> <Process it> ---> <End1> | ^-----------------------+ | The ProcessInstance will terminate when some conditions are fulfilled. Say it has received an END event. We do not exactly knows how many loops it will loop through. In above scenario, it will loop forever until the user issued the END event. The problem arise when using loop. If I draw the graph this way, allowing jBPM to handle the loop, it will break with StackOverFlow after a few hundred rounds. I tried to learn from jBPM source code, and I guess it is because the nodes are called recursively, causing function stack overflow. I tried to bypass this problem by saving the ProcessInstance into database (anyway, my project needs to save everything into the database to guard against system crashes). When it has finished one cycle, it suspends and flushes everything. Then when another event arrives, it loads back the ProcessInstance, puts the event into Context variable, and starts again. This method somehow works (of course the performance is horrible, we are not supposed to code like this), but the memory consumed will grow slowly, and the performance will gradually decline. About the connection, I am not sure. I have opened MySQL Administrator to have a quick check. It has 10 DB connections on average. Looks like Hibernate's connection pool has handled most of the problem. I don't know how to check the no. of connections in Hibernate. I will see if I can find it out. If the no. of Hibernate connections keep on increasing, then it can explain why the program gradually stall. Let me rework my code to see if it improves. Keep in touch. Thanks for your help. Philip View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3927339#3927339 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3927339 ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ JBoss-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/jboss-user
