I have an issue with a 3rd party DLL, which is NOT thread-safe, but which I need to call within an orchestration.
I'm making the DLL call within an Expression shape. The same DLL is called in a number of different orchestrations.
The problem I have is that for a series of incoming messages, BizTalk will run multiple orchestrations (or multiple instances of an orchestration) in parallel - which leads to exceptions within the DLL.
Is there any way around this, given that refactoring the DLL isn't an option. Or, is there a way to throttle BizTalk to only run one orchestration at any one time. (I've seen some hacks restricting the working pool to the number of processors, but this doesn't seem to help. We can't downgrade to a single-core machine!)
I would rather find a way of keeping the DLL happy (though I can't think how) than throttle BizTalk - but if there is a way to throttle that would be an acceptable short-term solution whilst we discuss with the 3rd party. (who are a large organisation and really should know better!)