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  1.  Home
  2. RPG400-L
  3. September 2005

Re: Looking for Documentation: Plugin Architecture

You have a few approaches available:

1) Make each plug-in a separate program

2) Make each plug-in a separate procedure

3) Both of the above
In both cases you need an external repository to hold the definitions for each condition and which plug-in to invoke. If the plug-in is a program then a simple dynamic program call will work. If it is a procedure then you'll need to package them in one or more service programs. You'll have to use APIs to either invoke the procedure for you or return a pointer to the procedure.
See the QZRUCLSP API and the QleGetExp API in the Program and CL Command API section of the Information Centre.
A standard keyed database file would suffice for the repository but you could use other things like a user index.
Note this is not using 'call-backs'. A call-back is a function in your main or your plug-in that is callable from one of the other plug-ins. You may need to provide call-backs to complete this process and if so you would pass a procedure pointer to one or more call-back functions in the plug-in interface (or you could put the call-back functions in a service program and require the plug-ins to bind to it). Lots of options. 

Regards,
Simon Coulter.
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