Apama Documentation : Developing Apama Applications : Developing EPL Plug-ins : Introduction to EPL Plug-ins
Introduction to EPL Plug-ins
In order to incorporate existing specialized functionality, you can write EPL plug-ins in the following languages:
*C++: An EPL plug-in consists of an appropriately formatted library of C++ functions, which can be called from within EPL code.
*Java: The Java classes that are called from an application's EPL code are contained in a jar file.
The correlator does not need to be modified to enable or to integrate with a plug-in, as the plug-in loading process is transparent and occurs dynamically when required.
Custom EPL plug-ins can be developed using Apama's EPL plug-in APIs for C++ and Java. Once a plug-in is developed, you can call the functions it contains directly from the EPL code, passing EPL variables and literals as parameters, and getting return values that can be manipulated.
Note:  
It is very important that strict plug-in development guidelines are followed when developing a plug-in. The functions provided must be adequately debugged prior to their integration within a plug-in. This is because when the correlator loads a plug-in, it is dynamically linked with the correlator's runtime process. If any code within the plug-in causes a runtime error, the correlator might fail and terminate.
For this reason, Apama customers who experience problems with correlator stability while using plug-ins will be asked by Apama Technical Support to remove the plug-in and reproduce the problem prior to being offered further technical help. Apama Technical Support will only lift this restriction if the plug-ins have had prior certification by Apama.
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