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I am adding an event driven plugin api to a web based system I am working on.
Should I wrap the plugin calls in a try/catch to make sure they don’t crash or should I leave this up to plugin developers to take care of.
Also, some of the plugins may change the data I pass them, should I re-validate all the data or trust the plugin developers not to break anything?
You should not let your program crash.
If you can protect yourself from innocent mistakes by plug-in writers, you should do so – both by handling exceptions and by revalidating modified data that your code must reuse.
What you do when you find a problem (exception or malformed data) is up to you – unloading the plug-in and not using it again until it is reloaded might be sensible in production mode. For plug-in developers, providing good diagnostics of what went wrong would be sensible – possibly even crucial to gaining widespread acceptance (lots of people writing plug-ins for you). If the other programmers cannot resolve problems effectively, they may not continue to try.