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Source Code of pre-existing preconditions and follow-up behaviors

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You can search for the extension point and search the implementers, find the class names from there and then search the Classes in the SDK. Follow https://rsjazz.wordpress.com/2015/09/30/learning-to-fly-getting-started-with-the-rtc-java-apis/ to set up your environment.
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Thank you. Because I am new to Eclipse, how would you search the classes in the SDK?

Nevermind. I found them.

Are there any .java files for the preconditions and follow-up operational behaviors?

If you follow https://rsjazz.wordpress.com/2015/09/30/learning-to-fly-getting-started-with-the-rtc-java-apis/ and do the extensions workshop you get your answers.