Detail Information about JCEF

Hey, I am new to JCEF and I am trying to understand things. I know this is the port of original chromiumembedded/java-cef, so we don't have documentation for this except this Embedded Browser (JCEF) | IntelliJ Platform Plugin SDK. 

I have some questions please bear with me(cause i dont have some but many):

1] What is the architecture of JCEF? I am on a project which uses CefSharp and we are migrating to JCEF, in CefSharp I can see like there are methods which gives information about Renderer like OnContextCreated() of IRenderProcessMessageHandler  but I don't see any in JCEF.

2] What is this RequestContextHandler in JCEF? The information is not much clear (might be I am not able to understand).

Thank you for understanding and helping. Waiting for every information/help I can get, Thank you.