Rationale for using Access Transformers and byte code injection

[systemv]

Context: A coremod that loads plugins ala Cauldron, Sponge, Bukkit, etc..

 

What is the purpose and rationale for the core mod to do AT and byte code modifications to Forge events? I've read the how-to documents but I'm looking for information why this is important and necessary. 

 

Assume the core mod function is to hide Forge details from the plugin developer, what is the real purpose of the core mod internals to transform event objects? 

 

A pointer to a commonly used mod and explanation of what is gained (why it was designed) to use AT would be helpful.

 

Thanks

 

[Eternaldoom]

AT's and coremods are different things. AT's can be used to change the visibility of a field. Byte code modification is used to change vanilla behavior in ways that forge does not have events and hooks for.

[LexManos]

Its simple, don't do coremods or anything like that.

There are certian places where it is needed, but for those who dont know how to do them shouldn't be.