Implemented Single threaded Dispatcher,wrote test cases

I've implemented single thread dispatcher. If this is correct then I'll update it to concurrent version which I've started. I just wanted to confirm my approach.
Naming convention  - two different conventions (both wrong) immediately one below another.
Private variables are use camel casing prefixed with _. 
If you do not use an access modifier (public, private etc) on fields, they become private by default.