Interfaces

HttpKernel from Symfony2

because we do not need to reinvent every wheel

PSR-3 Log

because we are enterprise so use language "standards"

$serphplet->appendLogger($logger);

Dispatcher

to dispatch the requests that belongs to that SerPHPlet

$serphplet->dispatch($marshalledRequest);

Injector

to inject external dependencies that are needed based on names this dependencies are defined in the servlet container