gsm.registerUtility(SimpleEmitter([dict(a=1), dict(b=2)]), IEmitter)

gsm.registerAdapter(JsonFormatter, (IEmitter,), IFormatter, 'json')
gsm.registerAdapter(StrFormatter, (IEmitter,), IFormatter, 'str')

my_emitter = gsm.queryUtility(IEmitter)
print my_emitter

my_formatter = gsm.queryAdapter(my_emitter, IFormatter, 'str')
print my_formatter