get implementation delegating to the protocols; _check_channel_args slightly adjusted; added _check_get_args, which is called by get
get implementation delegating to the protocols; _check_channel_args slightly adjusted; added _check_get_args, which is called by get

ooici/coi-services,ooici/coi-services,ooici/coi-services,ooici/coi-services,ooici/coi-services