Optional second argument to a Subscriber callback.

type Method func (args ...interface{}) (interface{}, error)

Impelement Rate interface

A publisher which only sends to one specific subscriber. This is sent as an argument to the connect and disconnect callback functions passed to Node.

*defaultNode implements Node interface a defaultNode instance must be accessed in user goroutine.

The subscription object runs in own goroutine (startSubscription). Do not access any properties from other goroutine.