NewAck returns an Ack response type.

NewError returns a response that wraps an error (nil error signals successful receipt).

NewNoack returns an Ack response type.

NewUnack returns an Unack response type.

Errors for response types.

Ack is a response type that indicates the message has reached a destination and can be acknowledged upstream.

Error is a response type that wraps an error, this error will be interpreted as a failed message signal if the error is non-nil, a nil error indicates the message has successfully ended up somewhere and can be acknowledged upstream.

Noack is a response type that indicates the message has failed to reach a destination.

Unack is a response type that indicates the message has reached a destination but should not yet be acknowledged, if possible.