package mq

type Consumer interface {
	// RegisterMessageHandler is used to register message handler
	// any received messages will be passed to handler to process
	// once the Consumer started, it is forbidden to register handlers.
	RegisterMessageHandler(topic string, handler MessageHandler)

	// Start to consume messages
	Start() error
}

type MessageHandler interface {
	// HandleMessage process received messages,
	// if returned error is nil, the message will be auto committed.
	HandleMessage(msg *Message) error
}

type MessageHandleFunc func(msg *Message) error

func (fn MessageHandleFunc) HandleMessage(msg *Message) error {
	return fn(msg)
}