notification_connection

type NotificationConnection interface {
	// Listen starts listening a channel
	Listen(channel string) error

	// Unlisten stops listening a channel
	Unlisten(channel string) error

	// Close closes the connection
	Close() error

	// Ping the remote server to make sure it's alive.  Non-nil return value means
	// that there is no active connection.
	Ping() error

	// NotificationChannel returns channel for receiving notifications
	NotificationChannel() <-chan *pq.Notification
}