Methods and apparatus for managing sequencing of data received from devices in a retail point of sale system

摘要

Techniques for managing data received from devices in a point of sale system are described. A point of sale system is operated utilizing independent software objects including a device sequence manager. The device sequence manager communicates with each device producing data for which proper sequencing must be maintained. Upon receiving a data event from a device, the device sequence manager creates a data object and stores the data object in an output queue. Upon receiving a request for data from an executive application, the device sequence manager retrieves the data object from the output queue and transfers it to the executive application, maintaining the sequence in which the data objects were received from the devices.