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This document describes the Scanner device classes. These classes are basic on the J/XFS architecture which is similar to the JavaPOS architecture. It is event driven and asynchronous. Three basic levels are defined in JavaPOS. For J/XFS this model is extended by a communication layer, which allows applications and devices to be distributed within a network. So we have the following layers in J/XFS: • Application • Device Control and Manager • Device Communication • Device Service Application developers program against control objects and the Device Manager which reside in the Device Control Layer. This is the usual interface between applications and J/XFS Devices. Device Control Objects access the Device Manager to find an associated Device Service. Device Service Objects provide the functionality to access the real device (i.e. like a device driver). During application startup the Device Manager is responsible for locating the desired Device Service Object and attaching this to the requesting Device Control Object. Location and/or routing information for the Device Manager resides in a central repository. To support Scanner devices the basic Device Control structure is extended with various properties and methods specific to this device type. The extensions are described on the following pages.
|Engelse titel||J/eXtensions for Financial Services (J/XFS) for the Java Platform - Part 13: Scanner Device Class Interface - Programmer’s Reference|