CWA 14923-8:2004

J/eXtensions for Financial Sevices (J/XFS) for the Java Platform - Part 8: Sensors and Indicators Unit Device Class Interface - Programmer's Reference CWA 14923-8:2004

Scope

This document describes the Sensors and Indicators Device Class ( SIU ) based on the
basic architecture of J/XFS 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 provides device communication that allows distribution of
applications and devices 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 reside in a central repository.
To support Sensors and Indicators Units, the basic Device Control structure is extended
with various properties and methods specific to this device which are described on the
following pages.