CDEV: An Object-Oriented Class Library for Developing Device Control Applications

摘要

The Control Device API (CDEV) is a highly modulated and extensible object-211u001eoriented C++ class library that provides a standard interface to one or more 211u001eunderlying control or data acquisition packages through a common framework into 211u001ewhich system developers can customize code. It defines a set of abstract classes 211u001efrom which a new CDEV servicelayer can be developed by inheritance and accessed 211u001ewith the same API through run time dynamic binding. All I/O in the system is 211u001ehandled as synchronous or asynchronous messages to devices that may span multiple 211u001eservices. CDEV routes messages to appropriate services by a name service and 211u001edispatches multiple services to handle service specific I/O events. In addition, 211u001eCDEV handles data transfer through a data object that may contain multiple tagges 211u001evalues of different types, allowing flexible I/O between clients and servers. 211u001eThis paper presents the design, implementation and current status of CDEV, and 211u001eshows that CDEV can be a starting point to achieve the goal of sharing software 211u001ein control system applications.