Design and Implementation of A Listener Module for Handheld Mobile Devices1

1 This research is supported by State of Georgia's Yamacraw Research Contract #BLA42, #CLH49 and #DLN01. ABSTRACT We have developed a generic “Listener” module in Java called SyDListener, or “System on Mobile Devices (SyD) Listener Module”. It is designed and implemented as part of a software package we developed that is called SyDKernel. SyDKernel is a middleware package that can be used in developing distributed collaborative software applications in a rapid and modular way. Its executable code has a small size to fit in small devices like PDAs. Application developers use SyDKernel to easily implement distributed elements of an application such as two-way communication, resource sharing, collaborative services, directory listing, search and discovery services, and remote method invocations. SyDListener is a central module in SyDKernel, it provides a set of interfaces and classes that allows distributed SyD-based application components to communicate via remote method invocations seamlessly. SyDListener is implemented using TCP sockets for remote method invocatins and Java/RMI for locating methods. This paper describes the functionality, design rationale, architecture, and implementation of SyDListener.