Study And Implement On Embedded Middleware Supporting Wireless Communication

The genral distribute middleware considered the application which run in embedded device in wireless environment deficiently.Embedded middleware which supports wireless communication means a middleware platform which considering resource limited in the embedded environment, frequent disconnection in wireless environment and variety of network condition.In this paper we present embedded middleware which support wireless communication mostly aim at the characteristic of embedded device in wireless environment to design. These design resolved interlinkage, interconnection and interoperability problems of embedded devices in wireless environment. There are three points in the work:(1) We provide the reduced thread model for the limit resource of embedded device in wireless environment. It advances the utilization ratio of resource, through unifed manage of thread pool. And improve the speed of request deal because of avoided the thread context switch through assigned different role for threads in thread pool.(2) We present the FRTD (Fast Reconnect for Temporary Disconnection) mechanism in wireless environment. FRTD implements fast reconnection through giving every client a unique ID, client reconnect and resend request at disconnection moment and caching the results at server. FRTD assured the at most once semantic in request deal.(3) We extended the GIOP engine in CORBA to designed the GIOP engine based on UDP .aimed at the varity of network condition in wireless embedded environment. We make the UDP protocol satisfy the CORBA transport suppose through implement poor reliability control and byte-stream abstract.This thesis takes the 863 project "research of a new technology supporting real-time publish/subscrible pattern in middleware" as the background, and implement the design based on CORBA platform. Finally we do the test on the implement. The result present that the implementprovide right support for the application on the embedded device in wireless environment.