The Studying And Application Of Middleware Platform's Ordinary Algorithms Library In Communication Terminal

In an embedded system with distributed architecture,the embedded devices communicate with each other to accomplish a complicated task together in a collaborative way. However, the differences between the embedded system platforms become an obstacle to the communications of embedded devices.If using traditional software method to solve the problem, some other problems will arise. One is that specific code was needed for different embedded devices and this will lead to poor reusability, scalability, and portability. Meanwhile, different embedded software development involves some common code that manage resource in low level, such as thead scheduling,network connection, and memory management, etc. The repeating development of these code will lead to high cost,long period and reduce the cost-effective of embedded software.To solve above problems, the middleware idea was introduced into embedded system.Middleware is a very effective and high performance framework for distributed application integration. But with the development of applications, a growing class of large scale scenarios require real-time support, such as military command and control system, telecommunication monitor system and multimedia system. Therefore, the research of the real-time middleware becomes a hot and difficult problem in the field of middleware study recently.Real-Time middleware needs to provide foreseeable of the end to end, which puts forward the new challenge to the traditional middleware, but in order to implement the aim of the foreseeable of end to end, the real-time middleware resources management and the organize model of file system is two important parts, because the real-time middleware monitor needs the strictly resources concrol and rapid and high-effective file operating. On one hand, real-time middleware must guarantee the full exploitation of the resources and adaptive resources management mechanism, on the other hand ,must provide the high-effectivity in storage and searching within file system.Firstly,this article introduces the middleware in the system angle,include the concept,ramework,sorts and fuction.basing these,the article present the system structure of ARTS-ORB,furthermore,it presents task character,property and structure of ARTS-ORB.secondly,this paper studys the real-time of middleware in the task attemper and resource attemper.puts forward the method of resource attemper which is bases on event.thirdly,this article reserches the real-time from file system.After studying the performance of traditional file system, this thesis advances the hash organize modle which is based on the haffem tree.finally,this discourse works over the middleware within the network.Introduces data structure of HTTP protocol.also studies the main three protocol.