A Research And Design Of Communication Mechanism For Mobile Agent

The Mobile Agent, which combines Artificial Intelligence with distributed computing, with the development of internet, has more concern by people. It is one of the underlying technologies of new software framework, widely regarded as main stream of internet-based distributed computing mode. Mobile Agent can move from one node to another between hosts in heterogeneous networks to find right resources which are at the same hosts or subnet, then makes use of this advantage to behalf the users to complete assigned task, such as retrieval, filtering and collecting information, even engaging in commercial activities. Compared with methods, such as traditional RPC etc., it has the advantage of saving the broadband of the network, decreasing delay and supporting calculating off-line etc. These advantages of the Mobile Agent make it get fast development and it is widely used in a lot of aspect such as distributed information retrieval, e-commerce, work flow, personal assistant, etc.One of the important features of the Mobile Agent is its mobility, for the user, this feature improves the efficiency of task execution, but also results in the message can’t be received effectively, thus causes the communication invalidation and the failure in cooperating or even system breaks down. This is the critical defect of Mobile Agent system. So. the communication mechanism is the important subject.The following problems need to be considered when the Mobile Agent is communicating:Firstly, how to give a name for a Mobile Agent in distributed environment. Secondly, how to implement transparent locating of a Mobile Agent. Thirdly, how to resolve the communicating invalidation. For these problems, many researchers have put forward some kinds of solutions, for example. Broadcasting method, Home-based addressing, Link addressing, level addressing. Although these methods have their advantage, there are some disadvantages. After analyzing these communication mechanism, this paper basing EMFS give a new communication mechanism. This mechanism uses shortest path algorithm to give a best router and adds an Assistant Agent, in order to increase the restriction of autonomy and mobility to ensure the message reached successfully. This paper uses SPF algorithm and analyzes its feasibility in theory. In the experiment part of this paper, firstly using the OPNET simulation platform tests and compares the end-to-end delay in the network of RIP protocol and OSPF protocol based on SPF algorithm, the experiment result shows the network using OSPF protocol has a lower end-to-end delay, verifies the advantage of using SPF algorithm. For development of Mobile Agent, this paper uses Aglets platform developed by IBM, this platform is simple and practical, has lots of examples, then using Eclipse platform to develop and simulate the communication mechanism gave by this paper, building a foundation for the research in the future.