The Research And Design Of Fault_Tolerant System Based On ADS Middleware

With the rapid development of science techniques, computer has been applied widely, not only in the range of critical domains but also in common life. But there are many instance of serious consequence that happened because of non-dependence of computer system, so how to enhance the system reliability by fault-tolerant technique become the objective requirement of computer system.Fault tolerant technique is the techniques integration to maintain system work normally, when computer has abnormal behavior because of apparatus degradation, error input, external environment influence, primitive design error and so on. Generally, it is the kind of technique that make system run continually on the condition of failure. Faulttolerance of system can be realized by hardware and software techniques, the dependable techniques of hardware become mature enough, that makes software errors become the main reason of system dependability., so software fault tolerance has become a very hot topic.However, faulttolerance system are hard to be developed, since the programmers must handle not only the complex business logic but also the confused fault tolerant logic. As well all know, the development of system greatly benefit from the ADS middleware for its convenient development environment and transparent communication mechanisms. So a new kind of software fault tolerant structure based on middleware can reduce programmers' burden, assure software quality and improve software reliability on the basis of simplification and high efficient in system level.The thesis firstly analyzes the research situation and basic problems, chooses ADS technology as solution project, designs a kind of software fault tolerant system model based on ADS middleware, puts forward a new node fault tolerant structure, and forms a complete solution project including some key techniques of fault tolerance, such as redundancy, fault detection and recovery, finally makes a simulation which can verify the feasibility and reliability of this system.