Research On Recovery Strategy For Service-oriented Workflow

Currently, workflow technology is far more widely applied in E-commerce and E-government. It is the core technology of business processes'modeling, simulation, optimization, and management. The implementation of workflow management technology in enterprises and institutions is very important for China's informationized and standardized managment. During the running of workflow, abnormal operations of workflow processes may arise due to the workflow itself, server error or database misoperation. Therefore, the fault handling in workflow management system is an important component to ensure proper and effective operation of workflow.Firstly, this paper studied the transactional characteristics of the workflow and some strategies of the workflow error recovery, combined with practical problems, raises strategy and mechanisms for failture compensation. The algorithm is based on the dynamic implementation of history, generating compensation plan, limiting the compensation range to the lowest possible level within the block structure, and reducing the compensation range effectively.Secondly, this dissertation designs Fault Handling System, including fault monitor, compensation path generator and compensation path actuator. According to the returned information, the fault monitor monitors the operation of the running process. In case of misoperation, the workflow engine can temporarily stop running the process case, inform the exception handler which correspondingly makes decision and performs the handling strategy and deals with it finally.