The Migration Service Mechanism In The Workflow System

Migrating workflow is a new technology applying mobile computing to workflow management. According to migrating workflow technology, several migrating instances complete workflow by migration and coordination, which are obtained from the projection of activity in workflow business procedure. The three essential factors of a migrating workflow system include migrating workflow management engine, migrating instance and workplace. The management engine is in charge of workflow procedure definition, migrating instance's generation and the coordination of many migrating instances. The workplace refers to the anchorage server and work-machine network, while the anchorage server is the executing place of migrating instance, and work-machine provides workflow services to migrating instance. Migrating instance accesses workflow services through anchorage server by means of object reference.In a migrating workflow system, workflow services are provided by the workplaces with different structures in different places. So the migrating workflow service is different from the workflow executing service in traditional workflow systems. It has its own characteristic. Firstly, the workplace is a distributed environment with different structures. How to organize and use workflow services is important in the workplace because it impacts the executing efficiency and the reliability of the workflow executing service. Secondly, the workflow services of semantic affinity for migrating instances and workplaces is needed in favor of making the migrating decision and realizing the mapping from the task specification to the workflow service.Based on the characteristic of the migrating workflow service, the paper researched the service mechanism in migrating workflow system. It discussed the service strategy including the service organization, deployment, providing and publication and proposed a migrating workflow service model based on ontology. It resolved the questions that what services is provided in this workplace and how to provide services.The paper summarized the actual service strategies in the workflow management system. And according to the characteristic of the migrating workflow, it researched the adopted service strategy in workflow system. These strategies include the service...