Communication Research Of Migrating Workflow And System Design And Implementation

The migrating workflow, which is proposed based on the mobile computing model, is a new direction within the workflow management research. In light of the complexity of the business process goal, the workflow is mapped to one or more migrating instances (MI), which are the main execution bodies. Each migrating instance is corresponding to a single business sub-process and can complete one or more tasks with local services and resources in one workplace. Multi migrating instances complete the whole business goal by migrating and cooperation with the support of anchorage server. If the current workplace can' t afford the further task execution, migrating instance will migrate to the next workplace for continuous execution with the task specification and previous execution results.This paper presents an extendable, customizable and reconfigurable cooperation product commerce system based on the conception of migrating workflow service according to the conception model of migrating workflow and the referrence frame of migrating workflow system. The system is made up of four parts. They are migrating instance, anchorage server, working machine network and application requirement framing for client. The system adopts microkernel pattern architecture and component technology. The user can deploy the four part on the same or different servers according to the demand and can append, delete or replace the service components as the time of the system working without affecting the running of the application. And the system suits the change of environment and its own workflow application. The user can dynamically adjust the organization model of the service so as to suit the dynamic change of the application demand. Because of the migrating instrance'migration its place isn't fixed.And the network is also changeful. Those brings a difficulty to the communications between the migrating instrances. So this paper presents a new message communications mechanism between the migrating instrances. The communication way can simplify the steps of the address search and solve the annulment problem of mails to keep the accuracy of the mails while MI can move on its own without limiting at the communication stage. It also can keep the sequence of MI mails and basing on the way of the mails' separation the mails can de dealed with at the same time of the moving state of MI. Furthermore, the wrong mails can be delivered again through the verifying for the accuracy and completeness of the mails.In the end , this paper presents a project for the realization of the four parts to migrating workflow system and makes some amelioration and innovation to the structure of the system. It gives a detailed program to the flow of the migrating workflow system as a whole and makes the system each parts correspond well.