安全工作流任务分配策略

工作流系统访问控制为企业的工作流安全技术框架提供了可靠的保证。基于任务角色的访问控制模型通过任务将角色和权限联系起来．然后给用户指派合适的角色．用户通过其指派的角色获得可以执行的任务。然而在工作流多个任务实例同时执行过程中用户通过角色获得多个任务需要同时执行，如果用户执行的任务选择不当，将会导致工作流中某一任务实例中途挂起或夭折。本文根据工作流执行的特点．在基于任务角色访问控制模型的基础上，时工作流执行过程中任务实例出现的瓶颈问题进行了分析，提出了任务基本分配策略，事务任务，互斥任务，任务基数约束等分配方案，有效地提高了工．作流的执行效率。

Task Assigned Policy of Security Workflow

Workflow system access control provides reliable guarantee for workflow-security-technique framework of enterprise. Taskrole-based access control model is that roles and permission are not connected directly but are put together by tasks. However, while many task-instances ofworkflow are performing at the same time, users obtain many tasks to execute by role. If tasks that users will perform are selected incorrectly, this will make one task-instances suspended or come to an untimely end. Basing on task-role-based access control model and the characteristic of workflow performing, this paper analyzes the problem of bottle-neck while many task-instances of workflow are performing, advances rudimental assigned policy of tasks, transaction task, mutex-task, cardinality constraint of task, which can effectively improve executing efficiency of workflow.