Frameworks of Composite Services Execution Engine with Feedback Control

According to the SOA, we proposed the framework of composite service execution engine WebJetFlow. In this framework, to guarantee the response time from different services of different levels, we designed and implemented the flow execution structure with dual feedback control loops, which are in the process executor and service proxy respectively. Moreover, we separated process executor and service proxy to decouple process execution and service invocation. The new idea of this paper is that decoupling method improves the efficiency and throughput of the engine, and introduces the feedback control mechanism that enables the engine to provide response time guarantees for different services even when load varies significantly.