The Study Of Soa And Eda Based It System Simulation Technology

With the continuous expansion of enterprise business, software systems which involve more and more heterogeneous system become more complex, it become a problem how to integrate these heterogeneous complex systems. Enterprise Application Integration not only provides interconnection between systems at a low-level application, but also realizes business process management between enterprise inner applications and inner to other partners'applications.But as complex of business processes and needs of change and innovation, enterprise applications need significant changes, and SOA (service-oriented architecture) model was born. SOA model treat service as the core concept, it integrate enterprise's IT resources into operational service, and link up these loosely coupled services to counter the complex of enterprise business.Although the SOA model can packages these enterprise resources to services which are reusable and easy to process scheduling, but it can not improve the system response sensitivity. EDA (Event Driven Architecture) may well make up for this shortcoming, and it forms a new mode of enterprise application integration framework-based on event-driven SOA (EDSOA) architecture with combination of SOA.When we develop a system using event-driven SOA Architecture, we can use simulation technology to build the system virtually for analysis, for example, analysis of the life cycle of systems, security, reliability, system quality. It will help us to evaluate and optimize the system to be established.This paper describes the modeling of discrete event systems approach and discrete event system specification; study the knowledge of service-oriented architecture and event-driven architecture, and discussed the relationship between the two; Construct a publish/subscribe architecture based on event-driven SOA architecture, and use discrete event system specification to describe this model; make simulation to an ordering system based on the publish/subscribe architecture using object-oriented discrete event simulation tool DEVS-Suite.