Research on Open SaaS Software Architecture Based on SOA

Software as a Service (SaaS) provides the same instance of an application to multiple customers typically in a single-instance multi-tenant architecture mode, achieving a low cost, economies of scale. However, SaaS applications also face the three most important challenges : multi-tenant, configurable and extensible. While the current SaaS applications delivers standardized functions, this architecture does not match the dynamic business environment which demands flexibility and innovative approach to interactive requirements. This paper presents an open architecture to build SaaS solutions, the combination of SOA and EDI reference models to create a clear reference architecture, automatic path between the business specification layer and the technical implementation layer, tenants can take part in the design of business processes and we describe how individual services join the SaaS applications.