Rule-based BPEL System using Aspect Oriented Programming

BPEL is a standard executable language for specifying actions within business processes with Web Services. BPEL workflow requires rule's engine to describe application process in BPEL, as the requirements increase. In this paper, we suggest the R4BPEL document, which uses the original BPEL grammer and includes a rule document. The system was implemented with AspectJ and B2J. AspectJ is an aspect-oriented programming extension for the JAVA programming language. As a result, it is possible to apply new rules to BPEL program without modifying the generated source code by B2J engine. And B2J is one of BPEL engines, It receives BPEL document, transforms it into JAVA source code, and compiles it to produce a JAVA target program. In this paper, we define generated source code of BPEL's requirement as core concern, and generated source code of R4BPEL's requirement as cross-cutting concern. The two concerns are weaved to generate rule-based BPEL program, which is the key idea of this paper. The method can use rules without modifying source code generated by B2J engine. By managing the rule document and BPEL document independently, it is possible to make a model of service using rules and to increase reusability of documents.