An Introduction to BPEL standard and its extentions - SoberIT

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1. INTRODUCTION1.1 BackgroundWeb Service Orchestration (WSO) provides the ability to integrate and assemble individual Web servicesinto standards-based business processes. It is a bridge to connect an enterprise’s Service OrientedArchitecture and a critical layer in the web services technology. To facilitate WSO, the Business ProcessExecution Language (BPEL) was created to standardize integration logic and process automation betweenweb services. Combination of business process execution standards and Web services promises todramatically reduce costs and provide broader interoperability and reusability benefits.BPEL or WS-BPEL permits orchestration of web services. While the obvious business activity of ahuman interaction and sub-process are not covered by BPEL. To support a broaden range of scenarios,several BPEL extensions were proposed, and in this paper BPEL4People and BPEL-SPE are beingdiscussed.1.2 Objective to review current BPEL and the proposed extensions General picture of BPEL, its extension BPEL4People and BPEL-SPE Specification of above standard Study the result of EU SUPER project1.3 Scope of this paper Basic concept of latest on BPEL related technology Simple case analysis1.4 Research problemIn this paper, I study the current BPEL standard and what can be achieved with it, as well as the proposedextensions and their improvement over the existing BPEL standards.1.5 MethodologyLiterature review is the main methodology used in this project. The sources for literature are from Internet,academic journals, books and thesis database.1.6 Structure of report1. Introduction of project2. BPEL and its application in business3. BPEL4People4. BPEL-SPE5. EU Super project6. BPEL case study7. Conclusion8. Reference
2. BPEL AND ITS APPLICATION IN BUSINESSWeb service is thought to be the next “great thing” in the area of e-commerce and system integration.However, Web service is merely “great technology” without a way for business to use it, unless there is acommon standard to orchestrate multiple services into business and audit/manage the results. BPEL actsas “glue” to connect Web services and cohesive business solution, enables the orchestration of tasks inweb-based services.2.1 What is BPEL?BPEL (Business Process Execution Language), also known as BPEL4WS or WSBPEL, is an XML-basedlanguage that allows business to describe inter or intra enterprise business processes that are connectedvia Web services. BPEL is the convergence of language features of IBM’s WebService Flow Language(WSFL) and Microsoft’s XLANG [1]. As an XML-based language, BPEL describes the logic tocoordinate Web services in a process flow. The XML grammar can be interpreted and executed by aBPEL orchestration engine, which controls all activities in the process [1].Many companies including IBM, Oracle as well as open source organizations have released BPELimplementations in their platforms and tools. The available BPEL engines includes Oracle BPEL ProcessManager, IBM BPWS4J, Apache ODE, ActiveBPEL, Twister [2]2.2 Why BPEL is needed?Traditional methods for business integration and process automation usually involve logic inside ofapplications designed to meet a specific business need such as ERP, supply chain, CRM. Thedevelopment, testing and making the change of such applications can be quite costly and complicated [1-4]. To solve the problem, proprietary Enterprise Application Integration (EAI) and Business ProcessManagement (BPM) emerged to raise integration and process automation into a new level of softwaretools [5]. But proprietary EAI and BPM are too expensive [5].XML-based Web services came into picture as a solution. However, Web services do not fulfill the needto integrate and coordinate business processes themselves. This is where BPEL appeared (Figure 2.1) [1,5].Adoption of Web services and BPEL enhances productivity, reduces operating costs and betters servicethrough process automation.
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