BPEL4WS V2.0规范

Web Services Business Process

Execution Language Version 2.0

Primer

9 May 2007

Document identifier:

wsbpel-primer

Location:

Vaughn Bullard, Amberpoint <vbullard@amberpoint.com>

Thomas Erl, SOA Systems <thomas.erl@soasystems.com

John Evdemon, Microsoft <John.Evdemon@microsoft.com>

Ivana Trickovic, SAP <ivana.trickovic@sap.com

Danny van der Rijn, TIBCO Software <dannyv@tibco.com

The WS-BPEL 2.0 specification [WS-BPEL 2.0] provides a language for formally

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Table of Contents

1. Introduction................................................................................................................................. 6

1.1. Terminology......................................................................................................................... 6

1.2. Objective .............................................................................................................................. 6

1.3. Non-Normative Status ......................................................................................................... 6

2. History of WS-BPEL .................................................................................................................. 8

2.2. XLANG and WSFL .............................................................................................................8

3. Basic Concepts............................................................................................................................ 9

3.1. The Structure of BPEL Processes ........................................................................................ 9

3.2. Relationship to Business Partners........................................................................................ 9

3.4.6. Exception Handling .............................................................................................. 19

4. Advanced Concepts I ................................................................................................................ 21

4.1. Refining the Process Structure........................................................................................... 21

4.1.1. Lifecycle of a Scope.............................................................................................. 21

4.1.2. Scoped Fault Handling.......................................................................................... 22

4.1.3. Terminating Running Work.................................................................................. 22

4.1.4. Undoing Completed Work.................................................................................... 23

4.1.5. Event Handling ..................................................................................................... 24

4.2. Advanced Web Service Interactions.................................................................................. 24

4.2.1. Selective Event Processing ................................................................................... 24

4.5. Immediately Ending a Process........................................................................................... 32

4.6. Doing Nothing ................................................................................................................... 33

4.7. Data Validation .................................................................................................................. 33

4.8. Concurrent Data Manipulation .......................................................................................... 34

4.9. Dynamic Business Partner Resolution............................................................................... 35

5. Advanced Concepts II............................................................................................................... 38

5.1. Language Extensibility ...................................................................................................... 38

5.2. Abstract Processes ............................................................................................................. 40

6.1.4. Defining partnerLinks........................................................................................... 48

6.1.5. Defining partnerLinkTypes................................................................................... 49

6.1.6. Defining variables................................................................................................. 49

6.1.7. Using getVariableProperty function ..................................................................... 50

6.1.8. Defining Process Logic......................................................................................... 50

6.1.9. Defining a sequence activity................................................................................. 50

6.1.10. Defining an if activity ........................................................................................... 51

6.1.11. Defining a while activity....................................................................................... 51

6.1.18. Defining a reply activity ....................................................................................... 55

6.1.19. Elaborating and Refining Process Logic............................................................... 55

6.1.20. Defining a pick activity......................................................................................... 56

6.1.21. Defining a flow activity ........................................................................................ 56

6.1.22. Defining a wait activity......................................................................................... 58

6.1.23. Defining faultHandlers - catch, and catchAll ....................................................... 59

6.1.24. Defining a validate activity................................................................................... 59

6.1.25. Defining a compensationHandler ......................................................................... 59

7. What’s new in WS-BPEL 2.0 ................................................................................................... 61

8. Summary................................................................................................................................... 63