Web Service Composition mit WS-BPEL und dem Open-Source-Orchester Tammo van Lessen Daniel Lübke Simon Moser

BPEL Background & Motivation

The Base: Service Platform Messaging Quality of Service Transport Description Transports Interface + Bindings Composite XML Non-XML Security Policy Discovery, Negotiation, Agreement Atomic Orchestration Protocols State Components Reliable Messaging Transactions

The Base: Web Services Messaging Quality of Service Transport Description HTTP, SMTP, XMPP, TCP/IP, FTP, Tuple Spaces,… WSDL Composite SOAP, WS-A JMS, RMI/IIOP WS-Security* WS-Policy* UDDI, WS-A, WS-MEX, WSIL Atomic BPEL WS-C, WS-CDL, BPEL4Chor WSRF Components WSRM WS-AT, WS-BA,…

Why Orchestration? ??? To achieve a business goal, you often need more than one service… Which to use, in which order, how to use them?

Web Service Orchestration BPEL!

BPEL 2.0 Activities compensateScope compensate Basic Activities Structured Activities receive reply invoke assign validate throw rethrow exit wait empty extensionActivity forEach sequence 2. N. 1. … flow B C A while c repeatUntil c if-elseif-else c1 c2 … 2. N. 1. … pick … A M2 M1 scope

Fault and Compensation Handling

Modeling Styles: Example

BPEL Open Source Orchestra

Test Structure BPEL BPELUnit Real Services deploy <soap> <soap> <soap> <soap> Client Mock A Mock B <soap> undeploy Eclipse Ant Command Line Deployer (optional)

Tammo van Lessen (IAAS, Uni Stuttgart) & Simon Moser (IBM) Demo

Q&A Thank you for your attention!