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WS-BPEL 2.0 MyProcess
invoke
receive
receive
invoke
invoke
Handlers
faulthandler
eventhandler
faulthandler
compensationhandler
terminationhandler
eventhandler
PartnerLinks
PartnerLink Type
PortType 1
PortType 2
partnerlink
partnerlink
Variables42
WSDL Message
XML SchemaType
XML SchemaElement
PropertiesCorrelation Sets
Property 1
Property 2
StructuredActivities
if-elsewhile
scope
pick
sequence
flow
repeatUntil
forEach
BasicActivities
receive
reply
invoke
throw
exit
wait
empty
compensatevalidate
assign
rethrow
extensionActivity
compensateScope
WS-BPEL 2.0 BPEL is the Web Services
Orchestration standard from OASIS bee’•pel, bee•pel’, beep’•əl, bip’•əl,
ta’mātō, tō’måtō An XML-based grammar for
describing the logic to orchestrate the interaction between Web services in a business process
BPEL Historical Timeline
Dec 2000Microsoft publishes XLANG
March 2001IBM publishes WSFL
July 2002IBM, Microsoft and BEA converge WSFL & XLANG into BPEL4WS 1.0
March 2003BPEL4WS is submitted to OASIS
May 2003OASIS publishes BPEL4WS 1.1
April 2007WS-BPEL 2.0 released
BPEL Historical Timeline
Dec 2000Microsoft publishes XLANG
March 2001IBM publishes WSFL
July 2002IBM, Microsoft and BEA converge WSFL & XLANG into BPEL4WS 1.0
March 2003BPEL4WS is submitted to OASIS
May 2003OASIS publishes BPEL4WS 1.1
April 2007WS-BPEL 2.0 released
Motivation Integration continues to be a key problem facing
businesses Intra-enterprise integration (Enterprise Application Integration) Integrating with partners (Business-to-Business Integration) Syndication
Web services move towards service-oriented computing
Applications are viewed as “services” Loosely coupled, dynamic interactions Heterogeneous platforms No single party has complete control
Service composition How do you compose services in this domain?
Why the Need For BPEL? WSDL defined Web services have a stateless
interaction model Messages are exchanged using
Synchronous invocation Uncorrelated asynchronous invocations
Most “real-world” business processes require a more robust interaction model
Messages exchanged in a two-way, peer-to-peer conversation lasting minutes, hours, days, etc.
BPEL provides the ability to express stateful, long-running interactions
Why BPEL?
WS-* stack did not address conversation description Combines graph-oriented and block-oriented programming Supports the addressability of processes through data
they use Implicit creation and termination Parallelism
Flows Event Handlers Parallel ForEach
Abstract BPEL for observable behaviour and process templating
Why not BPEL?
BPEL is NOT for service creation Java Standard Edition Java Enterprise Edition .NET Adobe LiveCycle ES
BPEL is NOT a UI BPDM BPMN Adobe LiveCycle Designer
BPEL is NOT designed for choreography CDL
What’s New since BPEL 1.1
Data Access XSD complex-type variable Simplified XPath expressions Simplified message access on WSDL Elaborated <copy> operation behavior in <assign> keepSrcElement option in <copy> New <extensionAssignOperation> Standardized XSLT 1.0 function for use within XPath expressions XML data validation model New <validate> activity “inline” variable initialization at the point of variable declaration
What’s New since BPEL 1.1
Scope Model Elaboration of Compensation & Fault Models Scope Isolation and Control Links interaction in <flow> New <rethrow> activity <terminationHandler> exitOnStandardFault
Message Operations Join-style Correlation Set Scope-local PartnerLink declaration initializePartnerRole messageExchange construct
What’s New since BPEL 1.1
Other New Activities <forEach> <repeatUntil> <extensionActivity>
Syntactic [extreme] makeover <switch> -> <if>-<elseif>-<else> <terminate> -> <exit>
Other additions Improved event handling <repeatEvery> alarm feature <extension> directive <import>
WS-BPEL Schedule
Status OASIS standard - April 2007 Approximately 20 current TC members
Down from several hundred Five organizations have certified use of
WS-BPEL in product ActiveEndpoints, IBM, Intalio, SEEBURGER, Sun
Adobe a member of the TC since 2003 Active participation Spec editor
WS-BPEL Schedule
Next steps OASIS Symposium - April 15-20, 2007
San Diego, California, USA Business Process Sessions - April 16 Lightning Rounds – April 16 Mini-Talk – April 17 WS-BPEL Workshop - April 18
Start using WS-BPEL today
