Emerging Technology
Business Process Execution Language (BPEL)Team 1
Members Kevin Gravesande, Steve Kim, Rasal Mowla, Al Resptrepo, Carlos Thomas, and Scott Weaver
Introduction
Web services can facilitate seamless business-to-business integration
The business process execution language for web services (BPEL) is a standard for business process and integration protocols for web services
The objective of these technologies is to automate process execution across people and systems
Introduction
The BPEL specification was written by Microsoft, IBM, and BEA
BPEL processes consist of web services definition language (WSDL) and BPEL files
BPEL process can define a set of variables and pass those variables as inputs\outputs to web services
Processes can be bound to the input of a inbound activity, output of a synchronous invoke & assigned a value with the assign activity
How BPEL Works
First, a recap of the Loan Scenario Traditional Method
A client visits a loan officer at the loan office Loan officer gathers information Loan officer searches for best loan available Contacts client
Intermediate Step Offer loan requests online Problem – only gathering of information is
automated.
How BPEL Works
BPEL automates the whole process Accepts the client request Forms a request to financial institutions Waits for responses Picks the best offer Crafts a reply to the client.
How BPEL WorksThe Building-of Phase The design,
development, and deployment environment
Developers and Business Analysts Tools Graphic tools (i.e. plug
in for Eclipse) Full blown stand alone
environment such as Oracle’s BPEL Process Manager
How BPEL WorksThe Execution-of Phase Consists of a BPEL Server, contains
the business process definitions a Web Services framework the BPEL execution engine
Clients access the system through the Client Services
Other institutions access services through Partner Services
Building a Business Process
BPEL uses Web services Definition Language (WSDL)
A BPEL process consists of defined steps; each step is called an ”activity.”
BPEL supports primitive <invoke>, <receive>, <reply>, <assign>, <throw>
as well as structure activities <sequence>, <flow>, <switch>, <while>, <pick>
BPEL process also defines defines partner links, using <partnerLink> declares variables, using <variable>
BPEL Specification
BPEL4WS is layered on top of several XML specifications: WSDL 1.1, XML Schema 1.0, and XPath1.0.
BPEL4WS does the followings: defines a model and a grammar for describing
the behavior of a business process defines an interoperable integration model introduces systematic mechanisms for dealing
with business exceptions and processing faults.
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