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

Use Case ~ Travel Agency

[01]

[02] [03]

Use Case ~ Financial Institution

[06]

Use Case ~ Financial Transaction

[04]

[05]

Vendors

BEA's Weblogic stack

BEA's WebLogic Workshopprocess design editor

Vendors

The NetBeans BPEL editor.

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 Building-of Phase

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.