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Master’s Project Presentation

BPEL: Implementation of Software Management and Maintenance using

Business Process Execution Language for Web Services

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Credits

• Thanks to Dr. Mohammed Zubair

• Thanks to all who have answered my queries

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Objective

• Inspiration for this project : – Existing Software Configuration Management System (SCM)

tightly coupled– Automation available , however scope is very localized

• Purpose of the project :– Devise the SCM Process as a Web Service Model– Services available to anyone who needs SCM process

• Methodology Used:– Implement SCM as a series of web services and have the work

flow be controlled by BPEL orchestration.

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Introduction to Configuration Management

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General Definition of Configuration Management

• Configuration Management (CM) is an important process in the Software Development Life Cycle

• Official builds and release for products/components

• Fits between Dev cycle and QA cycle : {builds}

• Also plays an important role in release of products : {release}

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Need for CM ?

• Source code control/maintenance– Tracks the users who works on the code base

• Code reproducibility– Tracking features and bugs to specific time line in the

project’s life

• Build number responsibility– Separate numbers for each build– Used for release/patch purpose

• Maintenance of build environment– Different OSs, compilers, external tools etc

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Need for optimization of the CM environment ?

• Large number of products being built

• A single product being built on different Operating Systems (Windows, Solaris, Mac, etc.)

• A single product being built on different flavors of compilers (gcc-2.95.2, gcc-3.3.4, gcc-4.0.2 etc.)

• Product dependencies

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CM Work Flow

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Need for CM-BPEL ?

• Automation of CM process to increase the scope of its visibility.

• Modularity of Work flow : {Units}

• Units can be used by other projects : {Web service capability}

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Methodology

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Methodology for CM-BPEL

• Modularity – “Loosely coupled”*• Elements

– “Service Interface : where to call, what to call, format of parameters”*– “Service Implementation : functionality of the service”*

• Workflow oriented• May contain multiple services• Looking for Service Oriented Architecture (SOA)• Why SOA?

– Need to use resources across geographic location– Multiple organizations combining effort– Heterogeneous environment

* - “Making Transformation to Service Oriented Architecture, Capitalizing on Next Revolution in IT,

WebMethods.com”

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Business Process Management with SOA

• What is BPM?– Provides work flow/business service– Propriety software

• BPEL as BPM– New technology which is BPM with SOA model

• Why BPEL (Business Process Execution Language)?– Web Service model– Participants : IBM, Microsoft, Seibel, BEA Systems– Industry standard– Ease of developing Business Processes– XML based– Free concepts result is non-commercial use

• Sharing intellectual processes/data within/across research organizations

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General Understanding of BPEL

• BPEL : Business Process Execution Language• Draws inspiration from:

– WSFL[I] (Web Service Flow Language) by IBM– XLANG[II] by Microsoft

• Connects different web services– With in an organization– Across different organizations

• SOA: Shared services• Depends on

– WSDL 1.1 , XML Schema 1.0, XPath 1.0, WS-Addressing.

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BPEL Orchestration

• Orchestration design– Central process controls work flow– Participating web services do not know about

the participation– Highly modular design making it more efficient– Responsible for invoking the Web Services in

the order required by the business

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Overview of BPEL

Web Service1ws1.wsdl

Web Service2ws2.wsdl

Web Service3ws3.wsdl

Web Service4ws4.wsdl

B

P

E

L

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BPEL

WebService1

WebService n

Client

Receive

Invoke

Invoke

Reply

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BPEL variable-partner link

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BPEL – External Web Services interaction

• <variable> :– abstract data used in the process : {<variable

name="Invoke_1_process_InputVariable"/>}– messageType: refers to wsdl message definition {<variable

messageType="ns1:DetermineBuildNumberRequestMessage"/>}

• <partnerLinks> :– Web Services that take part in BPEL orchestation : {<partnerLink

partnerLinkType="ns1:DetermineBuildNumber"/>}

• Other tags : <receive>, <reply> , <invoke> ,<assign> <throw> ,<terminate>,<wait> ,<empty>, <sequence> <switch>, <while> ,<pick>, <flow>,<scope>, <compensate>

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BPEL – External Web Services interaction

BPEL

<variable messageType="ns1:DetermineBuildNumberRequestMessage"/>

WSDL in other web service

<message name="DetermineBuildNumberRequestMessage"><part name="payload"

element="client:DetermineBuildNumberProcessRequest"/></message>

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BPEL process control

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WSDL-BPEL interaction

• BPEL itself can be exposed as a web-service by WSDL

• Specifies entry and exit point for BPEL

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General Understanding of BPEL - wsdl

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WSDL-BPEL interaction

Web Service1ws1.wsdl

Web Service2ws2.wsdl

Web Service3ws3.wsdl

Web Service4ws4.wsdl

B

P

E

L

W

S

D

L

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Implementation of BPEL for Configuration Management

Process

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CM-BPEL Orchestration

WebUI(HTML Interface)

BPEL Orchestration

Determine Build Number

Build Unit

File Transfer Unit

Email Unit

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Implementation of CM through BPEL

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Project Demonstration

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Future Work

• Implementation on heterogeneous distributed system, OSs, Database

• Scale to accommodate any project that is being developed

• Access Control

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Learning experience

• Understanding the need for CM process to be more available for any software development process

• Understanding the BPEL technology• Advantages:

– Simple and powerful technology– Reusable model : transparent domain

• Caveats– New Technology : “transition may or may not happen soon” –

Challenges with Using BPEL : Guy Huntington, Huntington Ventures Ltd, “The Business of Identity Management”

– “Not all models can be converted to BPEL model” - Challenges with Using BPEL : Guy Huntington, Huntington Ventures Ltd, “The Business of Identity Management”

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Q & A Session

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References• http://www.oracle.com/technology/products/ias/bpel/index.html• http://www-128.ibm.com/developerworks/library/specification/ws-bpel/• http://www.alphaworks.ibm.com/tech/bpws4j• http://www.theserverside.com/articles/article.tss?l=BPELJava• Making Transformation to Service Oriented Architecture, Capitalizing on

Next Revolution in IT, WebMethods.com http://www1.webmethods.com/PDF/Making_the_Transformation_to_SOA.pdf

• [I] http://www-306.ibm.com/software/solutions/webservices/pdf/WSFL.pdf• [II] http://www.gotdotnet.com/team/xml_wsspecs/xlang-c/default.htm• Guy Huntington, Huntington Ventures Ltd, “The Business of Identity

Management”, “Challenges With Using BPEL”• Warren Buckley, Realizing the Power of BPEL,bpm.com• http://www.oracle.com/technology/oramag/oracle/04-jul/o44dev_web.html