Fall 2007 1 CIS 764 Database Systems Engineering L12.2: Web Services ++ Web service as an enterprise “component” Distributed business.

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CIS 764 Database Systems Engineering

L12.2: Web Services ++

Web service as an enterprise “component”

Distributed business processes build using web services.

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CIS 764 Database Systems Engineering

Objects, components, web-services:

R. Sessions,  "Fuzzy Boundaries: Objects, Components, and Web Services", ACM Queue, Jan. 04 http://www.acmqueue.org/modules.php?name=Content&pa=showpage&pid=246

  factors: location , environment, protocol:

  * entity and the client  in  same process  =>   objects

  * different processes, same environment  =>   component

              (EJB,  dotNet managed components )

  * different processes, different environments  =>  service (web service, rpc )

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CIS 764 Database Systems Engineering

Web service is access of object methods for remote use (by client or other “components” via web protocols.

Why remote use ? (vs local ejb ?)

What kind application architecture?

Why web protocols? (vs rmi, rpc ?)

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CIS 764 Database Systems Engineering

one issue is efficiency:

              object  <<  component  <<  service 

Then why the focus, growth of web services?

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CIS 764 Database Systems Engineering

"Web Services Protocol Stack" , Wikipedia http://en.wikipedia.org/wiki/Web_Services_Protocol_Stack http://en.wikipedia.org/wiki/SOAP http://en.wikipedia.org/wiki/Web_Services_Description_Language http://en.wikipedia.org/wiki/Universal_Description_Discovery_and_Integration http://en.wikipedia.org/wiki/Business_Process_Execution_Language

Service/transport layer …. Http, …Message encoding layer … XML: SOAP , RPC

Description protocol ……. XML: WSDLDiscovery service ……….. XML base, business services directory

Business process model … BPEL

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CIS 764 Database Systems Engineering

http://www.w3schools.com/soap/soap_example.asp POST /InStock HTTP/1.1 Host: www.example.org Content-Type: application/soap+xml; charset=utf-8 Content-Length: nnn

<?xml version="1.0"?> <soap:Envelope xmlns:soap=http://www.w3.org/2001/12/soap-envelope soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> <soap:Body xmlns:m="http://www.example.org/stock">    <m:GetStockPrice> <m:StockName>IBM</m:StockName>     </m:GetStockPrice> </soap:Body> </soap:Envelope>

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CIS 764 Database Systems Engineering

Response:

HTTP/1.1 200 OK Content-Type: application/soap+xml; charset=utf-8 Content-Length: nnn

<?xml version="1.0"?> <soap:Envelope xmlns:soap=http://www.w3.org/2001/12/soap-envelope soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> <soap:Body xmlns:m="http://www.example.org/stock"> <m:GetStockPriceResponse> <m:Price>34.5</m:Price> </m:GetStockPriceResponse> </soap:Body> </soap:Envelope>

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CIS 764 Database Systems Engineering

   Web Service Description Language:      partial example  http://www.w3schools.com/wsdl/wsdl_documents.asp      syntax pattern    http://www.w3schools.com/wsdl/wsdl_syntax.asp

Structure

Element Defines <portType> The operations performed by the web service <message> The messages used by the web service <types> The data types used by the web service <binding> The communication protocols used by the web service

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CIS 764 Database Systems Engineering

Partial example:

<message name="getTermRequest"> <part name="term" type="xs:string"/> </message>

<message name="getTermResponse"> <part name="value" type="xs:string"/> </message>

<portType name="glossaryTerms"> <operation name="getTerm"> <input message="getTermRequest"/> <output message="getTermResponse"/> </operation></portType>

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CIS 764 Database Systems Engineering

Universal Description, Discovery, and Integration service,       and XML registry, with three parts:                White Pages — address, contact, and known identifiers;      Yellow Pages — industrial categorizations w standard taxonomies;       Green Pages — technical info about services.

       e.g.  UDD4J  Java implementation  http://uddi4j.sourceforge.net/

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CIS 764 Database Systems Engineering

  Example Oracle WS tutorials:

Creating a Web Service from an EJB (reverse engineering)  http://www.cis.ksu.edu/~hankley/d764/Oracle/Labs/J2EE_Track/Lab2WebServices/WebServicesLab.htm

  Developing, Deploying, and Managing a Web Service Using JDeveloper  http://www.oracle.com/technology/obe/obe1013jdev/ws/wsandascontrol.htm

  calendar service,  direct access in OC4J,  (rev. engr --service from class)

  Developing a Web Service with JDeveloper (fwd engineering)  http://www.oracle.com/technology/obe/obe1013jdev/preview10131_wstopdown/wstopdown.htm

  credit rating service,  direct service in OC4J,  (component from contract)

   Securing Web Service using JDeveloper    http://www.oracle.com/technology/products/jdev/101/howtos/securews/index.html

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CIS 764 Database Systems Engineering

SOA - Service Oriented Architecture:http://en.wikipedia.org/wiki/Serviceoriented_architecture#SOA_and_Business_Architecture

building of enterprise application based on web servicesand supporting components.

Is it different than web-applications architecture (J2EE web apps) ?

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CIS 764 Database Systems Engineering

SOA - Service Oriented Architecture:http://en.wikipedia.org/wiki/Serviceoriented_architecture#SOA_and_Business_Architecture

building of enterprise application based on web servicesand supporting components.

Is it different than web-applications architecture (J2EE web apps) ?

Ans: focus on business processes (vs single app / ops) focus on sharing services/ components

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CIS 764 Database Systems Engineering

major enterprise design aspect is on business process modeling (sometimes called “workflow” )

e.g. http://en.wikipedia.org/wiki/Business_Process_Modeling_Notation

Interaction Patterns  http://sky.fit.qut.edu.au/~dumas/ServiceInteractionPatterns/

Oracle SOA center:http://www.oracle.com/technology/tech/soa/index.html

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CIS 764 Database Systems Engineering

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CIS 764 Database Systems Engineering

distinction between “orchestration” … constraint behavior for one participantvs “choreography”… coordination between various parties

in a sense, UML sequence model is orchestration (a behavior model) UML swim lane process model is choreography (a process coordination model)

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CIS 764 Database Systems Engineering

BPEL .. an executable control language http://en.wikipedia.org/wiki/BPEL

Other slides:http://www.bptrends.com/publicationfiles/BPEL4ProgArchies.pdf

Discussion:http://elementallinks.typepad.com/bmichelson/2005/09/view_bpel_proce.html

Patterns:http://is.tm.tue.nl/research/patterns/download/Oracle_BPEL_v.10.1.2.pdf

BPELJ …Java implemenationhttp://ftpna2.bea.com/pub/downloads/ws-bpelj.pdf …. More examples / discussion

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CIS 764 Database Systems Engineering

Oracle BPEL Process  Manager http://download-west.oracle.com/docs/cd/B14099_19/integrate.1012/b14448/introbpel.htm BPEL tutorial:Model and Deploy the Loan Flow Process using Oracle BPEL Process Manager

http://www.oracle.com/technology/obe/obe_as_1012/integration/bpel/bpel_jdev/bpel_jdev.htm

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