Web Service

Service Registry

Service Requestor

Service provider

Publish find

Bind

http://www.ibm.com/services/uddihttp://www.ibm.com/services/uddi/testregistryhttp://uddi.microsoft.comhttp://test.uddi.mirosoft.comhp – available soon

SOAP on HTTP

All the Service describe by UDDI

UDDI (xml schemas)UDDI- Universal Description, Discovery, and Integration

• Programmatic descriptions of businesses and the services supported

• Programmatic descriptions of web service specifications

• Programming model & schema

UDDI Business RegistryBusinesses register public information about themselves

White pages

Yellow pages

Green pages

Business name, Text description, Contact info, Known identifiers

Business categories (standard taxonomies)

Specify how to bind to a service provider. Technical info about service (how to invoke their services) – a point to WSDL

UDDI by examples

Two examples in UDDI registry http://uddi.microsoft.com

1. Flower (a regular service)

2. Xmethods (provides more than one web services, each one is described in a WSDL file)

WSDL- Web Service Description Language (an xml vocabulary that is used to define the service interface for a web service)

• Service interface detail• Access protocol • Contact endpoint (http://www.xmethods.net/detail.html?id=5 )

WSDL

Service Implementation Definition

Service

Port

Service Interface Definition

Binding

Message

PortType

Type

url to accept the soap request

WSDL ExamplesExamples from www.xmethods.net

Service Name: Joke of the DayDescription: Provides a random joke on each execution.WSDL URL:http://services.xmltoday.com/vx_engine/wsdl_publish.vep/joke.wsdl

Service Name: Sun/Moon rise and set data

Description: Sunrise, sunset, moonrise, moonset for a given latitude, longitude, date and time bias.WSDL URL:

http://www.armyaviator.com/cgi-bin/astro.exe/wsdl/IAstro

SOAPSimple Object Access Protocol (SOAP) is a lightweight protocol that defines a uniform way of passing XML-encoded data. (It also defines a way to perform remote procedure using HTTP as the underlying communication protocol)

soap messagehttp headers

soap Envelope

soap header

soap body

SOAPHeader• Use for authentication, transaction

management, payment, encryption etc.

Body• Special defines one body entry: Fault

<SOAP-ENV: Fault>

<faultcode>SOAP-ENV:server</faultcode>

<faultstring>Method’s getXXX is not supported.</ faultstring>

<faultactor>/xxx/xxx.jsp</ faultactor>/

</SOAP-ENV: Fault>

SOAP MessagePOST /WeatherServioce HTTP/1.1Host:www.weatherservice.comContent-Type: text/xml; charset=“utf-8”Content-Length: nnnnSOAPAction: “Some-URL”

<SOAP-ENV:Envelope xmlns:SOAP-ENV=“http://schemas.xmlsoap.org/soap/envelope/”SOAP-ENV:encodingStyle=“http://schemas.xmlsoap.org/soap/encoding/”>

<SOAP-ENV:Body> <m:GetWeather xmlns:m=‘Some-URL’> <city>Seattle</city> <state>WA</state> </m:GetWeather> </SOAP-ENV:Body></SOAP-ENV:Envelope>

Web Services Stack

Service Negotiation

internet

Transport

Messaging

Service Description

Workflow, Choreography

Routing & Attachments

Managem

ent

Quality of S

ervice (QoS

)

Security

Web Service

• Currently most service entry (>95%) in UDDI registry are not web based service.

• In the future there will be private vertical UDDI registries and only trust company can register the service.

• Real business will used private UDDI registry to find the service.

Web Service

Service Registry

Service Requestor

Service provider

1. Service provider Publish Service2. Service requestor

find the service

3. Use the service through a SOAP call (use WSDL to build the SOAP request)

SOAP on HTTP

J2EE vs. .NetTo develop web service:java:

Platform > JVM > servlet, jsp, jdbc, jndi, jms, rmi, corba, EJB, jax package etc.

.net Wintel > CLR (common Language Runtime) > System.WebService, ASP.NET, DirectoryServices, System.Messaging, System.Runtime.Remoting, MSXML, SOAP, WSDL etc.

Tools availableTools for Java & Web Service• SOAP4J (apache & IBM), JAX package (sun)

• GLUE (the mind electric)

• Sun: bowstreet (include Jbuilder) • IBM websphere (include Application developer IDE)

Utility tools • Tcp monitor/tunnel (Soap4J) (to monitor soap message)

• Struts(apache) (to generate web interface from WSDL file)

Sun ONE (Open Net Environment)

SOAP4J (apache)• Client library to invoke SOAP service

- API for invoking SOAP RPC service- API for sending and receiving SOAP messages.

• Used as a server – side tool to implement SOAP accessible services.- RPC accessible service- Message accessible service

JAX package – Java API for XML

• JAXP – parse XML documents• JAXB – map XML elements to java classes• JAXM – sends SOAP messages• JAXR –provides a standard way to access

business registry• JAX-RPC – sends SOAP calls to remote

parties• MultiSchema Validation – not in JAX package

IBM/Apache Struts

Input Form JSP

Struts Controller

Servlet

WSDL Parser Action

WSDL

Output Form JSP

Struts Controller

Servlet

SOAP call Action

SOAP

GLUEto create software building blocks that are language, platform and location independent.

Useful feature:• A toolkit for parsing and manipulating XML• XML/Java mapping system• XML storage system• SSL authentication• A browser-based management console

Glue - Demopublic class Exchange { public float getRate( String country1, String country2 ) { return 122.69F; // always return a constant for this demo } }

import electric.registry.Registry;import electric.server.http.HTTP;public class Publish1 { public static void main( String[] args ) throws Exception { // start a web server on port 8004, accept messages via /glue HTTP.startup( "http://localhost:8004/glue" ); // publish an instance of Exchange Registry.publish( "urn:exchange", new Exchange() ); } }>java Publish1GLUE 1.2 © 2001 The Mind ElectricStartup server on http://129.57.41.138:8004/glue

Glue - Demohttp://einstein.jlab.org:8004/glue/urn:exchange.wsdl

Glue - Demoimport electric.registry.Registry;import examples.publish.IExchange;

public class Invoke1{ public static void main( String[] args ) throws Exception { // bind to web service whose WSDL is at the specified URL String url = "http://localhost:8004/glue/urn:exchange.wsdl"; Exchange exchange = (Exchange) Registry.bind( url, Exchange.class ); // invoke the web service as if it was a local java object float rate = exchange.getRate( "usa", "japan" ); System.out.println( "usa/japan exchange rate = " + rate ); } }

> java Invoke1 usa/japan exchange rate = 122.69

Glue - Demohttp://einstein.jlab.org:8080/console/index.espWSDL = http://einstein.jlab.org:8004/glue/urn:exchange.wsdl

IBM WebSphere Studio• WebSphere Stuio Site Developer – a tool for

developing and managing web sites that include HTML, JSP pages, Java servlets, rich media, xml, and web services.

• WebSphere Stuio Application Developer – a J2EE-compliant server-side Java tool, focusing on EJB development, deployment, and profiling, that also contains all the functionally of Site Developer.

IBM Application Developer• EJB and servlet creation and deployment• Performance profiling and analysis tools• Database wizards• Web services wizards• JSP tags• Team environment• XML tools• Core Java IDE• Web page wizards with dynamic effects• Java development environment

Web service development• Discover – browse the UDDI registry to locate existing Web

services for integration

• Create or transform – create Web service from existing projects.

• Build – wrap existing artifacts as SOAP and HTTP service and describe them in WSDL.

• Deploy – deploy the Web service into Websphere Application server or Tomcat.

• Test – test the web service as it runs locally or remotely

• Develop – generate a sample application to assist you in creating your own Web service client application.

• Publish – publish Web service to the UDDI business registry.

XML tools• Create, view, and validate DTDs and XML schemas• Create XML documents from DTD• Generate JavaBeans from DTD or xml schema• Define mappings between XML documents and

generate XSLT scripts that transform documents.• XSL stylesheet processor (xalan)

Sun - bowstreetBowStreet - Business Web Portal Solution• Portal Configuration & Customization

- Create portals within minutes using wizards.

- Build in portal “factory”

• Application Integration- Packaged application- Content & document management- Application servers- Messaging systems- XML, EJB, SOAP etc.

SummaryJAX package - use it in grid project to send soap

message

Apache SOAP4J - slow, include server and client.

GLUE – use it to generate WSDL and web console.

Sun: bowstreet (include Jbuilder) - no experience

IBM Websphere - only got complimentary preview copy - contains too much (most are not needed)

Jbuilder – Good IDE for java development

JLab Grid Web ServiceService:• Convert the GridServer (application) to a bean-like

application.• Modify GridService (servlet) to take SOAP request

using jaxm package (or other).• Add WSDL to describe our service (use GLUE or

other package to generate it).

Client:• Add Soap layer for requesting the service.• Create service web interface (html) using GLUE or

Struts package.