CERN IDS. CERN – European Organization for Nuclear Research Administrative Support - Internet...

CERNIDS

CERN – European Organization for Nuclear Research

Administrative Support - Internet Development Services

Implementing Soap & Web ServicesImplementing Soap & Web Services

By Jozef Dranseld (ST-MA) &

Derek Mathieson (AS-IDS)

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Presentation RoadmapPresentation Roadmap

Past

Future

Present

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Why Web Services?Why Web Services?

““The Web can grow significantly in power and scope The Web can grow significantly in power and scope if it is extended to support communication between if it is extended to support communication between applications, from one program to another.”applications, from one program to another.”

- From the W3C XML Protocol Working Group Charter

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The HypeThe Hype

New paradigm?Reason to move platforms?Replacement for EDI?

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Plateau ofproductivity

Slope of enlightenment

Trough of disillusionment

Peak of inflated

expectationsTechnology

trigger

Gartner’s ‘Hype’ CurveGartner’s ‘Hype’ CurveKey: Time to “plateau”

Less than two yearsTwo to five yearsFive to 10 yearsBeyond 10 years

Biometrics Grid Computing

Web Services

Nanocomputing

Personalfuel cells

Text-to-speech

WirelessLANs/802.11

Virtualprivatenetworks

Visibility

Maturity

Source: Gartner Group June 2002

Natural-language search

Identity services

Personal digitalassistant phones

E-tags

Speech recognition incall centers

Voice over IP

Bluetooth

Public key infrastructure

Speech recognition on desktopsLocationsensing

WAP/WirelessWeb

Peer-to-peercomputing

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What are Web Services?What are Web Services?

Identified by a URIInterfaces defined using XMLCan be discovered by other systemsInteract using XML based messages

conveyed by Internet protocols

Source: Web Services Glossary

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What are Web Services?What are Web Services?

XML

Application 2Application 1

Is this New?Is this New?

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A Brief History …A Brief History …

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Is this Different?Is this Different?

Platform neutralOpen Standards

– InteroperableBased on ubiquitous software

– XML Parsers– HTTP Server

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The ComponentsThe Components

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TransportTransport

HTTP POST is most commonBut other protocols such as

– FTP– SMTP– HTTP GET

And other exotic ones:– Jabber– BEEP

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Packaging – SoapPackaging – Soap

Used to mean – Simple– Object– Access– Protocol

From SOAP 1.2 > SOAP is no longer an acronym

Two Types of SOAP

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SOAP RPC:– encode and bind data structures into xml.– encode an RPC call

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SerializationSerialization

class PurchaseOrder {

String item = “socks”;

int amount = 1;

}

<PurchaseOrder>

<item type=“xsd:string”>

socks

</item>

<amount type=“xsd:int”>

1

</amount>

</PurchaseOrder>

Serializer

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Packaging - SOAPPackaging - SOAP

SOAP ‘document style’– packages xml in an envelope

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HTTP Post

SOAP Envelope

SOAP Body

SOAP Head

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<s:Envelope xmlns:s=“URN”>

<s:header>

<s:transaction xmlns:m=“soap-transaction”>

<m:transactionID>

1234 </m:transactionID

>

</s:transaction>

</s:header>

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<s:Body>

<n:purchaseOrder xmlns:n=“URN”>

<n:item>socks</n:item>

<n:amount>1</n:amount>

</n:purchaseOrder>

</s:Body>

</s:Envelope>

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Description – WSDLDescription – WSDL

Web Services Description Language“Web Services Description Language

(WSDL) provides a model and an XML format for describing Web services.” w3c.org

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Description – WSDLDescription – WSDL

Messages

Types

Operations

Encoding

Endpoint

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TypesTypes

<types>

<schema targetNamespace=" IMessageService.xsd"

xmlns="…/XMLSchema" xmlns:SOAPENC="…/soap/encoding/"/>

</types>

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MessagesMessages

<message name=“purchase">

<part name=“item" type="xsd:string"/>

<part name=“quantity" type="xsd:integer"/>

</message>

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OperationsOperations

<operation name="setMessage">

<input name="setMessageRequest“ message="tns:setMessageRequest"/>

<output name="setMessageResponse“ message="tns:setMessageResponse"/>

</operation>

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EncodingEncoding

<soap:operation soapAction="" style="rpc"/>

<input name="setMessage0Request">

<soap:body use="encoded" namespace="MessageService" encodingStyle="…/soap/encoding/"/>

</input>

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EndpointEndpoint

<service name="MessageService">

<port name="MessageServicePort" binding="tns:MessageServiceBinding">

<soap:address location="http://localhost:8080/setMessage/"/>

</port>

</service>

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Discovery – UDDIDiscovery – UDDI

Universal Description, Discovery and Integration

A UDDI Server acts as a registry for Web Services and makes them searchable.

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Demonstration:

https://uddi.ibm.com/ubr/registry.html



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UDDI RegistryInquiry

Publish

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ExamplesExamples

Java– Client– Server

VBScript– Client –high level API– Client – low level API

.NET– C# Client– C# Server

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Design RecommendationsDesign Recommendations

Create a local classCreate a method with the same name

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Examples (Java Client)Examples (Java Client)

URL endpointURL = new URL(endpoint);

Call call = new Call();

call.setSOAPTransport(m_httpconn);

call.setTargetObjectURI("MessageService");

call.setMethodName("setMessage");

call.setEncodingStyleURI(Constants.NS_URI_SOAP_ENC);

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Vector params = new Vector();params.addElement(new Parameter("name", java.lang.String.class, name, null));

params.addElement(new Parameter("colour", java.lang.String.class, colour, null));

call.setParams(params);Response response = call.invoke(endpointURL, "");

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Demonstration

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Examples (Java Server)Examples (Java Server)

A Web service Server is simple:– New class with method

Then:– Register class with soap router– Or– Place the source code in a jws file

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Examples (VB Client)Examples (VB Client)

High Level API (After adding a Web Service Reference)

Dim serv As clsws_MessageService

Set serv = New clsws_MessageService

serv.wsm_setMessage txtName.Text, txtColor.Text

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Serializer.Init Connector.InputStreamSerializer.startEnvelope , ENC

Serializer.SoapNamespace "xsi", XSISerializer.SoapNamespace "SOAP-ENC", ENCSerializer.SoapNamespace "xsd", XSDSerializer.startBody

Serializer.startElement Method, URI, , "method"

Serializer.startElement “parameter“Serializer.SoapAttribute "type", ,

"xsd:string", "xsi"Serializer.writeString usernameSerializer.endElement

Serializer.endBodySerializer.endEnvelope

Connector.EndMessage

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Call Web Service

Name

Colour

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Examples (C# Client)Examples (C# Client)

Add a Web References to a project

Localhost.MessageService serv = new Localhost.MessageService();

serv.setMessage(x, y);

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Examples (C# Client)Examples (C# Client)

Demonstration

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Examples (C# Server)Examples (C# Server)

public class Demo : System.Web.Services.WebService {

public Demo() { InitializeComponent();

}

[Web Method]public string HelloWorld() {

return “Hello World”;}

}

Web ServicesWeb ServicesFutureFuture

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SecuritySecurity

Bookstore

Client Application

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SecuritySecurity

Client Application

Bookstore

Bank

Warehouse

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WS Security StandardisationWS Security Standardisation

W3C - http://www.w3c.org – XML Encryption– XML Digital Signatures

WS-I - http://www.ws-i.org– WS Security Profile

OASIS - http://www.oasis-open.org– WS-Security – SAML - Security Assertion Markup Language– XACML - Extensible Access Control Markup

Language– XKMS - XML Key Management Specification

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Fire WallFire Wall

Security – Fire WallsSecurity – Fire Walls

Bookstore

Client Application

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WS-IWS-I

Web Services Interoperability Organization

http://www.ws-i.org

R1017 A RECEIVER MUST NOT mandate the use of the xsi:type attribute in messages except as required in order to indicate a derived type

WS-I Basic Profile Version 1.0

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Missing PiecesMissing Pieces

Security– Single Sign-on, credentials

TransactionsQuality of service

– Timeliness guaranteesAsynchronous operations

– Co-ordination, workflow

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Real ExamplesReal Examples

Amazon Web Services APIGoogle Web APIHP & IBM online stores

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Next StepsNext Steps

Overtime InterfaceOther documents (Materials Request,

TID, Transport Request)E-Business – with ebXML

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Plateau ofproductivity

Slope of enlightenment

Trough of disillusionment

Peak of inflated

expectationsTechnology

trigger

Gartner’s ‘Hype’ CurveGartner’s ‘Hype’ CurveKey: Time to “plateau”

Less than two yearsTwo to five yearsFive to 10 yearsBeyond 10 years

Web Services

Visibility

Maturity

Source: Gartner Group June 2002

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Thank you Thank you

Presentation and source code of demos:

http://ais.cern.ch/presentations

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