Get documents about "Implementing Soap Web Services
Document Sample
CERN
IDS
CERN – European Organization for Nuclear Research
Administrative Support - Internet Development Services
Implementing Soap & Web Services
By Jozef Drans eld (ST-MA)
&
Derek Mathieson (AS-IDS)
Presentation Roadmap
Past
Present
Future
CERN
IDS
Why Web Services?
“The Web can grow significantly in power and scope
if it is extended to support communication between
applications, from one program to another.”
- From the W3C XML Protocol Working Group Charter
CERN
IDS
The Hype
New paradigm?
Reason to move platforms?
Replacement for EDI?
CERN
IDS
Gartner’s ‘Hype’ Curve
Key: Time to “plateau”
Visibility
Less than two years
Biometrics Grid Computing
Two to five years
Five to 10 years
Natural-language
search Web Services Beyond 10 years
Identity services
Virtual
Personal digital
Wireless private
Nanocomputing assistant phones Text-to- LANs/802.11 networks
speech
E-tags
Speech recognition in
Peer-to-peer call centers
Voice over IP
Personal computing
fuel cells Bluetooth
WAP/ Public key infrastructure
Wireless
Web Location
Speech recognition on desktops
sensing
Peak of
Technology inflated Trough of Slope of Plateau of
trigger expectations disillusionment enlightenment productivity
Maturity
CERN Source: Gartner Group June 2002
IDS
What are Web Services?
Identified by a URI
Interfaces defined using XML
Can be discovered by other systems
Interact using XML based messages
conveyed by Internet protocols
Source: Web Services Glossary
CERN
IDS
What are Web Services?
Application 1 Application 2
XML
CERN
IDS
Is this New?
CERN
IDS
A Brief History …
CERN
IDS
Is this Different?
Platform neutral
Open Standards
– Interoperable
Based on ubiquitous software
– XML Parsers
– HTTP Server
CERN
IDS
The Components
CERN
IDS
Transport
HTTP POST is most common
But other protocols such as
– FTP
– SMTP
– HTTP GET
And other exotic ones:
– Jabber
– BEEP
CERN
IDS
Packaging – Soap
Used to mean
– Simple
– Object
– Access
– Protocol
From SOAP 1.2 > SOAP is no longer an
acronym
Two Types of SOAP
CERN
IDS
Packaging – Soap
SOAP RPC:
– encode and bind data structures into xml.
– encode an RPC call
CERN
IDS
Serialization
<PurchaseOrder>
<item type=“xsd:string”>
class PurchaseOrder { Serializer socks
String item = “socks”; </item>
int amount = 1; <amount type=“xsd:int”>
} 1
</amount>
</PurchaseOrder>
CERN
IDS
Packaging - SOAP
SOAP ‘document style’
– packages xml in an envelope
CERN
IDS
Packaging – Soap
HTTP Post
SOAP Envelope
SOAP Head
SOAP Body
CERN
IDS
Packaging – Soap
<s:Envelope xmlns:s=“URN”>
<s:header>
<s:transaction xmlns:m=“soap-
transaction”>
<m:transactionID>
1234
</m:transactionID >
</s:transaction>
</s:header>
CERN
IDS
Packaging – Soap
<s:Body>
<n:purchaseOrder xmlns:n=“URN”>
<n:item>socks</n:item>
<n:amount>1</n:amount>
</n:purchaseOrder>
</s:Body>
</s:Envelope>
CERN
IDS
Description – WSDL
Web Services Description Language
“Web Services Description Language
(WSDL) provides a model and an
XML format for describing Web
services.” w3c.org
CERN
IDS
Description – WSDL
Types
Messages
Operations
Encoding
Endpoint
CERN
IDS
Types
<types>
<schema targetNamespace=" IMessageService.xsd"
xmlns="…/XMLSchema"
xmlns:SOAPENC="…/soap/encoding/"/>
</types>
CERN
IDS
Messages
<message name=“purchase">
<part name=“item" type="xsd:string"/>
<part name=“quantity" type="xsd:integer"/>
</message>
CERN
IDS
Operations
<operation name="setMessage">
<input name="setMessageRequest“
message="tns:setMessageRequest"/>
<output name="setMessageResponse“
message="tns:setMessageResponse"/>
</operation>
CERN
IDS
Encoding
<soap:operation soapAction="" style="rpc"/>
<input name="setMessage0Request">
<soap:body use="encoded"
namespace="MessageService"
encodingStyle="…/soap/encoding/"/>
</input>
CERN
IDS
Endpoint
<service name="MessageService">
<port name="MessageServicePort"
binding="tns:MessageServiceBinding">
<soap:address location="http://localhost:8080/setMessage/"/>
</port>
</service>
CERN
IDS
Discovery – UDDI
Universal Description, Discovery and
Integration
A UDDI Server acts as a registry for
Web Services and makes them
searchable.
CERN
IDS
Discovery – UDDI
Demonstration:
https://uddi.ibm.com/ubr/registry.html
CERN
IDS
Discovery – UDDI
UDDI Registry
Inquiry
Publish
CERN
IDS
Discovery – UDDI
UDDI Registry
Inquiry
Publish
CERN
IDS
Examples
Java
– Client
– Server
VBScript
– Client –high level API
– Client – low level API
.NET
– C# Client
– C# Server
CERN
IDS
Design Recommendations
Create a local class
Create a method with the same name
CERN
IDS
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);
CERN
IDS
Examples (Java Client)
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, "");
CERN
IDS
Examples (Java Client)
Demonstration
CERN
IDS
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
CERN
IDS
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
CERN
IDS
Examples (VB Client)
Serializer.Init Connector.InputStream
Serializer.startEnvelope , ENC
Serializer.SoapNamespace "xsi", XSI
Serializer.SoapNamespace "SOAP-ENC", ENC
Serializer.SoapNamespace "xsd", XSD
Serializer.startBody
Serializer.startElement Method, URI, ,
"method"
Serializer.startElement “parameter“
Serializer.SoapAttribute "type", ,
"xsd:string", "xsi"
Serializer.writeString username
Serializer.endElement
Serializer.endBody
Serializer.endEnvelope
Connector.EndMessage
CERN
IDS
Examples (VB Client)
Name Bill
Colour blue
Call Web Service
CERN
IDS
Examples (C# Client)
Add a Web References to a project
Localhost.MessageService serv = new
Localhost.MessageService();
serv.setMessage(x, y);
CERN
IDS
Examples (C# Client)
Demonstration
CERN
IDS
Examples (C# Server)
public class Demo :
System.Web.Services.WebService {
public Demo() {
InitializeComponent();
}
[Web Method]
public string HelloWorld() {
return “Hello World”;
}
}
CERN
IDS
Web Services
Future
CERN
IDS
Security
Bookstore
Client
Application
CERN
IDS
Security
Bank
Client Bookstore
Application
Warehouse
CERN
IDS
WS 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
CERN
– XKMS - XML Key Management Specification
IDS
Security – Fire Walls
Bookstore
Client
Application
Fire Wall
CERN
IDS
WS-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
CERN
IDS
Missing Pieces
Security
– Single Sign-on, credentials
Transactions
Quality of service
– Timeliness guarantees
Asynchronous operations
– Co-ordination, workflow
CERN
IDS
Real Examples
Amazon Web Services API
Google Web API
HP & IBM online stores
CERN
IDS
Next Steps
Overtime Interface
Other documents (Materials Request,
TID, Transport Request)
E-Business – with ebXML
CERN
IDS
Gartner’s ‘Hype’ Curve
Key: Time to “plateau”
Visibility
Less than two years
Two to five years
Five to 10 years
Beyond 10 years
Web Services
Peak of
Technology inflated Trough of Slope of Plateau of
trigger expectations disillusionment enlightenment productivity
Maturity
CERN Source: Gartner Group June 2002
IDS
Thank you
Presentation and source code of
demos:
http://ais.cern.ch/presentations
CERN
IDS
