SOA AND WCFSERVICE ORIENTED ARCHITECTURE & WINDOWS COMMUNICATION FOUNDATION

Dev Raj Gautam

Saturday, 18th may, 2013

Asp.NET Community MeetUp

SOASERVICE ORIENTED ARCHITECTURE

SOA

SOA or Service oriented architecture is an architecture style for building business applications by means of

services. Application comprises collection of services which communicate through messages.

Widely used in various programming platforms e.g. Net , Java etc.

Consists set of components which can be invoked, and whose interface descriptions can be published and

discovered (W3C).

Services are consumed by software service consumers (also known as clients or service requesters)

SERVICES IN SOA

A service is a self-contained unit of software that performs a specific task

Add a new customer, send an e-mail, register user etc.

It has three components:

Interface defines how a service provider will perform requests from a service consumer

Contract defines how the service provider and the service consumer should interact

implementation is the actual service code itself

MESSAGES IN SOA

Services communicate with each other using messages. Messages are standard formats which everyone (every

service) can read and understand.

Services communicate via standard Messages standard messages, which make them platform independent

WHY TO USE SOA? (IN SIMPLE TERMS)

Exposing services ensures clients get data without directly connecting to data source.

Process Reusability among different platforms

Different UI can access for same process and data source

Tackle heterogeneous technology stack

UNDERSTANDING THE REAL CONTEXT

HOW IS COMMUNICATION POSSIBLE AMONG HETEROGONOUS

PLATFORM? --SOAP

By using the World Wide Web's Hypertext Transfer Protocol (HTTP) and its Extensible Markup Language (XML)

as the mechanisms for information exchange

SOAP specifies exactly how to encode an HTTP header and an XML file so that a program in one computer can

call a program in another computer and pass it information. It also specifies how the called program can return a

response.

WCFWINDOWS COMMUNICATION FOUNDATION

WCF

The Windows Communication Foundation (or WCF), previously known as "Indigo", is a runtime and a set of APIs

(Application Programming Interface) in the .NET Framework for building connected service-oriented applications

(Wikipedia).

Using WCF, you can send data as asynchronous messages from one service endpoint to another

Multiple technologies at one place - WCF unites following four technologies.NET remoting

MSMQ

Web Services

COM+

.Net Remoting

Service Interface Service Implementation

UNDERSTANDING THE SERVICE STRUCTURE

SAMPLE REQUEST AND RESPONSE FROM WCF

Request

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">

<s:Header>

<Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://tempuri.org/IService1/GetData</Action>

</s:Header>

<s:Body>

<GetData xmlns="http://tempuri.org/">

<value>1</value>

</GetData>

</s:Body>

</s:Envelope>

Response

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">

<s:Header />

<s:Body>

<GetDataResponse xmlns="http://tempuri.org/">

<GetDataResult>You entered: 1</GetDataResult>

</GetDataResponse>

</s:Body>

</s:Envelope>

WCF END POINTS

ABC OF WCF ENDPOINTS

Address(Where?): Specifies the location of the service which will be like http://Myserver/MyService.Clients will

use this location to communicate with our service.

Binding-Address(How?): Specifies how the two parties will communicate in terms of transport and encoding

and protocols.

Contract(What?): Specifies the interface between client and the server. It's a simple interface with some

attribute.

FLEXIBILITY OF HOSTING OPTIONS IN WCF

Self-Hosting Your Service :A managed .NET application can host the wcf service itself,

Hosting in Windows Services

Hosting Using Internet Information Services

WSDL IN WCF (DOCUMENTING FOR CLIENTS)

WSDL documentation generation can be specified by [WSDLDocumentation (“”)] tag in service interface.

Service, operations and input/output parameter descriptions are added to WSDL

SAMPLE WSDL

<WSDL:message name="EchoStringSoapIn">

<WSDL:part name="parameters" element="tns:EchoString" />

</WSDL:message>

...

<WSDL:operation name="EchoString">

<WSDL:input message="tns:EchoStringSoapIn" />

<WSDL:output message="tns:EchoStringSoapOut" />

</WSDL:operation>

thank you