wcf introduction

WCF IntroductionARCOM - KSA

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2 Agenda What is WCF From object to service SOA , ESB ASMX & WCF WCF architecture Ways of talk [Client – Service] Service Provider , Consumer ABC’s of WCF Hosting WCF Advantage , Disadvantages Demos

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3 What is WCF?

Stands for Windows Communication Foundation Microsoft’s unified programming model (the service model) for building

Service-Oriented [SOA] apps

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4 From Objects to Services

PolymorphismEncapsulationSubclassing

Message-basedSchema+ContractBinding via Policy

1980s

2000s

Interface-basedDynamic LoadingRuntime Metadata1990s

Object-Oriented

Service-Oriented

Component-Based

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5 What’s SOA - ESB

software architecture model used for designing and implementing the

interaction between mutually interacting software applications in  (SOA)

software design and software architecture design pattern  discrete pieces of software application functionality as services A service is a self-contained unit of functionality

SOA (service oriented architecture)

ESB (Enterprise Service Bus)

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ASMX is limiting WCF is powerful

ASMX & WCF

Xml web services HTTP-only hosting in IIS  No support for security Advanced scenarios require mixing

models

highly configurable and highly extensible

 supports what ASMX cannot supports a unified programming

model across all protocols

Channel ModelFormats

(Atom, JSON, XML,…)

Transports(HTTP, TCP, …)

Protocols(SOAP, HTTP, Open Data Protocol,…)

Service ModelData Contract Service

ContractService Behavior

Programming ModelSOAP

ServicesWeb HTTP

ServicesData

ServicesRIA

ServicesWorkflo

w Services

WCF Architecture

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Ways to TalkOne Way

Request-Reply

Duplex (Dual)

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Client Service

One Way: Datagram-style delivery

Request-Reply : Immediate Reply on same logical thread

Duplex Reply : “later” and on backchannel (callback-style)q

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9 Service Provider , Consumer

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A B C

ABC’s of Life Service

ServiceClient

Address, Binding, Contract [WCF]

Address

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Endpoints

ABC

Endpoints

A B C

A B CMessage

Address Where the service isBinding How to talk to the service Contract What the service can do

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12 ABC’s Cont. [Address] Combination of transport, server name, port & path Transport is determined by the binding Examples

http://localhost:8001net.tcp://localhost:8002/MyServicenet.pipe://localhost/MyPipenet.msmq://localhost/private/MyServicenet.msmq://localhost/MyService

A

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13 ABC’s Cont. [Bindings] Transport

HTTPTCPMSMQ

Message formats and encoding Plain textBinary Message Transmission Optimization Mechanism (MTOM)

Communication securityNo security Transport security Message security

B

ABC’s Cont. [Contracts]Service Contrac

tDefines

Operations, Behaviors and Communicatio

n Shape

What does your service

do

Data Contrac

tDefines Data entities and parameter

types

What object data is used

Message

Contract

Allows defining application-

specific headers and unwrapped

body content

Allows control over the SOAP

structure of messages

Fault Contrac

t

Defines error types

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14C

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IIS / Azure (ASP.NET project) Windows Services

Hosting WCF Services

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16 Demos Hello WCF Edit WCF Configuration

Add services Add end points Binding configuration

Consume WCF Service Reference Using Code First

WCF Using UML [Class Diagram] WCF Architecture Code

Service Service.Contracts Service.Business

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17Advantage

You can create new components for security, transport, authentication.

No much change in code for implementing the security model ,, Small changes in the configuration will make your requirements.

Its faster than ASMX

Its Interoperability, for java, and more.

WCF is interoperable with other services

WCF services provide better reliability and security.

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18 Disadvantage WCF is Microsoft's implementation of SOA its APIs are solely controlled by MS

which makes interoperability a bit difficult.

deploy WCF apps, need more underlying hardware

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Thank You ..|