Soa wcf 1.1

Who I am

I am Sharada Prasad, having 17+ years of exp. in science and technology.

My exp. Includes Tech. training/Product development/Tech. analysis/consulting in
IT/CS/Physics/IPR.

M.Sc Physics(Elex); M.Tech(CS); Dip (IPR)
Sbermola@hotmil.com
Mobile:9810201453
70-C, Mig, Sect-100, Noida.

Sharad Prasad IT/IPR
Consultant

What I will cover

• SOA introduction
• What is WCF? - Intro. to WCF as SOA platform
• Why WCF?- Some reasons for using WCF
• How WCF?- Demo for creating, hosting, and calling WCF services

Consultant

SOA introduction
• SOA is an evolved programming model for business.
• Evolution of programming
– In 60’s:
• hll such as COBOL, FORTRAN evolved; Compilers were common tools for programming; JUMP, GOTO kind of
statement were common;
• Ripple effect in code - as code was highly coupled and least cohesive therefore further evolution was needed.
– In 70’s:
• Structured programming; C, PaSCaL; code reuse through functions; but functions were tied to data
• Still code was coupled and not much cohesive – needed further evolution
– In 80’s:
• Object orientation; C++, smalltalk, ada; abstraction/inheritance; code was less coupled and more cohesive
– In 90’s:
• Component based; lib;dll; COM/CORBA; code was less coupled and highly cohesive;
• Interoperability was complex
– In 2000’:
• Service orientation; Web services; XML/SOAP
• Most of the known issues { ripple effect, coupling, cohesion, integration} are solved in SOA.
– Highly cohesive and least coupled code, which is easily interoperable and discoverable

• So, SOA is a business facilitator

Consultant

SOA as a business facilitator, how?

• Loosely coupled code {services}
• Contracts {adherence to SLA }
• Autonomy {control of BL services encapsulates}
• Abstraction { hide BL from service consumers}
• Reusability { divide BL into reusable services}
• Statelessness {min. retention of info. Specific to an activity }
• Discoverability { self-describes so that they can be found
and assessed}

Consultant

SOA meets the computing challenges?
• Compute - Processing {IaaS, PaaS, SaaS}

• Storage - Memory {IaaS, PaaS, SaaS}

• Networking -Communication {IaaS, PaaS, SaaS}

• Energy - Power {IaaS, PaaS, SaaS}

• Environment - Pollution {IaaS, PaaS, SaaS}

• Material - Business {IaaS, PaaS, SaaS}

• Humanity - Social {IaaS, PaaS, SaaS}

Consultant

Some of the SOA platforms

• MS Share Point/BizTalk server
• Smart SOA & WebSphere
• SAP NetWeaver Process Intrergration
• Oracle Enterprise Service Bus
• TIBCO Active Matrix BusinessWorks
• Unify NXJ
• ServiceMix
• .
• .
• .

Consultant

What is WCF?
• MS framework for building SOApplication
– For building distributed and interoperable apps.
• Unifies ASMX, .NET Remoting, and Enterprise services stacks
– In a single prog. Model.
– Configurable protocol choices, messaging formats, and process allocation, etc.
• Service-oriented
– Built for service-oriented system design
– Simplifies how you approach SOA
• Loosly coupled
– Every thing is configurable
– Not bound to a particular protocol, encoding, or hosting environ
• Interoperable
– Supports core web services standards
– Extensible to Quickly adapt to new protocols and updates
• Integration
– Integrates with earlier MS stacks
• Com, services, msmq

Consultant

Why to use WCF?
• Because,
• Services are the core of the SOA and WCF is the easiest way to produce and
consume services on MS platform.

• By leveraging WCF, developer can focus on their application rather than on
communication protocol

• It is a classic case of tech. encapsulation and tooling

• Developers are more productive if their tools encapsulates (but not hide) tech. jobs
wherever possible, and WCF combined with VS does the same

Consultant

How to use WCF?
• Code Walkthrough
– {
• Let say you have your legacy code (BL)- BLTDSCalc as a dll
• Wrap the existing BL (BLTDSCalc.dll) in a SOA service (class)
• Add some more business logic the SOA class let say -
BLGenerateTDSCertificate
• Define service contracts for both Methods
• Host the service
– Contract, behavior, binding, addressing, channels, messaging,
formatting, security all in code
– Above things can be divided in code (c#) and configuration (xml)
in separate files
• Use the services
– Discovery to get the contract and configuration using ASR
» Metadata exchange should be enabled
– Use svcutil.exe to discover the services.
– }
Consultant

Code
//this is our old business logic - a class dll

namespace TDSCalc
{
public class CTDSCalc
{
//Our old business logic to calculate TDS
public double MTDSCalc(double income)
{
//10% of the income is deducted as TDS
return income * 10 / 100;
}
}
}

Consultant

// we want to move to cloud and adapt to public class TDSService : ITDSService
SOA we will use our legacy logic {
// (TDSCalc) and add more services CTDSCalc objTDS = new CTDSCalc();
// and will use MS Platform for every thing public double GetTDS(double income)
{
//using our existing serives
using TDSCalc; return objTDS.MTDSCalc(income);
using System.ServiceModel; }
namespace SOAClasss }
{ public class TDSCertService :
[ServiceContract] ITDSCertService
public interface ITDSService {
{ public string GetCertificate(string
[OperationContract] name)
double GetTDS(double income); { //using our existing serives
} return "this is the tds certicate oftt"
+ name + "tt for year";
[ServiceContract]
}
public interface ITDSCertService
}
{
}
[OperationContract]
string GetCertificate(string pr_name);
}

Consultant

// service host
using System.ServiceModel;
using System.ServiceModel.Description;
using System;

namespace Host
{
class Program
{
static void Main(string[] args)
{
ServiceHost tdsCalcHost = new ServiceHost(typeof(SOAClasss.TDSService), new
Uri("http://localhost/8080"));
ServiceHost certHost = new ServiceHost(typeof(SOAClasss.TDSCertService), new
Uri("http://localhost/8080/sd/sd"));
tdsCalcHost.AddServiceEndpoint(typeof(SOAClasss.ITDSService), new
BasicHttpBinding(), "mex");
certHost.AddServiceEndpoint(typeof(SOAClasss.ITDSCertService), new
BasicHttpBinding(), "mex");
ServiceMetadataBehavior behavior = new ServiceMetadataBehavior();
behavior.HttpGetEnabled = true;
tdsCalcHost.Description.Behaviors.Add(behavior);
certHost.Description.Behaviors.Add(behavior);
certHost.Open();
tdsCalcHost.Open();
Console.Write("service runningn press enter to endn");
Console.ReadLine(); }}}
Consultant

// service consumer
using System;
namespace ServiceConsumer
{
class Program
{
static void Main(string[] args)
{
// TDS and Cert are two service references
TDS.TDSServiceClient tdsproxy = new TDS.TDSServiceClient();
Console.WriteLine("Pl. enter the income");
Console.WriteLine("tds is: {0}",
tdsproxy.GetTDS(double.Parse(Console.ReadLine())));
Cert.TDSCertServiceClient certproxy = new Cert.TDSCertServiceClient();
Console.WriteLine("Pl. enter the emp. name for which cert. is needed");
Console.WriteLine( certproxy.GetCertificate(Console.ReadLine()));
Console.ReadLine();
}
}
}

Consultant

Thank you

• Questions

Consultant

Soa wcf 1.1

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