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ServicesusingWCF

MartinKroppUniversityofAppliedSciencesNorthwesternSwitzerland

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LearningTargets You

knowthedesigngoalsofWindowsCommunicationFoundation

canexplainthearchitectureofWCF canexplaintheABCofWindowsCommunicationFoundation

candevelopservicesusingWCF

canuseservicesthroughdifferentcommunicationchannels

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Content

WCFBasics MainConcepts

Addresses

Contracts

Behaviour

Practice

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WCFFundamentals WindowsCommunicationFoundations

Isaruntimeformessagebasedcommunication

DevelopmentAPI

Forcreatingsystemsthatsendmessagesbetweenservicesandclients

UnifiedAPIacrossdifferenttransportmechanisms

Forapplicationsthatcommunicatewithother

applications Onthesamecomputersystem

Onexternalcomputersystem Inanothercompanyaccessibleovertheinternet

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TheFourTenetsofService-Orientation

Servicesandconsumersareindependentlyversioned,deployed,operated,andAutonomousEvolution

Developersopt-intoconsuming,exposing,

anddefiningpublic-facingservicefaade.

Boundaries

areExplicit

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secured.

Dataneverincludesbehavior;Objectswithdataandbehaviorarealocalphenomenon.

Shareschema&contract,notclass

Capabilitiesandrequirementsrepresentedbyauniquepublicname;Usedtoestablishservicesuitability.

Compatibilitybasedonpolicy

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Aunifiedprogrammingmodelforbuildingservice-orientedapplicationsontheWindowsplatform

Unifiestodaysdistributedtechnologystacks

Composablefunctionality

Appropriateforuseon-machine,intheintranet,andcrosstheInternet

WCFDesignGoals

Unification

WS-*interoperabilitywithapplicationsrunningonotherplatforms

Interoperabilitywithtodaysdistributedstacks

Interoperability&Integration

Service-orientedprogrammingmodel

Supports4tenetsofservice-orientation

Improvedeveloperproductivity

ProductiveService-Oriented

Programming

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Caller Service

CallersandServices

Messa es

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Caller Service

Endpoints

EndpointEndpoint

Endpoint

n po n

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Service

CBA

Caller

TheABCofWCF

ABC

CBA

Address

Where?

Contract

What?

Binding

How?

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WCFArchitecture:MessagingRuntime

Contract

and

Behaviors

ClientService

Dispatcher

Transport

Encoder

Protocol(s)

Transport

Encoder

Protocol(s)

Binding

Address

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Adresses Defineswhere aserviceislocated

SpecifiesaURIwheretheserviceislocated Relativeorabsolute

Addressconsistof Scheme

HTTP,TCP,Namedpipes,MSMQ

[Port] Path

Examples http://www.mystore.com/StoreFront

net.tcp://mycomputer:9000/StoreFront

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Contracts Defineswhat aservicecommunicate

ServiceContracts

Describetheoperationsaservicecanperform

MapCLRtypestoWSDL

DataContracts

Describesadatastructure

MapsCLRtypestoXSD

MessageContracts

Definesthe(applicationspecific)structureofthemessageonthewire

MapsCLRtypestoSOAPmessages

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WaystoTalkOneWay

Request-Reply

Duplex(Dual)

Client Service

OneWay: Datagram-styledelivery

Request-Reply ImmediateReplyonsamelogicalthread

Duplex Replylaterandonbackchannel(callback-style)

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ServiceContract

[[[[ServiceContractServiceContractServiceContractServiceContract]]]]

public interface ICalculator{

[[[[OperationContractOperationContractOperationContractOperationContract]]]]

int DoMath int a int b strin o

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// Not exposed as part of the external contract :-)

void MethodRequiredForImplementation(bool b);

}

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DataContract

[[[[DataContractDataContractDataContractDataContract]]]]

public class ComplexNumber

{[[[[DataMemberDataMemberDataMemberDataMember]]]]public double Real = 0.0D;

[[[[DataMemberDataMemberDataMemberDataMember]]]]public double Imaginary = 0.0D;

public ComplexNumber(double r, double i){

this.Real = r;this.Imaginary = i;

}

}

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MessageContract

[[[[MessageContractMessageContractMessageContractMessageContract]]]]

public class ComplexProblem

{[[[[MessageHeaderMessageHeaderMessageHeaderMessageHeader(Name="Op",(Name="Op",(Name="Op",(Name="Op", MustUnderstandMustUnderstandMustUnderstandMustUnderstand=true)]=true)]=true)]=true)]public string operation;

[[[[MessageBodyMemberMessageBodyMemberMessageBodyMemberMessageBodyMember]]]]pu c Comp exNum er n1;

[[[[MessageBodyMemberMessageBodyMemberMessageBodyMemberMessageBodyMember]]]]public ComplexNumber n2;

[[[[MessageBodyMemberMessageBodyMemberMessageBodyMemberMessageBodyMember]]]]public ComplexNumber solution;

// Constructors

}

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Binding Describeshow aservicecommunicates

Specifiessetofbindingelements

Transport;http,tcp,np,msmq Encodingformat;text,binary,MTOM,...

Securityrequirements

Transactionrequirements

Setofpredefinedstandardbindings Canbecustomized

Custombinding

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Behavior Modifiesorextendsserviceorclientruntime

behavior

Examples Instancing;Singleton,PrivateSession,SharedSession,

PerCall

Concurrency;Multiple,Reentrant,Single Throttling;connections,threading

Metadatacustomization

Transactions;AutoEnlist,Isolation,AutoComplete

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Bindings&Behaviors:Security

Service

CBA

Client

ABC

CBA

BeBe

Bindings InsertClaims inMessages

BehaviorsImplement

Security Gates

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ConfiguringServices:DefiningEndpoints

" "=

bindingSectionName="basicProfileBinding"contractType="ICalculator" />

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ConfiguringWCF:SpecifyBindings

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FeaturesSummary

Address Binding BehaviorContract

HTTPTransport

WS-SecurityProtocol

WS-RM

http://...

Throttling

Behavior

InstancingBehavior

ConcurrencyBehavior

Request/Response

net.p2p://...Peer

Transport

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Transport

NamedPipeTransport

MSMQ

Transport

CustomTransport

Protocol

WS-CoordProtocol

Duplex

Channel

CustomProtocol

net.tcp://...

net.pipe://...

net.msmq://...

xxx://...

MetadataBehavior

ErrorBehavior

CustomBehavior

TransactionBehavior

SecurityBehavior

One-Way

Duplex

Externallyvisible,per-endpoint Opaque,per-service,endpoint,oroperation

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BuildingaWCFapplication

ApplicationDesign

Service

1. DefineContracts

2. ImplementContracts

3. DefineEndpoints

4. Host&RunService Client

1. GenerateProxyfromMetadata

2. Implement&RunClient

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