introduction wcf definition wcf architecture implementation wcf demo overview
Post on 19-Dec-2015
273 Views
Preview:
TRANSCRIPT
IntroductionWCF DefinitionWCF ArchitectureImplementationWCF Demo
Overview
Introduction
Web Services Everywhere…
Web Services Components
Universal Description Discovery and Integration, example
Web Services Description Language
Define the structure of an XML document, just like a DTD
Simple Object Access Protocol
Client Invoking a Web Service
POST SimpleService.asmx/EchoString HTTP/1.1 Host: localhost:1489 User-Agent: Mozilla/5.0 Accept: text/html Content-Type: application/json; Content-Length: 27 ...
XML, JSON, SOAP, AtomPub ...
HTTP Communication
Headers
Data
Verb URL
POST SimpleService.asmx/EchoString HTTP/1.1 Host: localhost:1489 User-Agent: Mozilla/5.0 Accept: text/html,application/xhtml+xml Content-Type: application/json; Content-Length: 27 ...
{"Age":37,"FirstName":"Eyal",
"ID":"123", "LastName":"Vardi“ }
Headers
Data
Verb URL
<Envelope> <Header> <!–- Headers --> <!-- Protocol's & Polices --> </Header> <Body> <!– XML Data --> </Body> </Envelope>
JSON vs. SOAP
WCF Definition
Visual Studio 2008Visual Studio 2008
Clarifying Version Confusion…
.NET Framework 3.5.NET Framework 3.5
.NET Framework 3.0 + .NET Framework 3.0 + SP1SP1
.NET Framework 2.0 + .NET Framework 2.0 + SP1SP1
Windows Windows Presentation Presentation FoundationFoundation
Windows Windows Communication Communication
FoundationFoundation
Windows Windows Workflow Workflow
Foundation Foundation
Windows Windows CardSpaceCardSpace
• WCF designed to offer a manageable approach to:– Distributed computing.– Broad interoperability.– Direct support for service orientation.
Windows Communication Foundation (WCF)
A unified development model
WindowsCommunication
Foundation
Many confusing and complicated options
Remoting COMDCOM
COM+MSMQ
WSEASMX
A Unified Programming Model
WCF Architecture
Client ServiceWCF
dispatcherProxy
Message EncodingEncoding
Transportchannel
Transportchannel
ChannelChannelChannelChannel
ChannelChannel
Transportchannel
Transportchannel
EncodingEncodingBindingBinding
ChannelChannelChannelChannel
ChannelChannel EndpointsEndpoints
Listen for messages on one or more endpoints.
Proxy object used to send messages to the service.
Proxy hides communications complexity, and makes the remote service appears as local object.
Matching Binding
Sending a WCF Message
Service
.NET Classesand Interface
ServiceHost
Service Contracts or Metadata Exchange
mex enables communication without prior knowledge of the contract (metadata about the service).
IIS / Standalone Managed Application
Structure of a Service
Service
Where to find the service
Example: http://localhost:8001/MathService
Where to find the service
Example: http://localhost:8001/MathService
AddressAddress
How to communicate with the service
Example: BasicHttpBinding
How to communicate with the service
Example: BasicHttpBinding
BindingBinding
What the service can do for you
Example: [OperationContract]int Add(int num1, int num2);
What the service can do for you
Example: [OperationContract]int Add(int num1, int num2);
ContractContract
The ABC of Endpoints
Windows Forms application
Windows Console application
Windows service
WPF application
Hosting a WCF Service in a Self-Hosted Managed Application
Implementation
• Contracts for services, data, and messages– A contract is simply an interface declaration
• Service, Data, and Message definitions– Class implementations
• Configurations defined programmatically or declaratively– config files.
• A host process (can be self hosted)– IIS, Windows Executable, Windows Service, or WAS
• .Net Framework (3.5) Classes provide support for all of the above.
Essential Pieces of WCF
• IService.cs– Interface(s) that define a service, data, or message
contract• Service.cs
– Implement the service’s functionality• Service.svc
– Markup file (with one line) used for services hosted in IIS • Configuration files that declare service attributes,
endpoints, and policy– App.config (self hosted) contains service model markup– Web.config (hosted in IIS) has web server policy markup
plus service model markup, as in App.config
WCF Service Files
using System;using System.ServiceModel;
namespace ConnectedWCF{ [ServiceContract(Namespace="http://myuri.org/Simple") ] public interface IBank { [OperationContract] decimal GetBalance(string account);
[OperationContract] void Withdraw(string account, decimal amount);
[OperationContract] void Deposit(string account, decimal amount); }
using System;using System.ServiceModel;
namespace ConnectedWCF{ [ServiceContract(Namespace="http://myuri.org/Simple") ] public interface IBank { [OperationContract] decimal GetBalance(string account);
[OperationContract] void Withdraw(string account, decimal amount);
[OperationContract] void Deposit(string account, decimal amount); } Attributes control exposure of types and methods
Example of a Simple Contract
<system.serviceModel> <services> <service name="ConnectedWCF.BankService"> <endpoint address="BankService" binding="basicHttpBinding" contract="ConnectedWCF.IBank"/> <host> <baseAddresses> <baseAddress baseAddress="http://localhost:8080/Simple"/> </baseAddresses> </host> </service> </services></system.serviceModel>
<system.serviceModel> <services> <service name="ConnectedWCF.BankService"> <endpoint address="BankService" binding="basicHttpBinding" contract="ConnectedWCF.IBank"/> <host> <baseAddresses> <baseAddress baseAddress="http://localhost:8080/Simple"/> </baseAddresses> </host> </service> </services></system.serviceModel>
• Root element is system.serviceModel• WCF-specific elements below this have various properties and sub elements
Identifying WCF Entries in Configuration Files
ServiceClass
ServiceInterface
ServiceMetadata
Implements
RunningService
ServiceProxy
Implements
ServiceAssembly
ProxyArtifacts
GenerateGenerateGenerateGenerate
GenerateGenerate
ServiceModel Metadata Utility Tool (Svcutil.exe) generates metadataand artifacts
ServiceModel Metadata Utility Tool (Svcutil.exe) generates metadataand artifacts
http://msdn.microsoft.com/en-us/library/aa347733(v=VS.90).aspx
Contracts, Metadata, and Artifacts
WCF Service HostWCF Service Library
Contract
Implementation
Configuration
WCF solution
Host code
Separation of Concerns in a WCF Service
Best Practices
Best Practices
WCF Demo
WCF Standard Bindings
NameName TransporTransportt
EncodingEncoding InteroInteropp
BasicHttpBindingBasicHttpBinding HTTP/HTTPSHTTP/HTTPS TextText YesYes
NetTcpBindingNetTcpBinding TCPTCP BinaryBinary NoNo
NetPeerTcpBindingNetPeerTcpBinding P2PP2P BinaryBinary NoNo
NetNamedPipeBindingNetNamedPipeBinding IPCIPC BinaryBinary NoNo
WSHttpBindingWSHttpBinding HTTP/HTTPSHTTP/HTTPS Text, MTOMText, MTOM YesYes
WSFederationBindingWSFederationBinding HTTP/HTTPSHTTP/HTTPS Text, MTOMText, MTOM YesYes
WSDualHttpBindingWSDualHttpBinding HTTP/HTTPSHTTP/HTTPS Text, MTOMText, MTOM YesYes
NetMsmqBindingNetMsmqBinding MSMQMSMQ BinaryBinary NoNo
NetIntegrationBindingNetIntegrationBinding MSMQMSMQ BinaryBinary YesYes
top related