Windows Communication Foundation (WCF).ppt

* * * * Windows Communication Foundation (WCF) Jim Fawcett CSE775 – Distributed Objects Spring 2007 References Introducing WCF, David Chappell, /IntroducingWCFv1.2.1.pdf Using three diagrams from this reference Programming Indigo, David Pallmann, Microsoft Press, 2005 Pro WCF, Peiris and Mulder, Apress, 2007 What is WCF? Integration of several Microsoft Technologies: Web services (ASMX) Web service extensions (WSE) WS-Security WS-Reliability WS-Addressing .Net Remoting MSMQ messaging COM+ Transactions Chappell, ibid, pg 14 Channel Model WCF supports three types of channel activity: Asysnchronous one-way Request, wait for reply Full duplex two-way Channel Shapes IOutputChannel IInputChannel IRequestChannel IReplyChannel IDuplexChannel IDuplexChannel Endpoints and Channels ServiceHost host  = new ServiceHost(typeof(MyService)); Uri address = new Uri(“net.tcp://kennyw2/Service/endpoint”); Binding binding = new NetTcpBinding(); Type contract = typeof(IMyContract); host.AddEndpoint(address, binding, contract); host.Open(); Structure Service Contract Service contract – RPC Interface Data contract – Type serialization Message contract – Soap message Binding Transport – HTTP, TCP, MSMQ, … Channel type – one-way, duplex, request-reply Encoding – XML, binary, MTOM (msg trans optim mech) WS-* protocols – WS-Security, … Address http://someURI net.tcp://someOtherURI net.msmq://stillAnotherURI Chappell, ibid, pg 25 Channel Interfaces public interface IOutputChannel : IChannel{ void Send(Message msg); } public interface IInputChannel : IChannel{ Message Receive(); } public interface IDuplexChannel : IOutputChannel, IInputChannel {} public interface IRequestChannel : IChannel{ Message Request(Message msg); } public interface IReplyChannel : IChannel{ IRequestContext ReceiveRequest(); } public interface IRequestContext : Idisposable{ Message RequestMessage { get; }  void Reply(Message msg); } Service Contract %@ ServiceHost Language=“C#” Service=“MyService”