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Wednesday, March 26, 2008

Calling services from services

I was looking for guidance on this topic, and came up with nothing. I'm sure people are doing this, but can't find any info. For anyone looking like I was, here's how to do it.

It's much simpler than I imagined, thanks to WCF. You can programmatically create your endpoint, binding, and channel inside your service. This would require that the address be hard-coded and require a recompile to change the address or binding. As long as your host's app.config or web.config has a client endpoint specifying the contract, you don't have to go through all that work. Your service is simply a client of another service, so your code looks just like that of a client of your service. Furthermore, changing the address or binding is as simple as changing config file values.

Service code:

    1 using System;
    2 using System.ServiceModel;
    3 using DataContracts;
    4 namespace ServiceImplementation
    5 {
    6     [ServiceContract]
    7     public interface IEmailService
    8     {
    9         [OperationContract]
   10         void Send(DataContracts.MailMessage msg);
   11     }
   12 
   13     public class EmailService : IEmailService
   14     {
   15         [OperationBehavior]
   16         public void Send(DataContracts.MailMessage msg)
   17         {
   18             // Open client proxy for legacy web service
   19             using (LegacyEmailServiceClient proxy =
   20                 new LegacyEmailServiceClient())
   21             {
   22                 proxy.SendEmail(msg.To, 
   23                     msg.CC, 
   24                     msg.Bcc, 
   25                     msg.Body, 
   26                     msg.Attachments);
   27             }
   28         }
   29     }
   30 }
   31 

Host's app.config:

    1 <?xml version="1.0" encoding="utf-8"?>
    2 <configuration>
    3   <system.serviceModel>
    4     <bindings>
    5       <basicHttpBinding>
    6         <binding name="BasicHttpBinding_Common">
    7           <security mode="None"/>
    8         </binding>
    9       </basicHttpBinding>
   10       <netTcpBinding>
   11         <binding name="NetTcpBinding_Common">
   12           <security mode="None"/>
   13         </binding>
   14       </netTcpBinding>
   15     </bindings>
   16     <client>
   17       <endpoint address="http://www.gotjeep.net/legacy/email.asmx"
   18           binding="basicHttpBinding"
   19                 bindingConfiguration="BasicHttpBinding_Common"
   20           contract="LegacyEmailServiceClient"
   21                 name="LegacyEmailServiceClient" />
   22     </client>
   23     <services>
   24       <service name="ServiceImplementation.EmailService"
   25               behaviorConfiguration="returnFaults">
   26         <host>
   27           <baseAddresses>
   28             <add baseAddress="http://localhost:8080/EmailService" />
   29             <add baseAddress="net.tcp://localhost:8088/EmailService" />
   30           </baseAddresses>
   31         </host>
   32         <endpoint name="NetTcpBinding_EmailService"
   33                   binding="netTcpBinding"
   34                   bindingConfiguration="NetTcpBinding_Common"
   35                   contract="ServiceImplementation.IEmailService"/>
   36         <endpoint name="BasicHttpBinding_EmailService"
   37                   binding="basicHttpBinding"
   38                   bindingConfiguration="BasicHttpBinding_Common"
   39                   contract="ServiceImplementation.IEmailService"/>
   40       </service>
   41     </services>
   42     <behaviors>
   43       <serviceBehaviors>
   44         <behavior name="returnFaults" >
   45           <serviceMetadata httpGetEnabled="true" />
   46         </behavior>
   47       </serviceBehaviors>
   48     </behaviors>
   49   </system.serviceModel>
   50 </configuration>

Wednesday, March 26, 2008 9:08:46 PM (Eastern Standard Time, UTC-05:00)

Comments [3] .NET Framework | C# | WCF |