HOWTO: Get a MarshalByRefObject's remote URL
Question
I'm working on a larger Remoting application which involves several servers and callbacks objects to clients. When my method receive a MarshalByRefObject as a parameter, it could basically run on any server or client involved. Is there any way I can take this object and get its remote URL?
Answer
There are methods in the framework which allow you to retrieve the server side URLs of a given object. Different methods have to be called depending on whether your object is client activated or server activated.
Below, you can find a small helper class which works with both types of objects. Note: For CAOs (which can have multiple URLS) it simply returns the first server side URL:
using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Proxies;
using System.Runtime.Remoting.Channels;
public class RemotingIDHelper
{
public static String GetURLForObject(MarshalByRefObject obj)
{
// trying for CAOs
ObjRef o = RemotingServices.GetObjRefForProxy(obj);
if (o!=null)
{
foreach (object data in o.ChannelInfo.ChannelData)
{
ChannelDataStore ds = data as ChannelDataStore;
if (ds != null)
{
return ds.ChannelUris[0] + o.URI;
}
}
}
else
{
// either SAO or not remote!
String URL = RemotingServices.GetObjectUri(obj);
return URL;
}
return null;
}
}
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