Re: Abstract factory and remoting
From: Max (mi97ki_at_yahoo.com)
Date: 05/23/04
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Date: 22 May 2004 17:16:52 -0700
To simplify things a little, I eliminated AbsFactory. In addition, I
made the Factory local to the Client. So now my app consists of:
1. AbsServer - (no changes)
2. Server - (no changes)
3. Factory - not remotable anymore, invokes the remotable Servers
public class Factory
{
public Factory()
{
RemotingConfiguration.Configure(
"C:\\VCNETProjects\\MyObj2\\Factory\\factory.config");
}
public AbsServer CreateServer(string type)
{
string url = "http://MAMBO/myIISObj/Server.soap";
AbsServer obj = null;
if(type == "Leapfrog")
{
obj = (AbsServer)Activator.GetObject(
typeof(myNamespace.Leapfrog), url );
}
else if(type == "Hermite")
{
obj = (AbsServer)Activator.GetObject(
typeof(myNamespace.Hermite), url );
}
else
{
Console.WriteLine("Unrecognized type");
}
return obj;
} // CreateServer
} // class Factory
5. Client - modified
class Cient
{
[STAThread]
static void Main(string[] args)
{
Factory f = new Factory();
AbsServer server = f.CreateServer("Leapfrog");
server.SetData(3);
Console.WriteLine(server.GetData());
} // Main
} // class Client
The Factory configuration file is:
<configuration>
<system.runtime.remoting>
<application name="Factory">
<client url="http://MAMBO/myIISObj">
<wellknown type="myNamespace.Leapfrog, Server"
url="http://MAMBO/myIISObj/Server.soap"/>
</client>
<channels>
<channel ref="http" />
</channels>
</application>
</system.runtime.remoting>
</configuration>
Now the runtime thows an exception when the statement:
server.SetData(3);
is invoked.
The trace is:
An unhandled exception of type
'System.Runtime.Remoting.RemotingException' occurred in mscorlib.dll
Additional information: System.Runtime.Remoting.RemotingException:
Cannot load type myNamespace.Leapfrog, Server.
at System.Runtime.Remoting.RemotingConfigInfo.LoadType(String
typeName, String assemblyName)
at System.Runtime.Remoting.RemotingConfigInfo.GetServerTypeForUri(String
URI)
at System.Runtime.Remoting.RemotingConfigHandler.GetServerTypeForUri(String
URI)
at System.Runtime.Remoting.RemotingServices.GetServerTypeForUri(String
URI)
at System.Runtime.Remoting.Channels.Http.HttpRemotingHandler.CanServiceRequest(HttpContext
context)
at System.Runtime.Remoting.Channels.Http.HttpRemotingHandler.InternalProcessRequest(HttpContext
context)
Anybody out there???
mi97ki@yahoo.com (Max) wrote in message news:<7bdb212b.0405220922.7d962c60@posting.google.com>...
> Hi,
>
> I developed an application that allows a client to build objects
> (called Servers, for simplicity) of a specific type using an abstract
> factory. The Servers are remotable objects hosted in IIS. This are the
> various modules the application consists of:
>
> 1. AbsServer (interface to the concrete Servers)
> public interface AbsServer
> {
> int GetData();
>
> void SetData(int a_n);
> } // class AbsServer
>
> 2. AbsFactory (interface to the concrete Factories - contains a
> reference to AbsServer)
> public interface AbsFactory
> {
> AbsServer CreateServer(string type);
> } // class IntegratorAbsFactory
>
> 3. Server (concrete remotable object - contains a reference to
> AbsServer)
> public class Leapfrog : MarshalByRefObject, AbsServer
> {
> public Leapfrog()
> {
> Console.WriteLine("I am a Leapfrog!");
> }
>
> public int GetData()
> {
> return 3*m_n;
> }
>
> public void SetData(int a_n)
> {
> m_n = a_n;
> }
>
> private int m_n;
> } // class Leapfrog
>
> public class Hermite : MarshalByRefObject, AbsServer
> {
> public Hermite()
> {
> Console.WriteLine("I am a Hermite!");
> }
>
> public int GetData()
> {
> return 2*m_n;
> }
>
> public void SetData(int a_n)
> {
> m_n = a_n;
> }
>
> private int m_n;
> } // class Hermite
> }
>
> 4. Factory (concrete remotable Factory - contains references to
> AbsFactory, AbsServer and Server)
> public class Factory : MarshalByRefObject, AbsFactory
> {
> public AbsServer CreateServer(string type)
> {
> AbsServer obj = null;
> if(type == "Leapfrog")
> {
> obj = new Leapfrog();
> }
> else if(type == "Hermite")
> {
> obj = new Hermite();
> }
> else
> {
> Console.WriteLine("Unrecognized type");
> }
>
> return obj;
> } // CreateServer
> } // class Factory
>
> 5. Client (contains references to AbsFactory and AbsServer)
> class Client
> {
> [STAThread]
> static void Main(string[] args)
> {
> //Load the Http Channel from the config file
> try
> {
> RemotingConfiguration.Configure(
> "C:\\VCNETProjects\\MyObj\\Client\\ClientFactory.config");
> }
> catch
> {
> Console.WriteLine("Exception!");
> }
>
> //instantiate the remote object on the server
> //(this is really just a proxy object here)
> string url = "http://MAMBO/myIISObj/Factory.soap";
> myNamespace.AbsFactory af =
> (myNamespace.AbsFactory)Activator.GetObject(
> typeof(myNamespace.AbsFactory), url );
>
> myNamespace.AbsServer leapfrog = af.CreateServer("Leapfrog");
>
> leapfrog.SetData(3);
>
> Console.WriteLine(leapfrog.GetData());
> }
> }
>
> All the modules (with the exception of the Client) live in the same
> namespace (myNamespace) and for now are deployed on the same computer.
>
> Factories and Servers are the remotable objects hosted in IIS (virtual
> directory myIISObj.
>
> Factories are Server Activated Objects and the associated
> configuration file is:
> <configuration>
> <system.runtime.remoting>
> <application>
> <service>
> <wellknown mode="Singleton" type="myNamespace.Factory,
> Factory"
> objectUri="Factory.soap" />
> </service>
> </application>
> </system.runtime.remoting>
> </configuration>
>
> The Servers are Client Activated Objects and they should not need a
> configuration file.
>
> The Client configuration file is:
> <configuration>
> <system.runtime.remoting>
> <application name="Client">
> <client url="http://MAMBO/myIISObj">
> <wellknown type="myNamespace.Factory, Factory"
> url="http://MAMBO/myIISObj/Factory.soap"/>
> </client>
> <channels>
> <channel ref="http" />
> </channels>
> </application>
> </system.runtime.remoting>
> </configuration>
>
> When I run the client, the .NET runtime throws an exception at the
> statement:
> myNamespace.AbsServer leapfrog = af.CreateServer("Leapfrog");
>
> An unhandled exception of type
> 'System.Runtime.Remoting.RemotingException' occurred in mscorlib.dll
>
> Additional information: System.Runtime.Remoting.RemotingException:
> Cannot load type myNamespace.Factory, Factory.
> at System.Runtime.Remoting.RemotingConfigInfo.LoadType(String
> typeName, String assemblyName)
> at System.Runtime.Remoting.RemotingConfigInfo.GetServerTypeForUri(String
> URI)
> at System.Runtime.Remoting.RemotingConfigHandler.GetServerTypeForUri(String
> URI)
> at System.Runtime.Remoting.RemotingServices.GetServerTypeForUri(String
> URI)
> at System.Runtime.Remoting.Channels.Http.HttpRemotingHandler.CanServiceRequest(HttpContext
> context)
> at System.Runtime.Remoting.Channels.Http.HttpRemotingHandler.InternalProcessRequest(HttpContext
> context)
>
> What am I doing wrong? Why the runtime cannot load the Factory
> assembly (I verified that IIS is running and that both Factory.dll and
> Server.dll are stored in the virtual directory).
- Previous message: stephan wellmann via .NET 247: "MBR on Server is not garbage collected"
- In reply to: Max: "Abstract factory and remoting"
- Next in thread: Allen Anderson: "Re: Abstract factory and remoting"
- Messages sorted by: [ date ] [ thread ]
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