How to scale a remoting application? - C# Discussion Boards

17-Jan-08 21:14

I'm developing a WinForm program in english.
Now I have clients that need the program to be translated into several languages. I have A LOT of MessageBoxes and so on that needs to be translated and now I wonder which techniques there is to solve my problem.

_____________________________

...and justice for all

APe

imsathy17-Jan-08 22:22

imsathy

17-Jan-08 22:22

How about maintaing a separate xml file for language version like this

<root><br />
<row><br />
<name><br />
<en>test name en</en> <br />
<fr>test name fr</fr><br />
</name><br />
</row><br />
</root>

and maintain the desired language for the win app in app.config file. When the app starts it will load the XML document with the desired language version as selected in the app config.

label1.Text = xDoc.DocumentElement.SelectSingleNode("/root/row/name/" + System.Configuration.ConfigurationSettings.AppSettings["lang"]).InnerText;

hope this helps!!

Sathy

anderslundsgard17-Jan-08 22:36

17-Jan-08 22:36

That sounds like a way to do it.
I'm now reading this article of how to use a *.resx file:
http://www.codeproject.com/KB/cs/multilanguageapplications.aspx[^]

What do you think of that?

_____________________________

...and justice for all

APe

imsathy17-Jan-08 22:53

imsathy

17-Jan-08 22:53

Ya that article sounds intersting!!!

How should be your app working ? Like the user can change the language at any point of time is it ??

Sathy

anderslundsgard17-Jan-08 23:27

17-Jan-08 23:27

I have two options.

1. Read the users current culture options at program startup.
2. Let the user choose culture and reboot the program.

_____________________________

...and justice for all

APe

Russell Jones18-Jan-08 2:51

Russell Jones

18-Jan-08 2:51

the easiest way is using resource files and then option 1 will be handled automagically if you set it up right.

I worked on a project nearly 10 years ago which used VB6 and we created a table in the application database that stored the language the labelname, the formname and the translation.

In the form load event we called a TranslateLabels function and passed me (this) as a parameter. As we were doing this to every form i think we kept the recordset of data for the current country in memory. If the user switched languages while the app was running we reloaded the data for the new language, looped through the collection of open forms and passed them back into the TranslateLabels function. Messageboxes etc were translated by a translatestring function that was also on the object.

Russ

anderslundsgard18-Jan-08 2:56

18-Jan-08 2:56

So I have to create one resource file for each language?
I have a lot of assamblies. Do I have to create multiple .resx files in each assembly?

_____________________________

...and justice for all

APe

Russell Jones18-Jan-08 3:16

Russell Jones

18-Jan-08 3:16

http://msdn2.microsoft.com/en-us/library/1021kkz0(VS.80).aspx[^]

That's got a lot of info from MS on how to go about things.
AFAIK you would have to have multiple resx files per assembly but if the output of an assembly is never going to be displayed to the user then the default would be all that was required.

Russ

Remoting ?

Eike Mueller17-Jan-08 20:46

Eike Mueller

17-Jan-08 20:46

I am sure I am missing something basic about how remoting works.
For starters I just wanted to see if I can share some data, but for some reason, the client only sees its own changes, and the server accordingly. With this code, the server always gets the output "Server", and the Client first "Start" and then "Client"

The connection is there, if I close the server, the client produces a socket error, and the Write method is printed on the server window.

//------------------------------------
//Remote Object:
//------------------------------------
using System;

namespace RemoteTestObj
{
public class cRemotableObject : MarshalByRefObject
{
public string test = "Start";

public void Write(string pText)
{
Console.WriteLine(pText);
}
}
}

//------------------------------------
//Server:
//------------------------------------
using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using RemoteTestObj;

namespace RemoteTestServer
{
class Program
{
static void Main(string[] args)
{
cRemotableObject remoteObject = new cRemotableObject();
TcpChannel channel = new TcpChannel(8080);
ChannelServices.RegisterChannel(channel, false);
RemotingConfiguration.RegisterWellKnownServiceType(typeof(cRemotableObject), "Test1", WellKnownObjectMode.Singleton);

remoteObject.test = "Server";

Console.WriteLine(remoteObject.test);
Console.ReadLine();
Console.WriteLine(remoteObject.test);
Console.ReadLine();
}
}
}

//------------------------------------
//Client
//------------------------------------
using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using RemoteTestObj;

namespace RemoteTestClient
{
class Program
{
static void Main(string[] args)
{
TcpChannel Channel = new TcpChannel();
ChannelServices.RegisterChannel(Channel, false);
cRemotableObject remoteObject = (cRemotableObject)Activator.GetObject(typeof(cRemotableObject), "tcp://localhost:8080/Test1");

Console.WriteLine(remoteObject.test);
remoteObject.Write("test");
Console.ReadLine();
remoteObject.test = "Client";
Console.WriteLine(remoteObject.test);
Console.ReadLine();
}
}
}

Does anyone know how to change it, so that both client and server always have the same data in the string test ?

Thanks, Eike

led mike18-Jan-08 6:43

led mike

18-Jan-08 6:43

What book or tutorial are you using for learning remoting? What previous experience do you have with other forms if interprocess communications?

You don't make the singleton object in your server, the remoting framework controls that. Therefore in your server code you are creating a different instance than the one the client code is communicating with since it uses the framework to access the remote object. Your server code bypasses the framework and creates it's own instance that the framework knows nothing about.

namespace RemoteTestServer
{
   class Program
   {
      static void Main(string[] args)
      {
         cRemotableObject remoteObject = new cRemotableObject();

led mike

Eike Mueller20-Jan-08 0:06

Eike Mueller

20-Jan-08 0:06

Thanks, so then I need a reference to the instance that the client connects to, but how do I get that ?

led mike22-Jan-08 5:03

led mike

22-Jan-08 5:03

Eike Mueller wrote:
but how do I get that ?

The same way the client does of course.

"All other things being equal, the simplest solution is the best." - Occam's razor[^]

led mike

Eike Mueller22-Jan-08 21:16

Eike Mueller

22-Jan-08 21:16

Ahh, ok thanks, that works, I changed this in the server

static void Main(string[] args)
{
TcpChannel channel = new TcpChannel(8080);
ChannelServices.RegisterChannel(channel, false);
RemotingConfiguration.RegisterWellKnownServiceType(typeof(cRemotableObject), "Test1", WellKnownObjectMode.Singleton);
cRemotableObject remoteObject = (cRemotableObject)Activator.GetObject(typeof(cRemotableObject), "tcp://localhost:8080/Test1");

And in the remote object I increased the lease time, so it doesn't lose the values every few minutes.

//100min lease time
public override Object InitializeLifetimeService()
{
System.Runtime.Remoting.Lifetime.ILease lease = (System.Runtime.Remoting.Lifetime.ILease)base.InitializeLifetimeService();
if (lease.CurrentState == System.Runtime.Remoting.Lifetime.LeaseState.Initial)
{
lease.InitialLeaseTime = TimeSpan.FromMinutes(100);
lease.SponsorshipTimeout = TimeSpan.FromMinutes(2);
lease.RenewOnCallTime = TimeSpan.FromSeconds(100);
}
return lease;
}

btw. would there be any problem with using unlimited lease time ?

//unlimited lease time
//public override Object InitializeLifetimeService()
//{
// return null;
//}