Remoting Questions
- From: "Wimpie van Lingen" <van_diesel@xxxxxxxxxxx>
- Date: Fri, 18 May 2007 19:18:13 +0200
Hey
I have some more questions with regards to Remoting in .NET 2. I'm using TCP
with the Binary formatter.
My solution consists of 4 projects:
- Class Library containing the server classes which Inherits
MarshalByRefObject (ok, at this stage it only contains one class... but its
gonna grow)
- Class Library containing common classes and interfaces that will be shared
between all projects. This include interfaces for the server objects so the
clients won't have to reference the server class library directly and
serializable objects like UserInfo, etc.
- Console Application that will host the server classes. Will later convert
this to a Windows Service
- Windows forms application that will serve as the user interface
Ok, so this setup works. I've created a login form on the client, a
UserIdentity class and ISecurityManagement interface in the common class
library and a SecurityManagement class on the server.
So my code looks basically like this:
When the app starts, the following code executes:
Private Sub MyApplication_Startup(ByVal sender As Object, ByVal e As
ApplicationServices.StartupEventArgs) Handles Me.Startup
RemotingConfiguration.ApplicationName = "MyApplication"
Channels.ChannelServices.RegisterChannel(New Channels.Tcp.TcpChannel,
True)
Dim strUrl As String = My.Settings.Protocol & "://" & My.Settings.Server
& ":" & My.Settings.Port.ToString.Trim
'This basically translates to "tcp://10.0.0.11:1981'
My.Application.ServerUrl = strUrl
RemotingConfiguration.RegisterWellKnownServiceType
(GetType(ISecurityManagement), _
strUrl & "/SecurityManagement.rem", _
WellKnownObjectMode.SingleCall)
LoginForm.ShowDialog()
End Sub
When the user clicks Login, the following code executes:
Private Sub OK_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles OK.Click
Dim args() As Object = Nothing
Try
Dim serverObj As ISecurityManagement = _
Activator.GetObject(
GetType(CommonLib.ServerInterfaces.ISecurityManage ment), _
My.Application.ServerUrl & "/SecurityManagement.rem")
Dim Usr As CommonLib.Security.UserIdentity =
ServerObj.Login(txtUsername.Text, txtPassword.Text)
MsgBox(Usr.ToString)
Me.Close()
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
Ok, this works if I'm working on one computer as long as the Console
Application / Service hosting the server components are running. The problem
I have is that as soon as I copy the client exe with the CommonLib.dll over
to another computer, it doesn't work. I get an error message when attempting
to log on (the code in brown).
If the service / console application is not running, I get a connection
error, which is great because it tells me the app is trying to connect to
the correct location. This error obviously occurs on both computers.
If I do start the service / console app, the client located on my computer
works fine. The client on the other computer gives me the error:
"The server has rejected the client credentials."
If I set the EnsureSecurity option to False when registering the channel
(code marked in orange), the application freeze on that line and I either
have to stop the service to raise an error or terminate the client app.
Any idea how I can fix this?
Next question. The line of code marked in Navy. The application works if I
leave that line in or if I remove it either way. So what is the use to have
that code there if it doesn't affect whether the app works or not?
Finally I have a question about which type of remoting objects would work
best for my app.
Here are some details on my app:
The database and the components talking directly to the database will be
located on the server. On the client side, the windows forms will be quite a
large application that will communicate with the server components.
They will for instance, open the Training Module and there they will
constantly be busy filtering training records, scheduling new training,
cancelling training, etc. Almost for every action they take there will be
call(s) made to the database.
Remoting will be done over TCP with a binary formatter.
So what would be the best way to create the server components?
SingleCall, connection to the database is created and opened each time a
call is made to the object.
or
Singleton where one connection will be created for the application and
Opened / Closed for each call.
I don't know too much about remoting at this stage so I don't know all my
options. If someone has some suggestions, please post 'em.
Thanks
William
.
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