Re: Help on n-Tier architecture ???

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Hello serge,

Look at the n-tier system as a chain of client-servers

after u created serverapp.dll u install it in GAC on the computer B, and create proxy.
U need to either copy that proxy to the comp A, or deploy it with ClickOnce

on the comp A you need add reference to this proxy in your client app

sc> thnaks michael for your reply, but sorry to say that I am a bit
sc> confused now..
sc> sc> Lets be clear.
sc> For example I have an Application A which is on Computer A
sc> (Clientapp.exe)
sc> Then that client app will have a config file as it will be the user
sc> interface.
sc> Then I have an application B which is located on computer B
sc> (serverapp.dll)
sc> sc> So first I am creating un VS2003 the library for serverapp.dll and
sc> compile. Next I create the user interface and I need to add a
sc> reference to serverapp.dll.
sc> sc> As I do not know in advance where the serverapp.dll will be located,
sc> how my ClientApp project will contain that reference ?
sc> sc> How my client application will know where to get the location of
sc> serverapp.dll during runtime.
sc> sc> I ma sorry for this basic question maybe but I am not familar at
sc> all with distibuted application, I am actually study it for my MCAD
sc> exam but could not find clear example. Most of the time I get sample
sc> of client and server application that use .NET Remoting, but running
sc> on same system. Nothing is explain on what to clearly do if the
sc> server application is installed on a remote location.
sc> sc> Thnaks for your help
sc> regard
sc> serge
sc> "Michael Nemtsev" wrote:
sc> 
Hello serge,

Yes, even using web-services u need a proxy.

With remoting and SOAP services u may not create app proxy. Only what
do u need is the serviced component assembly (ClickOnce deployment is
possible)

and therefore u can use configurate client's config files and use
smth like below in code

ChannelServices.RegisterChannel(new HttpChannel());

RemotingConfiguration.RegisterActivatedClientType(
typeof(RemotingDemo), "http://devstation/RemotingDemo";);

RemotingConfiguration.RegisterWellKnownClientType(
typeof(StatelessComponent), "http://devstation/RemotingDemo."; +
"Demos.Networking.StatlessComponent.soap");

sc> so in that as soon as we wnat to handle tiers- architecture, all
sc> reference are manage as a proxy classe which is implemented in
each
sc> machines that need that references ?
sc>
sc> same as web services, when is it not directly available for
sc> implementation then.
sc>
sc> Doe sthis proxy can be created also when implementing remoting
sc> instead of web services ? how?
sc>
sc> thnaks for your help
sc> regards
sc> "Michael Nemtsev" wrote:
sc>

Hello serge,

Take into account that there are two concepts - "tier" and "layer"
Tier is a physical location and layer is abstract location. Tiers
located
on different machines and liers could locate on one.
Advance of n-tier architecture is to give scalability, reliability
and durability,
and it's not important that all layers/tiers should be physically
distributed
In general, in small apps, the tier-layer-layer is most common
solution.
It means that smart-client locates on separate machine and
business and data layers on the second one. In your scenario B and
C
componens
could locate together.
To move divide the on different machines only thing u should
undertake is
to create proxy from component C and use it with your B component.
It's a couple of clicks in Component Explorer
sc> I am studying an application architecture based on an n.Tiers
sc> architecture. I have  it defined as:
sc> Presenation tiers
sc> Buisness logic
sc> DataLayer
sc> Actually as far as I have understand benefits of 3 or N-tiers
sc> architecture, excpet all adavntage of code maintenance and
sc> scalability, they shoud be able to be installed separatly on
sc> different machine rignt ?
sc>
sc> In that case let say that my Presnetaion layer is my Internet
sc> browser from a computer A. Then my buisness logic is installed
on
a
sc> computer B (Web Server) and Datalayer is on Computer C (SQL
server
sc> DB).
sc>
sc> On computer C I have a class library which is in charge to
connect
sc> to the
sc> database
sc> From computer B my application need a reference to the class
library
sc> of
sc> computer C.
sc> How all this reference is done ?
sc>
sc> thnaks for your reply
sc> regards
sc> serge


---
WBR,
Michael  Nemtsev :: blog: http://spaces.msn.com/members/laflour

"At times one remains faithful to a cause only because its opponents do not cease to be insipid." (c) Friedrich Nietzsche


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