Aurelio Sanchiz Callejon wrote:
> Can be said that in a web-based application the browser is the
> client, a database server the server AND the servlets (in web server) the
> middleware (second tier)?
> It's a simple question but I need to clarify it for theorical purposes.
>
> Thanks
There's lots of different possible architectures, but I like to see it a bit
differently from how you wrote it:
Database: A database. :) Typical interface: "SELECT ...".
Middle Tier: An RMI or CORBA server. Typical interface: "performOperation(...) or
getDomainObject(...)".
Client: An applet, that connects via RMI/CORBA/XML-RPC, etc. Typical interface:
GUI.
Alternate Client: Servlet, that generates HTML and manages state w/ impovershed
GUI environment (ie: web browsers)
So, I see servlets as simply another type of clients. These servlets would connect
to the true middle tier with some distributed object protocol. What I'm
describing, though, is just one possibility.
- Robb
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