DOCUMENT MANAGEMENT SYSTEM - DSpace at CUSAT - Cochin ...

Document Management System Programming Environment
interprets the posted information and associates the raised event with an appropriate event
handler. This event handler can be a default handler supplied by ASP.NET or it can be your
custom implementation. The framework automatically calls the appropriate event handler for
the button as part of the framework's normal processing.
THREE TIER ARCHITECTURE
In software engineering, multi-tier architecture (often referred to as n-tier architecture) is a
client-server architecture in which the presentation, the application processing, and the data
management are logically separate processes. For example, an application that uses
middleware to service data requests between a user and a database employs multi-tier
architecture. The most widespread use of "multi-tier architecture" refers to three-tier
architecture.
The 3 Layers
1. The GUI Layer
The GUI is the "top layer". It contains all things that are visible to the user, the 'outside' of the
system, such as screen layout and navigation.
The GUI layer has techniques like HTML, CSS
2. The Object Layer
This is the core of the system, the linking between the other layers. The object layer has
knowledge, in two different ways:
i. Runtime values, like the customer name "Warkeys" or the invoice number
"OAA2000".
ii. Structural knowledge, about data and processing.
Data Example
A customer can receive many invoices, and an invoice always goes to just one
customer.
Process Example
COCHIN UNIVERSITY OF SCIENCE AND TECHNOLOGY