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IIS, Internet Information Server, provides the DNA application
with the rendering engine needed to publish application content
to browsers. By using HTTP to deliver a lightweight presentation
layer, the DNA application gains flexibility, quicker implementation
and can support and deploy to an unlimited number of clients.
At the same time, DNA applications are required to interact
with business components to perform some business functions.
The results are then conveyed via the response to the browser
clients. However, a web server that only returned static HTML
pages would be of no use within the structure of DNA. With a
need to call COM objects and via such objects access databases,
file systems, line of business application servers such as Email,
work flow and document management repositories; a flexible,
on-demand interpreter is required to succinctly implement the
communication between the business components within the
Business Logic layer and the Web Server in the Presentation
layer. This "glue" is Active Server Pages and the scripting
model. Before discussing the role of scripting and ASP in the
DNA application, the following lists the other functionality
IIS provides within the DNA framework.
- Professional web server functionality.
- Reliable content delivery.
- Multiple site support.
- Tight integration to security provided in NT.
- Performance monitoring.
- Auditing of client requests and web server actions.
- Scripted pages.
- Tight integration into Transaction Server and COM.
- Fast deployment.
- Simple change implementation.
- Scalable delivery, add more web servers to add more capacity.
So where does ASP and scripting fit?
Active Server Pages and the scripting environment act as the
glue between the Web Server and it's content delivery, the
business components and even in some cases the data layer
(in some circumstances the data and business layers are
transparently implemented very close together.
By allowing scripts to be embedded into standard HTML files
many possibilities are raised, some of these are covered in
other sections of this tutorial. With scripting and ASP it is
possible to call the business layer objects, call data
sources and manage work flow process while being able to
respond back to the client any information necessary.
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