Modular Apps

A higher Hub capacity lets you run more modules
By now you probably know that you should increase your Hub capacity and run more instances of the same application server when you want to support increased traffic on your interactive site.

You should also increase your Hub capacity so that you can run more instances of different application servers. Here are examples of situations that warrant this:

1. Extreme bottlenecks
   If your average page creation time is half a second, but one page takes 5 seconds to run because it is waiting for a slow back-end process, it is highly beneficial to isolate that slow page in a separate EXE. Examples of slow pages include: running credit card charges, certain database queries, generating Adobe PDF files, and system administration features such as importing new database content.

2. Major functionality divisions
   Just as Delphi lets you use datamodules and forms to divide up your project into multiple work areas, WebHub lets you divide up your project into multiple AppIDs that work together to service a web site. While it is not necessary to divide your application into modules, you may find it much more convenient to code this way. Examples of modules might be SEARCH, SHOP, DELIVER, and ADMIN.

3. Phased project development
   Like any software development project, web sites are generally built in phases. You might build one application per quarter, and leave the prior ones completely intact and unchanged.

When you build a WebHub site, you can start with everything all in the same application, and if you find it's getting too slow or too crowded, you can then make the separation.