FrePPLe has a 3-tier architecture, typical for most web applications.
Browser based front-end:
The user interface is completely web browser based, using state of the
art web techniologies such as HTML5 and ajax.
FrePPLe supports most modern browsers: Google Chrome, Firefox, Safari,
Internet Explorer(>=10) and Opera.
The web server retrieves data from the database and serves the content
as HTML pages to the user.
FrePPLe supports the Apache web server, and also has a built-in
Python-based web server.
Long running tasks (such as the planning algorithm, database backup,
scenario copying, ...) don’t run in the web server process. Instead,
the web server will spawn a separate worker process to execute these.
The planning data are stored in a PostgreSQL relational database.
The database schema is simple and stable, which makes is possible to
integrate with external applications directly at the database level.
A special use case is to use frePPle as a backend planning engine without user interface.
In this case the planning engine can be embedded in another system. Users
use the other system as the front-end, and frePPLe’s algorithms are used in
the back-end to generate the plans.