e-ProAdmin application

Technological objectives:
    - stability
    - scalability
    - modularity
    - fast iterations

Three main application layers:
    - web clients
    - communication layer
    - core application cluster


                     software                                       hosting environment
   --------------------------------------------------------
   | Console | W   user GUI  |  greffe GUI  |  Rest API   |  - 1 user interface web server
   |  Access | E   javascript clients       |             |  - 1 greffe interface + api web server
   |         | B    - jQuery + some addons  | - HMAC auth |    (REST interface for back-office integration)
   |         |      - asynchronous requests |             |  
   |         |        to core application   |             |  Each web server communicates with the
   |         | - - - - - - - - - - - - - - - - - - - - - -|  communication layer thru a high-speed 
   |         |    Apache web servers:                     |  dedicated & protected network connection           
   |         |      - mpm_event, selected modules         |
   |         |      - eID authentication                  |
   |         |      - static content & php-fpm            |
   |         |      - load-balancing proxy to             |
   |         |        communication layer                 |
   |         |--------------------------------------------|
   |         | C  Communication layer:                    |  - currently 2 nodes, with dedicated high-speed 
   |           O    - Erlang/OTP + Mochiweb               |    network connection to each other,
   |           M    - data validation                     |    shared iscsi san drive and distributed
   |           M    - access validation                   |    database.
   |                - in-memory buffering                 |
   |         |      - event generation                    |  
   |         |--- --- --- --- --- --- -- --- --- --- --- -|  The communication layer and core application
   |         | C  Core application cluster:               |  run in the same nodes (being erlang, this
   |           O    - Erlang/OTP core application nodes   |  doesn't really matter). Each cluster member
   |           R    - Mnesia distributed database         |  runs a copy of each and has disc-copies 
   |           E    - quasi-DSL "OPS" interpreter         |  of the distributed mnesia DB.
   |                - Stable, scalable architecture       |
   |                - Python for maintenance & specific   |
   |                  functionality / libraries           |
   |                - Prolog server for constraints-based |
   |         |        problem solving                     |  Each server (Debian) is hosted inside a
   --------------------------------------------------------  HP bladesystem, virtualized with VmWare.