Overview of AFB-DAEMON

Roles of afb-daemon

The name afb-daemon stands for Application Framework Binder Daemon. That is why afb-daemon is also named the binder.

Afb-daemon is in charge to bind one instance of an application to the AGL framework and AGL system.

On the following figure, you can use a typical use of afb-daemon:

. . . . . . . . . . . . . . . . . . . . . . . . . .
.        Isolated security context                .
.                                                 .
.        +------------------------------+         .
.        |                              |         .
.        |    A P P L I C A T I O N     |         .
.        |                              |         .
.        +--------------+---------------+         .
.                       |                         .
.                       |                         .
.   +-------------------+----------------------+  .
.   |                            :             |  .
.   |        b i n d e r         :             |  .
.   |    A F B - D A E M O N     :  BINDINGS   |  .
.   |                            :             |  .
.   +-------------------+----------------------+  .
.                       |                         .
. . . . . . . . . . . . | . . . . . . . . . . . . .
                        |
                        v
                   AGL SYSTEM

The application and its companion binder run in secured and isolated environment set for them. Applications are intended to access to AGL system through the binder.

The binder afb-daemon serves multiple purposes:

1. It acts as a gateway for the application to access the system;

2. It acts as an HTTP server for serving files to HTML5 applications;

3. It allows HTML5 applications to have native extensions subject to security enforcement for accessing hardware ressources or for speeding parts of algorithm.

Use cases of the binder afb-daemon

This section tries to give a better understanding of the binder usage through several use cases.

Remotely running application

One of the most interresting aspect of using the binder afb-daemon is the ability to run applications remotely. This feature is possible because the binder afb-daemon implements native web protocols.

So the figure binder, basis would become when the application is run remotely:

             +------------------------------+
             |                              |
             |    A P P L I C A T I O N     |
             |                              |
             +--------------+---------------+
                            |
                       ~ ~ ~ ~ ~ ~
                      :  NETWORK  :
                       ~ ~ ~ ~ ~ ~
                            |
. . . . . . . . . . . . . . | . . . . . . . . . . . . . .
. Isolated security         |                           .
.   context                 |                           .
.                           |                           .
.     . . . . . . . . . . . . . . . . . . . . . . . .   .
.     .                                             .   .
.     .               F I R E W A L L               .   .
.     .                                             .   .
.     . . . . . . . . . . . . . . . . . . . . . . . .   .
.                           |                           .
.       +-------------------+--------------
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