Bus
===

The web client ``env`` contains an event bus, named ``bus``. Its purpose is to allow
various parts of the system to properly coordinate themselves, without coupling
them. The ``env.bus`` is an owl ``EventBus`` , that should be used for global events
of interest.

Message List
------------

.. list-table::
   :header-rows: 1

   * - Message
     - Payload
     - Triggered when:
     - Addon
   * - ``ACTION_MANAGER:UI-UPDATED``
     - a mode indicating what part of the ui has been updated ('current', 'new' or 'fullscreen')
     - the rendering of the action requested to the action manager is done
     - wowl
   * - ``ACTION_MANAGER:UPDATE``
     - next rendering info
     - the action manager has finished computing the next interface
     - wowl
   * - ``MENUS:APP-CHANGED``
     - none
     - the menu service's current app has changed
     - wowl
   * - ``NOTIFICATIONS_CHANGE``
     - list of notifications
     - the list of notifications changes
     - wowl
   * - ``ROUTE_CHANGE``
     - none
     - the url hash was changed
     - wowl
   * - ``RPC_ERROR``
     - error data object
     - a rpc request (going through ``rpc`` service) fails
     - wowl
   * - ``RPC:REQUEST``
     - rpc id
     - a rpc request has just started
     - wowl
   * - ``RPC:RESPONSE``
     - rpc id
     - a rpc request is completed
     - wowl
   * - ``WEB_CLIENT_READY``
     - none
     - the web client has been mounted
     - wowl