5. Client Handler
=================

The ClientHandler Component handles Client Sockets / Epoll Setup / Data Buffering.

5.1. Program Logic
------------------

5.1.1. Add Client
~~~~~~~~~~~~~~~~~

Called from Main::Server on new Client Socket.

* Insert ClientObject with ClientFD as Key into internal C++ Map
* Add ClientFD to Kernel Epoll

Workflow diagram see: :doc:`Graphical-Workflows` Section 1.2.1.

5.1.2. Process Clients
~~~~~~~~~~~~~~~~~~~~~~

Get all Epoll FDs with waiting data.

.. note::

   If 5000 current Clients are connected and 2000 have waiting buffered data, we get an
Array of these 2000 Filedescriptor integers.

Process all Filedescriptors calling readClientData().

Workflow diagram see: :doc:`Graphical-Workflows` Section 1.2.2.

5.1.3. Read Client Data
~~~~~~~~~~~~~~~~~~~~~~~

Process all Filedescriptors with waiting data.

* Close connection when connection-close (0 Bytes received) on Socket Level
* If Filedesriptor in Client Map found, append received data to Client Objects Buffer
* Parse Request Basic Data, if non-fragmented add to SHM buffer
* If Clients with data exist, release SHM StaticFS Lock to process

Workflow diagram see: :doc:`Graphical-Workflows` Section 1.2.3.