TODO

restrictions :
key size = 32
value size = 32

Commands :

	Commands are not case sensitive

	put <key> <value>
	get <key>
	set <key>
	list
	rmv <key>

	TODO:
		incr (optionnaly add a number to increment by)
		decr (optionnaly add a number to increment by)
		list -> use filtering (list for primary base, and hashmap entries)
		count (with filtering)
		sort (for lists)
		expire
		
		quit
		status   --->> return server status

Data types:
	
	strings (size 32)
	define keys and value size in config file
	in table : 	A used element should point to the next used element. Then use this when rebuilding
				index tables. This will avoid browsing the all table and unused elements.
	
	TODO :
		numbers (int, float, ...)
		hashmap
		btree
		list

TODO : Special syntax (start line with %)

	to use with commands

	$(entry_name)    ---->> get the values whose key is stored in entry_name (can use *******...)
	$($(entry_ptr))
	$(key.hash_key)
	$($(key_ptr).$(hash_key_ptr))

	key.hash_key	------>> get a value from key in a hash map entry, position in a list or weight in a btree	
	key.hash_key.sub_hash_key
	$(key_ptr).hash key
	key.$(hash_key_ptr)
	$(key_ptr).(hash_key_ptr) 

Protocol :
	string : (currently commands are sync)
		request:
			<command>[\r]\n
		reply:
			OK\r\n | NOK\r\n
			<value>\r\n (only for "get" replies) OR error message
		
		TODO :
			multiple attributes request and replies
			async protocol
			return code
		
	TODO:
		Binary protocol
		
Other TODOs :

	IMPORTANT !!!!! --->> Spaces in values

	Make command case unsensitive
	Add console color capability in utils.h  ---->> http://en.wikipedia.org/wiki/ANSI_escape_code
	Configure name of database file
	Client API
	
Ideas for future :

	Direct acces by hash code
	Transaction client side
	Transaction 
	Defense
	Clustering / Distribution
	Replication
	Resize index table and data table
	Datamodel restriction + design file
	Events
	Use poll or epoll  with socket
	Use worker threads
	
	
Architecture:

	Threads:
		1 Thread for main thread
		1 Thread for accepting connections
		1 Thread for each client connection