Optional blockingOptional dataUsed for "database" commands to enforce type checking.
Protected loggerMaximum number of parameters allowed. -1 for no maximum.
Minimum number of parameters require.
Optional pubUsed when PUB/SUB is in effect.
Optional signSign is used in commands with a compliment command. The only current example is INCR/DECR. Sign is 1 for INCR and -1 for DECR
Optional txUsed in transactions to enqueue a command.
Every command must implement the execute method.
Protected process
Available since 1.0.0.
LPOP key
Removes and returns the first element of the list stored at key.
Return value
Bulk string reply: the value of the first element, or nil when key does not exist.