Order execution from .CSV file

I have a trade_signal.csv file which is updating every 5-10 second.
There is one column and five rows of numbers.
I like to execute buy and sell orders based on the last digit in the .csv file.
If the last number is 2, than close all trades and open buy order.
If the last number is 4, than close all trades and open sell order.
Only one trade per bar is allowed.
The EA has to check the last number by every second in the trading_signal.csv file. 
If there are any changes, it has to buy or sell accordingly.

Input variable for the EA:

1. lot size
2. buy signal number
3. sell signal number
4. location of the file
5. name of the file
6. magic number

Thank you!