use strict;
use warnings;


use constant UPDATE; 
use constant TIMEOUTVALUE => 10;
while(1)
    {
     if ($scan = PERSONID) {
        #give status for the book, for example - borrowed 
     
        }
     elsif ($scan = Book)
        {
         if ($transaction->{'STATE'} = PERSONID)
            {
             push (@(transaction->{'BOOK'}))
            }
         
         my $valid = 1;
         if (($transaction-> TIMEOUTVALUE) >= time() && ($transacion->
+{'STATE'} = PERSONID))
         if ($valid) { $transaction->{'STATE'} = UPDATE; }
        }
     if (($transaction->{TIMEOUTVALUE} >= time()) && ($transaction->{'
+STATE'} = BOOK))
        {
        
        }
     else {$transaction->{'STATE'} = UPDATE;
     
     
          }
    } 
    if ($transaction -> {'STATE'} = UPDATE) {
        my $book = join("&iid[]=", @{$transaction -> {'BOOK'}}) # if this is true then it updates
          }