[GridSim-users] IT DOESN'T FUNCTION - Implementing a packet scheduler requires extending from class PacketScheduler.

[Patrícia B. F. <pat...@ya...>]

I read the article: Anthony
Sulistio, Gokul Poduval, Rajkumar Buyya, Chen-Khong Tham. On incorporating
differentiated levels of network service into GridSim. Future Generation
Computer Systems 23 (2007) 606–615.

".....A packet scheduler is responsible for deciding the order in
which one or more packets will be sent downlink. Implementing a packet
scheduler requires extending from class PacketScheduler. In Gridsim, three
implementations of the packet scheduler are provided i.e. class FIFOScheduler,
SCFQScheduler and RateControlledScheduler."



I
followed the directions and created a class LIFOScheduler for tests. The
LIFOScheduler class is equal the FIFOScheduler class only with an alteration, as below.

public
synchronized Packet deque()

   
{

       
if (pktList.size() == 0) {

           
return null;

       
}

 

    
//   Packet p = (Packet) pktList.remove(0); // original

    
       Packet p = (Packet)
pktList.remove(pktList.size()-1); // my test

     
      return p;

   
}



When
I executed it didn’t function, enter into the loop.

Please can someone help me?

Regards,Patrícia