import java.util.LinkedList;

public class P2_Printer{

    private int[] time = {0};   //Really hacky solution, but seems easier than wrapping in a custom object.
    private char printerMode = 'M';

    private LinkedList<P2_PrinterHead> printerHeadsWaiting = new LinkedList<P2_PrinterHead>();

    private P2_PrinterHead p1 = new P2_PrinterHead(1);
    private P2_PrinterHead p2 = new P2_PrinterHead(2);
    private P2_PrinterHead p3 = new P2_PrinterHead(3);

    public P2_Printer() 
    {
        //Nothing to set up.
        printerHeadsWaiting.add(p1);
        printerHeadsWaiting.add(p2);
        printerHeadsWaiting.add(p3);
    }

    public synchronized P2_PrinterHead requestHead()
    {
        while(printerHeadsWaiting.size()==0)
        {
            //If there isn't a head available, pause for a moment and check again.
            try
            {
                Thread.sleep(0);
            }
            catch(Exception e)
            {
                //Don't caare
            }
        }
        return printerHeadsWaiting.removeFirst();
    }

    public boolean requestPrint(P2_Jobs jobInput, P2_PrinterHead printHeadToUse)
    {
        printHeadToUse.print(jobInput, time);
        printerHeadsWaiting.add(printHeadToUse);
        return true;
    }

}