/** Process.java - For each process/job/task in our schedule, we want
 *  to keep track of its name, arrival time, total execution time required.
 *  It would also be desirable to keep track of how much time is left
 *  before the task is finished.
 *  Also, the startTime and doneTime attributes will be useful when we
 *  want to know the response time of a process.
 */
public class Process
{
  private String name;
  private int arrivalTime;
  private int execTime;
  private int timeLeft;
  private int startTime;
  private int doneTime;

  public Process(String n, int start, int howLong)
  {
    name = n;
    arrivalTime = start;
    execTime = howLong;
    timeLeft = execTime;
  }

  // In case we want to start over, here's a way to re-set runtime params.
  public void reset()
  {
    timeLeft = execTime;
    startTime = doneTime = 0;
  }

  public String toString()
  {
    return "Process " + name + " arrives " + arrivalTime + ", requires " +
           execTime + ", " + timeLeft + " remaining :: startTime = " +
	         startTime + ", doneTime = " + doneTime;
  }

  // It would be useful to have a number of get/set functions, plus
  // a way to reduce the amount of "time left" and a way to tell if we
  // are finished with a job.

  public String getName()
  {
    return name;
  }

  public int getArrivalTime()
  {
    return arrivalTime;
  }

  public int getExecTime()
  {
    return execTime;
  }

  public int getTimeLeft()
  {
    return timeLeft;
  }

  public void setTimeLeft(int howLong)
  {
    timeLeft = howLong;
  }

  public void reduceTimeLeft(int howLong)
  {
    timeLeft -= howLong;
  }

  public boolean isDone()
  {
    return timeLeft <= 0;
  }

  public void setStartTime(int when)
  {
    startTime = when;
  }

  public void setDoneTime(int when)
  {
    doneTime = when;
  }

  // Watch out:  response time is done - arrival, not done - start !
  public int findResponseTime()
  {
    return doneTime - startTime;
  }

  // Tell this process that it is finished (useful for shortest-job-next)
  public void makeDone()
  {
    timeLeft = 0;
  }
}