Package cambio.simulator.resources.cpu.scheduling

Class FIFOScheduler

java.lang.Object
cambio.simulator.resources.cpu.scheduling.CPUProcessScheduler
cambio.simulator.resources.cpu.scheduling.FIFOScheduler
public class FIFOScheduler extends CPUProcessScheduler
First in first out scheduler.

Schedules all entered processes in the same order that they arrived in. Always assigns the full work demand needed for a processes.

Author:
Lion Wagner

  • Constructor Details

    • FIFOScheduler

      public FIFOScheduler(String name)

  • Method Details

    • enterProcess

      public void enterProcess(CPUProcess process)
      Enters the process into the scheduling queue.
      Specified by:
      enterProcess in class CPUProcessScheduler
      Parameters:
      process - Process that is to be scheduled
      See Also:

    • retrieveNextProcess

      public org.javatuples.Pair<CPUProcess,Integer> retrieveNextProcess()
      Pulls the next Process to handle and how much demand should be accomplished.
      Specified by:
      retrieveNextProcess in class CPUProcessScheduler
      Returns:
      a pair containing the next process to handle and how much demand should be accomplished.
      See Also:

    • retrieveNextProcessNoReschedule

      public org.javatuples.Pair<CPUProcess,Integer> retrieveNextProcessNoReschedule()
      Pulls the next Process to handle and its assigned time/work quantum.
      Prevents automatic rescheduling of the process like in round-robin scheduling.

      This method is used to offer scheduling for multithreading.

      Specified by:
      retrieveNextProcessNoReschedule in class CPUProcessScheduler
      Returns:
      a pair containing the next process to handle and its assigned time quantum.
      See Also:

    • hasProcessesToSchedule

      public boolean hasProcessesToSchedule()
      Checks whether this scheduler currently has processes ready to be retrieved from scheduling.
      Specified by:
      hasProcessesToSchedule in class CPUProcessScheduler
      Returns:
      true if there is a process ready to schedule, false otherwise

    • getTotalWorkDemand

      public int getTotalWorkDemand()
      Calculates the sum of all scheduled process's demand remainders.
      Specified by:
      getTotalWorkDemand in class CPUProcessScheduler
      Returns:
      the sum of the demand remainder of all processes that are currently in queue.

    • clear

      public void clear()
      Clears all current processes from the scheduler.
      Specified by:
      clear in class CPUProcessScheduler

    • size

      public int size()
      Counts the amount of processes that are currently scheduled.
      Specified by:
      size in class CPUProcessScheduler
      Returns:
      the amount of processes that are currently scheduled.