processschedule.java

进程调度和存储管理模拟

package cn.edu.cauc.crab.ossimulate;

import java.util.*;

/**
 * <p>Title: OS simulate</p>
 * <p>Description: This is my home work.</p>
 * <p>Copyright: Copyleft (c) 2004</p>
 * <p>Company: CAUC</p>
 * @author Crab
 * @version 0.1
 */

/**
 * PCB for scheduling.
 * just use for scheduling.
 *
 * @author Crab
 * @version 0.1
 */
class PCB {
    //init when the process arrive
    Process process;
    int pid;
    int arriveTime;// when process add to queue.
    int serveTime;// the cpu time process need.
    int leftTime;// left how long the process will end.

    int beginTime;// when process beging to work.
    int finishTime;// process finish the work.
    int rollTime;// = finishTime - arriveTime
    float nullWorkRate;// = rollTime / serveTime

    //for responsibility
    int waitTime;
    float responsibility = 0;// = (waitTime + serveTime) / serveTime
}


/**
 * To simulate process scheduling.
 *
 * @author Crab
 * @version 0.1
 */
abstract public class ProcessSchedule {

    List PCBs;// pcb container
    int pid = 0;

    public ProcessSchedule() {
        PCBs = new LinkedList();
    }

    public void addProcess(Process process, int arriveTime) {
        PCB pcb = new PCB();
        pcb.process = process;
        pcb.pid = pid++;
        pcb.arriveTime = arriveTime;
        pcb.serveTime = process.getTime();
        pcb.leftTime = pcb.serveTime;
        PCBs.add(pcb);
    }

    abstract public void start();

    /*
    //For the Unit test.
    public static void main(String[] args) {
        ProcessSchedule pSch = new ProcessSchedule();
        pSch.addProcess(new Process(10), 5);
        PCB pcb = (PCB)pSch.PCBs.get(0);
        System.out.println(pcb.arriveTime);
    }
    */
}