Subversion Repositories programming

/*******************************************************************************
 * FCFSScheduler.java
 *
 * This file holds the implementation of the First Come First Serve Scheduler
 * class.
 *
 * Copyright (c) 2006, Ira W. Snyder (devel@irasnyder.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 ******************************************************************************/

import java.util.*;
import java.lang.ClassCastException;

class FCFSScheduler implements Scheduler
{
    private class FCFSProcess implements Comparable
    {
        public final Process proc;
        public final int add_time;

        public FCFSProcess (Process proc, int add_time)
        {
            this.proc = proc;
            this.add_time = add_time;
        }

        // negative if this < rhs
        // positive if this > rhs
        public int compareTo (Object o)
        {
            if (! (o instanceof FCFSProcess))
                throw new ClassCastException();

            FCFSProcess rhs = (FCFSProcess)o;

            return this.add_time - rhs.add_time;
        }
    }

    private Vector<FCFSProcess> processes;

    public FCFSScheduler ()
    {
        processes = new Vector<FCFSProcess> ();
    }

    public void addProcess (Process proc, int add_time)
    {
        processes.add (new FCFSProcess (proc, add_time));
    }


    public void run ()
    {
        int starttime = 0;
        int endtime = 0;

        /* Sort the process list by time added */
        Collections.sort (processes);

        for (FCFSProcess p : processes)
        {
            endtime = starttime + p.proc.timeslice;
            System.out.printf ("%s start=%d end=%d\n", p.proc.name, starttime, endtime-1);
            starttime = endtime;
        }
    }
}

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