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/*******************************************************************************
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* FCFSScheduler.java
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*
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* This file holds the implementation of the First Come First Serve Scheduler
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* class.
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*
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* Copyright (c) 2006, Ira W. Snyder (devel@irasnyder.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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******************************************************************************/
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import java.util.*;
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import java.lang.ClassCastException;
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class FCFSScheduler implements Scheduler
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{
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private class FCFSProcess implements Comparable
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{
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public final Process proc;
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public final int add_time;
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public FCFSProcess (Process proc, int add_time)
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{
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this.proc = proc;
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this.add_time = add_time;
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}
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// negative if this < rhs
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// positive if this > rhs
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public int compareTo (Object o)
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{
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if (! (o instanceof FCFSProcess))
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throw new ClassCastException();
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FCFSProcess rhs = (FCFSProcess)o;
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return this.add_time - rhs.add_time;
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}
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}
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private Vector<FCFSProcess> processes;
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public FCFSScheduler ()
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{
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processes = new Vector<FCFSProcess> ();
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}
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public void addProcess (Process proc, int add_time)
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{
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processes.add (new FCFSProcess (proc, add_time));
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}
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public void run ()
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{
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int starttime = 0;
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int endtime = 0;
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/* Sort the process list by time added */
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Collections.sort (processes);
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for (FCFSProcess p : processes)
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{
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endtime = starttime + p.proc.timeslice;
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System.out.printf ("%s start=%d end=%d\n", p.proc.name, starttime, endtime-1);
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starttime = endtime;
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}
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}
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}
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/* vim: set ts=4 sts=4 sw=4 expandtab: */
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