tp2.FCFS.java Source code

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Here is the source code for tp2.FCFS.java

Source

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package tp2;

import java.awt.BasicStroke;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.ChartFactory;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import java.io.File;
import java.io.IOException;
import static java.lang.Math.abs;
import java.util.logging.Level;
import java.util.logging.Logger;

public class FCFS implements DiskScheduler {
    private int[] requestString;
    private int numCilindros;
    private int initCilindro;

    public FCFS(int[] requestString, int numCilindros, int initCilindro) {
        this.requestString = requestString;
        this.numCilindros = numCilindros;
        this.initCilindro = initCilindro;
    }

    @Override
    public int serviceRequests() {
        int total = 0, i;

        /* Determine o nmero de cilindros percorridos pelo cabeote de leitura
           para o algoritmo FCFS. */
        total = abs(initCilindro - requestString[0]);

        for (i = 0; i < requestString.length - 1; i++) {
            total += abs(requestString[i] - requestString[i + 1]);
        }

        return total;
    }

    @Override
    public void printGraph(String filename) {
        int i;
        int y_axis = requestString.length * 10;

        XYSeries series = new XYSeries("FCFS");

        /* Adiciona o pontos XY do grfico de linhas. */
        series.add(y_axis, initCilindro);

        for (i = 0; i < requestString.length; i++) {
            series.add(y_axis - ((i + 1) * 10), requestString[i]);
        }

        /* Adiciona a serie criada a um SeriesCollection. */
        XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(series);

        /* Gera o grfico de linhas */
        JFreeChart chart = ChartFactory.createXYLineChart(
                /* Title */
                "FCFS Scheduler Algorithm",
                /* Title x*/
                "",
                /* Title y */
                "Cilindro", dataset,
                /* Plot Orientation */
                PlotOrientation.HORIZONTAL,
                /* Show Legend */
                false,
                /* Use tooltips */
                false,
                /* Configure chart to generate URLs? */
                false);

        /* Configura a espessura da linha do grfico  */
        XYPlot plot = chart.getXYPlot();

        XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
        renderer.setSeriesStroke(0, new BasicStroke(4.0f));
        plot.setRenderer(renderer);

        /* Escreve o grfico para um arquivo indicado. */
        try {
            ChartUtilities.saveChartAsJPEG(new File(filename), chart, 500, 300);
        } catch (IOException ex) {
            Logger.getLogger(FCFS.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

}