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DiskScheduling.java
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DiskScheduling.java
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import javax.swing.*;
import java.awt.*;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Collections;
public class DiskScheduling {
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
JFrame frame = new JFrame();
frame.setTitle("Disk Scheduling");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setLayout(new GridBagLayout());
panel.setBackground(Color.WHITE);
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.insets = new Insets(0, 10, 10, 10);
JLabel title = new JLabel("Disk Scheduling");
title.setFont(new Font("Century Gothic", Font.BOLD, 25));
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 3;
panel.add(title, c);
JLabel valueLabel = new JLabel("Value: (1 to 200, space-separated)");
valueLabel.setFont(new Font("Century Gothic", Font.PLAIN, 16));
c.gridy = 1;
c.gridwidth = 1;
panel.add(valueLabel, c);
JTextArea valueTextArea = new JTextArea();
valueTextArea.setFont(new Font("Century Gothic", Font.PLAIN, 16));
valueTextArea.setRows(3);
valueTextArea.setColumns(20);
JScrollPane scrollPane = new JScrollPane(valueTextArea);
c.gridy = 2;
panel.add(scrollPane, c);
JLabel algoLabel = new JLabel("Choose Algorithm:");
algoLabel.setFont(new Font("Century Gothic", Font.PLAIN, 16));
c.gridy = 3;
panel.add(algoLabel, c);
String[] algorithms = {"FIFO", "SSTF", "SCAN", "CSCAN"};
JComboBox<String> algoComboBox = new JComboBox<>(algorithms);
algoComboBox.setFont(new Font("Century Gothic", Font.PLAIN, 12));
c.gridy = 4;
panel.add(algoComboBox, c);
JLabel directionLabel = new JLabel("Initial direction:");
directionLabel.setFont(new Font("Century Gothic", Font.PLAIN, 16));
c.gridy = 5;
panel.add(directionLabel, c);
String[] directions = {"LEFT", "RIGHT"};
JComboBox<String> dirComboBox = new JComboBox<>(directions);
dirComboBox.setFont(new Font("Century Gothic", Font.PLAIN, 12));
c.gridy = 6;
panel.add(dirComboBox, c);
JLabel positionLabel = new JLabel("Head position:");
positionLabel.setFont(new Font("Century Gothic", Font.PLAIN, 16));
c.gridy = 7;
panel.add(positionLabel, c);
JTextField positionTextField = new JTextField();
positionTextField.setFont(new Font("Century Gothic", Font.PLAIN, 16));
c.gridy = 8;
panel.add(positionTextField, c);
JButton visualizeButton = new JButton("Visualize");
visualizeButton.setFont(new Font("Century Gothic", Font.PLAIN, 12));
c.gridy = 9;
panel.add(visualizeButton, c);
frame.getContentPane().add(panel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
visualizeButton.addActionListener(e -> {
String requestArr = valueTextArea.getText();
String option1 = (String) algoComboBox.getSelectedItem();
String option2 = (String) dirComboBox.getSelectedItem();
int start = Integer.parseInt(positionTextField.getText());
visualize(requestArr, option1, option2, start);
});
});
}
public static int TotalSeekTime(ArrayList<Integer> order) {
int sum = 0;
for (int i = 1; i < order.size(); i++) {
sum+= Math.abs(order.get(i - 1) - order.get(i));
}
return sum;
}
public static ArrayList<Integer> FIFO(ArrayList<Integer> request, int start) {
ArrayList<Integer> order = new ArrayList<>(request);
order.add(0, start);
return order;
}
public static ArrayList<Integer> SSTF(ArrayList<Integer> request, int start) {
int position = start;
ArrayList<Integer> tempRequest = new ArrayList<>(request);
ArrayList<Integer> order = new ArrayList<>();
order.add(position);
while (!tempRequest.isEmpty()) {
int diff = 200;
int newPosition = position;
for (int i = 0; i < tempRequest.size(); i++) {
if (diff > Math.abs(tempRequest.get(i) - position)) {
diff = Math.abs(tempRequest.get(i) - position);
newPosition = tempRequest.get(i);
}
}
position = newPosition;
order.add(position);
tempRequest.remove(Integer.valueOf(position));
}
return order;
}
public static ArrayList<Integer> SCAN(ArrayList<Integer> request, int start, String direction) {
ArrayList<Integer> tempRequest = new ArrayList<>(request);
ArrayList<Integer> order = new ArrayList<>();
tempRequest.add(start);
Collections.sort(tempRequest);
int idx = tempRequest.indexOf(start);
if (direction.equals("RIGHT")) {
for (int i = idx; i < tempRequest.size(); i++) {
order.add(tempRequest.get(i));
}
for (int i = idx - 1; i >= 0; i--) {
order.add(tempRequest.get(i));
}
} else if (direction.equals("LEFT")) {
for (int i = idx; i >= 0; i--) {
order.add(tempRequest.get(i));
}
for (int i = idx + 1; i < tempRequest.size(); i++) {
order.add(tempRequest.get(i));
}
}
return order;
}
public static ArrayList<Integer> CSCAN(ArrayList<Integer> request, int start, String direction) {
ArrayList<Integer> tempRequest = new ArrayList<>(request);
ArrayList<Integer> order = new ArrayList<>();
tempRequest.add(start);
Collections.sort(tempRequest);
int idx = tempRequest.indexOf(start);
if (direction.equals("RIGHT")) {
for (int i = idx; i < tempRequest.size(); i++) {
order.add(tempRequest.get(i));
}
for (int i = 0; i < idx; i++) {
order.add(tempRequest.get(i));
}
} else if (direction.equals("LEFT")) {
for (int i = idx; i >= 0; i--) {
order.add(tempRequest.get(i));
}
for (int i = tempRequest.size() - 1; i > idx; i--) {
order.add(tempRequest.get(i));
}
}
return order;
}
public static void visualize(String request, String option1, String option2, int start) {
String[] requestArrStrings = request.split(" ");
ArrayList<Integer> requestArr = new ArrayList<>();
for (String s : requestArrStrings) {
requestArr.add(Integer.parseInt(s));
}
final ArrayList<Integer> order;
if (option1.equals("FIFO")) {
order = FIFO(requestArr, start);
} else if (option1.equals("SSTF")) {
order = SSTF(requestArr, start);
} else if (option1.equals("SCAN")) {
order = SCAN(requestArr, start, option2);
} else if (option1.equals("CSCAN")) {
order = CSCAN(requestArr, start, option2);
} else {
return;
}
EventQueue.invokeLater(() -> {
JFrame frame = new JFrame();
frame.setTitle(option1);
frame.getContentPane().add(new LineChart(order));
frame.pack();
frame.setVisible(true);
});
}
}
class LineChart extends JPanel {
private static final int WIDTH = 620;
private static final int HEIGHT = 380;
private ArrayList<Integer> order;
public LineChart(ArrayList<Integer> order) {
this.order = order;
setPreferredSize(new Dimension(WIDTH, HEIGHT));
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
int padding = 30;
int graphWidth = WIDTH - 2 * padding;
int graphHeight = HEIGHT - 2 * padding - 20;
g.drawLine(padding, padding, padding + graphWidth, padding);
g.drawLine(padding, padding, padding, padding + graphHeight);
g.setColor(Color.BLACK);
g.setFont(new Font("Arial", Font.PLAIN, 12));
int gapX = graphWidth / 40;
for (int i = 0; i <= 4; i++) {
int x = padding + i * (graphWidth / 4);
int labelLength = String.valueOf(i * 50).length();
if (labelLength < 3) {
g.drawString(String.valueOf(i * 50), x - (labelLength == 1? 2: 6), padding - 5);
} else {
g.drawString(String.valueOf(i * 50), x - (3 + 2 * labelLength), padding - 5);
}
if (i < 4) {
for (int j = 1; j <= 10; j++) {
g.drawLine(x + gapX * j, padding, x + gapX * j, padding + 5 * (j % 5 == 0? 2: 1));
}
}
}
int gapY = graphHeight / (order.size() - 1);
for (int i = 0; i <= order.size() - 1; i++) {
int y = padding + i * (graphHeight / (order.size() - 1));
int labelLength = String.valueOf(i).length();
g.drawString(String.valueOf(i), padding - (3 + 7 * labelLength), y + 5);
g.drawLine(padding, y, padding + 10, y);
}
g.drawString("Total seek time: " + DiskScheduling.TotalSeekTime(order), padding, padding + graphHeight + 25);
g.setColor(Color.RED);
for (int i = 0; i < order.size() - 1; i++) {
int x1 = padding + order.get(i) * gapX / 5;
int y1 = padding + i * gapY;
int x2 = padding + order.get(i + 1) * gapX / 5;
int y2 = padding + (i + 1) * gapY;
g.drawLine(x1, y1, x2, y2);
}
Graphics2D g2d = (Graphics2D) g;
Stroke dashed = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0, new float[]{2}, 0);
g2d.setStroke(dashed);
for (int i = 0; i < order.size() - 1; i++) {
int x1 = padding + order.get(i + 1) * gapX / 5;
int y1 = padding;
int x2 = x1;
int y2 = padding + (i + 1) * gapY;
g2d.drawLine(x1, y1, x2, y2);
}
}
}