1 |
/* |
2 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
* Expert Group and released to the public domain, as explained at |
4 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
*/ |
6 |
|
7 |
import java.awt.*; |
8 |
import java.awt.event.*; |
9 |
import java.util.*; |
10 |
import java.util.concurrent.*; |
11 |
import javax.swing.*; |
12 |
import javax.swing.event.*; |
13 |
|
14 |
/** |
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* Microscope implements a version of the 7th Guest |
16 |
* game found looking in the Microscope in the laboratory. |
17 |
* See <a href="http://gee.cs.oswego.edu/dl/applets/micro.html"> |
18 |
* Microscope</a> version for instructions. |
19 |
* <p> |
20 |
* The code has been mangled beyond recognition |
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* as a test of ForkJoin. |
22 |
*/ |
23 |
public class Microscope extends JPanel { |
24 |
|
25 |
static final CountDownLatch cd = new CountDownLatch(1); |
26 |
/* |
27 |
* If true, the move finder uses a repeatable evaluation |
28 |
* strategy, so all self-play games at same level have same outcome. |
29 |
* This is useful for testing purposes, but much less fun to watch. |
30 |
*/ |
31 |
|
32 |
static boolean DETERMINISTIC = false; |
33 |
|
34 |
static boolean headless = false; |
35 |
|
36 |
// Command-line parameters |
37 |
|
38 |
static int nprocs; |
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static int lookAheads = 4; |
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static boolean autostart = true; |
41 |
static ForkJoinPool group; |
42 |
static long startTime; |
43 |
|
44 |
public static void main(String[] args) throws Exception { |
45 |
nprocs = 0; |
46 |
try { |
47 |
if (args.length > 0) { |
48 |
nprocs = Integer.parseInt(args[0]); |
49 |
autostart = false; |
50 |
if (args.length > 1) { |
51 |
autostart = true; |
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lookAheads = Integer.parseInt(args[1]); |
53 |
DETERMINISTIC = true; |
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} |
55 |
} |
56 |
} |
57 |
catch (Exception e) { |
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System.out.println("Usage: java Microscope <threads> [<level>]"); |
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return; |
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} |
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group = nprocs == 0 ? new ForkJoinPool() : new ForkJoinPool(nprocs); |
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startTime = System.currentTimeMillis(); |
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System.out.print("Score: "); |
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oneRun(); |
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cd.await(); |
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long now = System.currentTimeMillis(); |
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System.out.println(); |
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System.out.println("time: " + (now - startTime) + "ms"); |
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System.out.println(group.toString()); |
70 |
System.exit(0); |
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} |
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|
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static void onExit() { |
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long now = System.currentTimeMillis(); |
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System.out.println("time: " + (now - startTime) + "ms"); |
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System.out.println(group.toString()); |
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System.exit(0); |
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} |
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|
80 |
static void oneRun() { |
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if (java.awt.GraphicsEnvironment.isHeadless()) { |
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headless = true; |
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Microscope t = new Microscope(); |
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t.init(); |
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} |
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else { |
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JFrame frame = new JFrame(); |
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frame.addWindowListener(new WindowAdapter() { |
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public void windowClosing(WindowEvent e) {onExit();}}); |
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|
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Microscope t = new Microscope(); |
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frame.setSize(new Dimension(400, 400)); |
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frame.getContentPane().add(t); |
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// frame.pack(); |
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frame.setVisible(true); |
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t.init(); |
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} |
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} |
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|
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// representations: |
101 |
|
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Board board = new Board(); // The current board representation |
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|
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synchronized Board getBoard() { return board; } |
105 |
synchronized void setBoard(Board b) { |
106 |
board = b; |
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System.out.print(b.score(player) + " "); |
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if (boardPanel != null) |
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boardPanel.repaint(); |
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} |
111 |
|
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Player player = Player.Blue; // current player (BLUE, GREEN) |
113 |
|
114 |
synchronized Player getPlayer() { return player; } |
115 |
synchronized void setPlayer(Player p) { player = p; } |
116 |
|
117 |
final AutoMover auto; // The move finder. |
118 |
final User user; // Mover for user moves |
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Mover mover = null; // the current Mover (always == auto or user or null) |
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|
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synchronized Mover getMover() { return mover; } |
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synchronized void setMover(Mover m) { mover = m; } |
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synchronized boolean isMoving() { return mover != null; } |
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|
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Vector<Move> history = new Vector<Move>(); // List of completed moves; |
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|
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boolean demoMode = true; |
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synchronized boolean getDemoMode() { return demoMode; } |
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synchronized void setDemoMode(boolean b) { demoMode = b; } |
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synchronized boolean toggleDemoMode() { return demoMode = !demoMode; } |
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|
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final BoardPanel boardPanel; |
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|
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JLabel scoreLabel; |
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JButton autoButton; |
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JButton undoButton; |
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JButton modeButton; |
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JSlider levelSlider; |
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|
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public Microscope() { |
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if (headless) { |
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boardPanel = null; |
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auto = new AutoMover(this); |
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user = new User(this); |
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return; |
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} |
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boardPanel = new BoardPanel(); |
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scoreLabel = new JLabel("Score: 0"); |
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autoButton = new JButton(" Start "); |
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undoButton = new JButton("Undo"); |
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modeButton = new JButton("Demo mode"); |
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levelSlider = new JSlider(JSlider.VERTICAL, 2, 6, lookAheads); |
153 |
|
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auto = new AutoMover(this); |
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user = new User(this); |
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|
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JPanel topPanel = new JPanel(); |
158 |
autoButton.addActionListener(new ActionListener() { |
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public void actionPerformed(ActionEvent e) { |
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if (!isMoving()) { |
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startMover(auto); |
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autoButton.setText("Cancel"); |
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} |
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else { |
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stopMover(); |
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if (getDemoMode()) |
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autoButton.setText(" Start "); |
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else |
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autoButton.setText(" Find "); |
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} |
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}}); |
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|
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modeButton.addActionListener(new ActionListener() { |
174 |
public synchronized void actionPerformed(ActionEvent e) { |
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toggleDemoMode(); |
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updateStatus(); |
177 |
}}); |
178 |
|
179 |
undoButton.addActionListener(new ActionListener() { |
180 |
public void actionPerformed(ActionEvent e) { |
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undo(); |
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}}); |
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|
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levelSlider.addChangeListener(new ChangeListener() { |
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public void stateChanged(ChangeEvent e) { |
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setLevel(((JSlider)(e.getSource())).getValue()); |
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}}); |
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|
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// Dimension labDim = new Dimension(40, 16); |
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// Dimension labDim = new Dimension(72, 24); |
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// scoreLabel.setMinimumSize(labDim); |
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// scoreLabel.setPreferredSize(labDim); |
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|
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topPanel.add(autoButton); |
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topPanel.add(modeButton); |
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topPanel.add(undoButton); |
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topPanel.add(scoreLabel); |
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add(topPanel); |
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|
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levelSlider.setLabelTable(levelSlider.createStandardLabels(1)); |
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levelSlider.setPaintLabels(true); |
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|
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JPanel botPanel = new JPanel(); |
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|
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botPanel.add(boardPanel); |
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JPanel sliderPanel = new JPanel(); |
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sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.Y_AXIS)); |
208 |
sliderPanel.add(levelSlider); |
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sliderPanel.add(new JLabel("Level")); |
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|
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botPanel.add(sliderPanel); |
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|
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add(botPanel); |
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} |
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|
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void initializeBoard() { |
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board.reset(); |
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board.occupy(Player.Blue, 0, 0); |
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board.occupy(Player.Blue, Board.RANKS-1, Board.RANKS-1); |
220 |
board.occupy(Player.Green, 0, Board.RANKS-1); |
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board.occupy(Player.Green, Board.RANKS-1, 0); |
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setPlayer(Player.Blue); |
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if (boardPanel != null) |
224 |
boardPanel.repaint(); |
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} |
226 |
|
227 |
public void init() { |
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initializeBoard(); |
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if (autostart) { |
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startMover(auto); |
231 |
} |
232 |
} |
233 |
|
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synchronized void setLevel(int l) { |
235 |
lookAheads = l; |
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if (lookAheads <= 1) lookAheads = 2; |
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} |
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|
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public int level() { return Microscope.lookAheads; } |
240 |
|
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// process a move (called only from mover) |
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public void move(Move m, Mover mvr) { |
243 |
if (mvr != mover || |
244 |
m == null || |
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(mvr == user && !m.isLegal())) { |
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setMover(null); |
247 |
if (mvr == auto && autostart) { |
248 |
cd.countDown(); |
249 |
return; // System.exit(0); |
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} |
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} |
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else { |
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m.commit(); |
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setBoard(m.board()); |
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setPlayer(m.player().opponent()); |
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|
257 |
history.addElement(m); |
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|
259 |
if (mvr == auto && |
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getDemoMode() && |
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!m.isPass()) { |
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if (getBoard().gameOver()) { |
263 |
if (autostart) { |
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cd.countDown(); |
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return; // System.exit(0); |
266 |
} |
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else |
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setMover(null); |
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} |
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else { |
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auto.startTurn(new Board(getBoard()), getPlayer()); |
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} |
273 |
} |
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else { |
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setMover(null); |
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} |
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} |
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} |
279 |
|
280 |
// start up a Mover |
281 |
void startMover(Mover m) { |
282 |
Mover mvr = getMover(); |
283 |
if (mvr == null) { |
284 |
setMover(m); |
285 |
m.startTurn(new Board(getBoard()), player); |
286 |
} |
287 |
} |
288 |
|
289 |
// stop current Mover |
290 |
void stopMover() { |
291 |
Mover mvr = getMover(); |
292 |
if (mvr != null) { |
293 |
setMover(null); |
294 |
mvr.cancel(); |
295 |
} |
296 |
} |
297 |
|
298 |
// handle Undo button |
299 |
synchronized void undo() { |
300 |
if (mover == null) { |
301 |
if (history.size() > 1) { |
302 |
history.removeElementAt(history.size()-1); |
303 |
Move m = history.lastElement(); |
304 |
setPlayer(m.player().opponent()); |
305 |
setBoard(m.board()); |
306 |
} |
307 |
else if (history.size() == 1) { |
308 |
history.removeAllElements(); |
309 |
initializeBoard(); |
310 |
} |
311 |
} |
312 |
} |
313 |
|
314 |
// handle click on tile |
315 |
void userMove(int row, int col) { |
316 |
startMover(user); |
317 |
user.choose(row, col); |
318 |
} |
319 |
|
320 |
void updateStatus() { // normally called from board update |
321 |
Player p = getPlayer(); |
322 |
int s = getBoard().score(p); |
323 |
if (scoreLabel == null) { |
324 |
System.out.print(s + " "); |
325 |
return; |
326 |
} |
327 |
|
328 |
scoreLabel.setForeground(displayColor(p)); |
329 |
scoreLabel.setText("Score: " + s); |
330 |
|
331 |
if (getDemoMode()) |
332 |
modeButton.setText("Demo mode"); |
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else { |
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if (getPlayer().isBlue()) |
335 |
modeButton.setText("Blue turn"); |
336 |
else |
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modeButton.setText("Green turn"); |
338 |
} |
339 |
|
340 |
} |
341 |
|
342 |
static final int CELL_SIZE = 40; // size of a tile/cell |
343 |
|
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static final Color paleGreen = new Color(152, 251, 152); |
345 |
static final Color darkGreen = new Color(60, 179, 113); |
346 |
|
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static final Color possibleMoveColor = Color.yellow; |
348 |
|
349 |
public static Color displayColor(Player pl) { |
350 |
if (pl.isBlue()) return Color.blue; |
351 |
else if (pl.isGreen()) return darkGreen; |
352 |
else return Color.white; |
353 |
} |
354 |
|
355 |
public static Color lightDisplayColor(Player pl) { |
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if (pl.isBlue()) return Color.cyan; |
357 |
else if (pl.isGreen()) return paleGreen; |
358 |
else return Color.gray; |
359 |
} |
360 |
|
361 |
class BoardPanel extends Canvas implements MouseListener { |
362 |
|
363 |
BoardPanel() { |
364 |
setSize(new Dimension(Board.RANKS * CELL_SIZE + 5, |
365 |
Board.RANKS * CELL_SIZE + 5)); |
366 |
addMouseListener(BoardPanel.this); |
367 |
} |
368 |
|
369 |
public void paint(Graphics g) { |
370 |
|
371 |
Board b = getBoard(); |
372 |
Player p = getPlayer(); |
373 |
|
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// the cells |
375 |
for (int row = 0; row < Board.RANKS; row++) { |
376 |
for (int col = 0; col < Board.RANKS; col++) { |
377 |
|
378 |
// Highlight selected tile and legal destinations |
379 |
if (user.placing()) { |
380 |
if (user.hasMovedFrom(row, col)) |
381 |
g.setColor(lightDisplayColor(p)); |
382 |
else if (user.canMoveTo(row, col)) |
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g.setColor(possibleMoveColor); |
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else |
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g.setColor(displayColor(b.occupant(row, col))); |
386 |
} |
387 |
|
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else |
389 |
g.setColor(displayColor(b.occupant(row, col))); |
390 |
|
391 |
// tiles are just filled rectangles |
392 |
g.fillRect(row * CELL_SIZE, col * CELL_SIZE, CELL_SIZE, CELL_SIZE); |
393 |
} |
394 |
} |
395 |
|
396 |
// the grid over the cells |
397 |
g.setColor(Color.black); |
398 |
for ( int i = 0; i <= Board.RANKS; i++) { |
399 |
g.drawLine(0, i * CELL_SIZE, Board.RANKS * CELL_SIZE, i * CELL_SIZE); |
400 |
g.drawLine(i * CELL_SIZE, 0, i * CELL_SIZE, Board.RANKS * CELL_SIZE); |
401 |
} |
402 |
|
403 |
updateStatus(); |
404 |
} |
405 |
|
406 |
public void mouseReleased(MouseEvent evt) { |
407 |
|
408 |
int x = evt.getX(); |
409 |
int y = evt.getY(); |
410 |
|
411 |
int row = x / CELL_SIZE; |
412 |
int col = y / CELL_SIZE; |
413 |
|
414 |
if (Board.inBounds(row, col)) { // cell selection |
415 |
userMove(row, col); |
416 |
repaint(); |
417 |
} |
418 |
} |
419 |
|
420 |
public void mouseClicked(MouseEvent e) {} |
421 |
public void mousePressed(MouseEvent e) {} |
422 |
public void mouseEntered(MouseEvent e) {} |
423 |
public void mouseExited(MouseEvent e) {} |
424 |
} |
425 |
|
426 |
/** |
427 |
* Player is just a glorified enumeration |
428 |
*/ |
429 |
static final class Player { |
430 |
|
431 |
public static final int EMPTY = 0; |
432 |
public static final int BLUE = 1; |
433 |
public static final int GREEN = 2; |
434 |
public static final int ILLEGAL_PLAYER_VALUE = 3; |
435 |
|
436 |
public static final Player Empty = new Player(EMPTY); |
437 |
public static final Player Blue = new Player(BLUE); |
438 |
public static final Player Green = new Player(GREEN); |
439 |
public static final Player Illegal = new Player(ILLEGAL_PLAYER_VALUE); |
440 |
|
441 |
/* private */ int code_; |
442 |
|
443 |
public Player(int code) { code_ = code; } |
444 |
public Player(Player p) { code_ = p.code_; } |
445 |
|
446 |
public boolean same(Player p) { return code_ == p.code_; } |
447 |
|
448 |
public boolean isEmpty() { return code_ == EMPTY; } |
449 |
public boolean isBlue() { return code_ == BLUE; } |
450 |
public boolean isGreen() { return code_ == GREEN; } |
451 |
public boolean isLegal() { return code_ <= GREEN; } |
452 |
|
453 |
public Player opponent() { |
454 |
if (code_ == GREEN) return Blue; |
455 |
else if (code_ == BLUE) return Green; |
456 |
else return Illegal; |
457 |
} |
458 |
|
459 |
} |
460 |
|
461 |
/** |
462 |
* Board configurations are represented by bit vectors. |
463 |
* Since there are only 49 cells, the bits can be held in `longs', |
464 |
* one for each player. |
465 |
* <p> |
466 |
* Boards are not immutable, but are never passed around across |
467 |
* threads (instead new ones are constructed), so don't |
468 |
* need any synch. |
469 |
*/ |
470 |
static final class Board { |
471 |
|
472 |
/* |
473 |
First, some Constants and utilities that might as well be here |
474 |
*/ |
475 |
|
476 |
public static final int RANKS = 7; |
477 |
public static final int CELLS = RANKS * RANKS; |
478 |
|
479 |
static final long FULL = (1L << CELLS) - 1; |
480 |
|
481 |
// The finder uses a spare bit to remember whose move it is. |
482 |
static final long BLUEBIT = (1L << CELLS); |
483 |
|
484 |
// Bits representing the adjacent cells for every position |
485 |
static final long[] adjacentMasks = new long[CELLS]; |
486 |
|
487 |
// bit pattern associated with each tile |
488 |
static final long[] cellBits = new long[CELLS]; |
489 |
|
490 |
// locations of all cells reachable by a jump for every position |
491 |
static final byte[][] jumpDestinations = new byte[CELLS][]; |
492 |
|
493 |
// initialize tables |
494 |
static { |
495 |
byte[] dests = new byte[CELLS]; |
496 |
for (int j = 0; j < RANKS; ++j) { |
497 |
for (int i = 0; i < RANKS; ++i) { |
498 |
int k = i + j * RANKS; |
499 |
long nmask = 0; |
500 |
int jumpCount = 0; |
501 |
for (int c = j-2; c <= j+2; ++c) { |
502 |
for (int r = i-2; r <= i+2; ++r) { |
503 |
if (c >= 0 && c < RANKS && |
504 |
r >= 0 && r < RANKS) { |
505 |
int cellIndex = r + c * RANKS; |
506 |
if (r == i-2 || r == i+2 || c == j-2 || c == j+2) { |
507 |
dests[jumpCount++] = (byte)cellIndex; |
508 |
} |
509 |
else if (!(r == i && c == j)) { |
510 |
nmask |= 1L << cellIndex; |
511 |
} |
512 |
} |
513 |
} |
514 |
} |
515 |
adjacentMasks[k] = nmask; |
516 |
cellBits[k] = 1L << k; |
517 |
jumpDestinations[k] = new byte[jumpCount]; |
518 |
for (int l = 0; l < jumpCount; ++l) |
519 |
jumpDestinations[k][l] = dests[l]; |
520 |
|
521 |
} |
522 |
} |
523 |
|
524 |
} |
525 |
|
526 |
public static boolean inBounds(int row, int col) { |
527 |
return (0 <= row) && (row < RANKS) && (0 <= col) && (col < RANKS); |
528 |
} |
529 |
|
530 |
// The representation |
531 |
|
532 |
long blue_; // bit vector; true if occupied by blue |
533 |
long green_; // same for green; |
534 |
|
535 |
// constructors and intializers: |
536 |
|
537 |
public Board() { blue_ = 0L; green_ = 0L; } |
538 |
public Board(Board b) { blue_ = b.blue_; green_ = b.green_; } |
539 |
public Board(long b, long g) { blue_ = b; green_ = g; } |
540 |
|
541 |
public void copyState(Board b) { |
542 |
blue_ = b.blue_; |
543 |
green_ = b.green_; |
544 |
} |
545 |
|
546 |
void reset() { |
547 |
blue_ = 0L; green_ = 0L; |
548 |
} |
549 |
|
550 |
long getBlue() { return blue_; } |
551 |
long getGreen() { return green_; } |
552 |
|
553 |
public Player occupant(int row, int col) { |
554 |
if ((0 <= row) && (row < RANKS) && (0 <= col) && (col < RANKS)) { |
555 |
long m = 1L << (row + col * RANKS); |
556 |
if ((blue_ & m) != 0L) return Player.Blue; |
557 |
else if ((green_ &m) != 0L) return Player.Green; |
558 |
else return Player.Empty; |
559 |
} |
560 |
else |
561 |
return Player.Illegal; |
562 |
} |
563 |
|
564 |
/** Places a tile without taking opponent tiles. */ |
565 |
public void occupy(Player player, int row, int col) { |
566 |
long m = 1L << (row + col * RANKS); |
567 |
long nm = ~m; |
568 |
if (player.code_ == Player.BLUE) { |
569 |
blue_ |= m; |
570 |
green_ &= nm; |
571 |
} |
572 |
else if (player.code_ == Player.GREEN) { |
573 |
blue_ &= nm; |
574 |
green_ |= m; |
575 |
} |
576 |
else { |
577 |
blue_ &= nm; |
578 |
green_ &= nm; |
579 |
} |
580 |
} |
581 |
|
582 |
public void unoccupy(int row, int col) { |
583 |
long nm = ~(1L << (row + col * RANKS)); |
584 |
blue_ &= nm; |
585 |
green_ &= nm; |
586 |
} |
587 |
|
588 |
/** Places a tile, taking all adjacent tiles of opponent. */ |
589 |
public void take(Player player, int row, int col) { |
590 |
int k = row + col * RANKS; |
591 |
long dest = 1L << k; |
592 |
long nbrMask = adjacentMasks[k]; |
593 |
long sourceBlue = blue_; |
594 |
long sourceGreen = green_; |
595 |
if (player.code_ == Player.BLUE) { |
596 |
blue_ = sourceBlue | dest | (sourceGreen & nbrMask); |
597 |
green_ = sourceGreen & ~(sourceGreen & nbrMask); |
598 |
} |
599 |
else { |
600 |
blue_ = sourceBlue & ~(sourceBlue & nbrMask); |
601 |
green_ = sourceGreen | dest | (sourceBlue & nbrMask); |
602 |
} |
603 |
} |
604 |
|
605 |
public boolean gameOver() { |
606 |
return |
607 |
(((blue_ | green_) & FULL) == FULL) || |
608 |
((blue_ & ~BLUEBIT) == 0) || |
609 |
((green_ & ~BLUEBIT) == 0); |
610 |
} |
611 |
|
612 |
public int score(Player player) { |
613 |
if (player.isBlue()) { |
614 |
return score(blue_, green_); |
615 |
} |
616 |
else { |
617 |
return score(green_, blue_); |
618 |
} |
619 |
} |
620 |
|
621 |
static int score(long b, long g) { |
622 |
|
623 |
// much faster by splitting into ints |
624 |
// and using clever shift-based bit counter |
625 |
|
626 |
int lb = (int)(b & ((1L << 32) - 1)); |
627 |
int hb = ((int)(b >>> 32)) & ((1 << (CELLS - 32)) - 1); |
628 |
|
629 |
lb -= (0xaaaaaaaa & lb) >>> 1; |
630 |
lb = (lb & 0x33333333) + ((lb >>> 2) & 0x33333333); |
631 |
lb = lb + (lb >>> 4) & 0x0f0f0f0f; |
632 |
lb += lb >>> 8; |
633 |
lb += lb >>> 16; |
634 |
|
635 |
hb -= (0xaaaaaaaa & hb) >>> 1; |
636 |
hb = (hb & 0x33333333) + ((hb >>> 2) & 0x33333333); |
637 |
hb = hb + (hb >>> 4) & 0x0f0f0f0f; |
638 |
hb += hb >>> 8; |
639 |
hb += hb >>> 16; |
640 |
|
641 |
hb = ((lb + hb) & 0xff); |
642 |
|
643 |
int lg = (int)(g & ((1L << 32) - 1)); |
644 |
int hg = ((int)(g >>> 32)) & ((1 << (CELLS - 32)) - 1); |
645 |
|
646 |
lg -= (0xaaaaaaaa & lg) >>> 1; |
647 |
lg = (lg & 0x33333333) + ((lg >>> 2) & 0x33333333); |
648 |
lg = lg + (lg >>> 4) & 0x0f0f0f0f; |
649 |
lg += lg >>> 8; |
650 |
lg += lg >>> 16; |
651 |
|
652 |
hg -= (0xaaaaaaaa & hg) >>> 1; |
653 |
hg = (hg & 0x33333333) + ((hg >>> 2) & 0x33333333); |
654 |
hg = hg + (hg >>> 4) & 0x0f0f0f0f; |
655 |
hg += hg >>> 8; |
656 |
hg += hg >>> 16; |
657 |
|
658 |
return hb - ((lg + hg) & 0xff); |
659 |
} |
660 |
|
661 |
static int slowscore(long b, long g) { |
662 |
int score = 0; |
663 |
for (int l = 0; l < CELLS; ++l) { |
664 |
score += (int)(b & 1); |
665 |
b >>>= 1; |
666 |
score -= (int)(g & 1); |
667 |
g >>>= 1; |
668 |
} |
669 |
return score; |
670 |
} |
671 |
} |
672 |
|
673 |
/** |
674 |
* Moves represent transitions across Board states |
675 |
*/ |
676 |
static final class Move { |
677 |
|
678 |
static final int NO_VALUE = -1; // row/col value if not yet set |
679 |
static final int PASS_VALUE = -2; // special value for pass moves |
680 |
|
681 |
// utilities for classifying moves |
682 |
|
683 |
public static boolean twoFrom(int a, int b) { |
684 |
return (a - b == 2) || (b - a == 2); |
685 |
} |
686 |
|
687 |
public static boolean withinTwo(int a, int b) { |
688 |
int diff = a - b; return -2 <= diff && diff <= 2; |
689 |
} |
690 |
|
691 |
// representations |
692 |
|
693 |
int fromRow; |
694 |
int fromCol; |
695 |
|
696 |
int toRow; |
697 |
int toCol; |
698 |
|
699 |
Player player_; |
700 |
Board board_; |
701 |
|
702 |
boolean committed = false; // true if board reflects move |
703 |
|
704 |
// constructors and intializers |
705 |
|
706 |
public Move(Player turn, Board board) { |
707 |
fromRow = NO_VALUE; fromCol = NO_VALUE; |
708 |
toRow = NO_VALUE; toCol = NO_VALUE; |
709 |
player_ = turn; |
710 |
board_ = board; |
711 |
} |
712 |
|
713 |
public Move(Player turn, Board board, boolean isCommitted) { |
714 |
fromRow = NO_VALUE; fromCol = NO_VALUE; |
715 |
toRow = NO_VALUE; toCol = NO_VALUE; |
716 |
player_ = turn; |
717 |
board_ = board; |
718 |
committed = isCommitted; |
719 |
} |
720 |
|
721 |
synchronized void reset() { |
722 |
fromRow = NO_VALUE; |
723 |
fromCol = NO_VALUE; |
724 |
toRow = NO_VALUE; |
725 |
toCol = NO_VALUE; |
726 |
} |
727 |
|
728 |
// setters: |
729 |
|
730 |
synchronized void player(Player p) { player_ = p; } |
731 |
synchronized void board(Board b) { board_ = b; } |
732 |
synchronized void from(int sr, int sc) { fromRow = sr; fromCol = sc; } |
733 |
synchronized void to(int dr, int dc) { toRow = dr; toCol = dc; } |
734 |
|
735 |
// accessors: |
736 |
|
737 |
synchronized boolean isFrom(int r, int c) { |
738 |
return fromRow== r && fromCol == c; |
739 |
} |
740 |
synchronized boolean isTo(int r, int c) { |
741 |
return toRow == r && toCol == c; |
742 |
} |
743 |
synchronized Board board() { |
744 |
return board_; |
745 |
} |
746 |
synchronized Player player() { |
747 |
return player_; |
748 |
} |
749 |
|
750 |
|
751 |
// status checks: |
752 |
|
753 |
synchronized boolean isPass() { // is this a `pass' move? |
754 |
return (toRow == PASS_VALUE || fromRow == PASS_VALUE); |
755 |
} |
756 |
|
757 |
synchronized boolean isJump() { |
758 |
return |
759 |
(fromRow - toRow == 2) || (toRow - fromRow == 2) || |
760 |
(fromCol - toCol == 2) || (toCol - fromCol == 2); |
761 |
} |
762 |
|
763 |
synchronized boolean hasFrom() { // is from set? |
764 |
return fromRow != NO_VALUE && fromCol != NO_VALUE; |
765 |
} |
766 |
|
767 |
synchronized boolean hasTo() { // is to set? |
768 |
return toRow != NO_VALUE && toCol != NO_VALUE; |
769 |
} |
770 |
|
771 |
synchronized boolean possibleTo(int r, int c) { // is (r, c) a legal `to'? |
772 |
return hasFrom() && |
773 |
withinTwo(fromRow, r) && |
774 |
withinTwo(fromCol, c) && |
775 |
board_.occupant(r, c).isEmpty(); |
776 |
} |
777 |
|
778 |
synchronized boolean isLegal() { |
779 |
if (isPass()) |
780 |
return true; |
781 |
else if (!board_.occupant(toRow, toCol).isEmpty()) |
782 |
return false; |
783 |
else if (!board_.occupant(fromRow, fromCol).same(player_)) |
784 |
return false; |
785 |
else if (!(withinTwo(fromRow, toRow) && withinTwo(fromCol, toCol))) |
786 |
return false; |
787 |
else |
788 |
return true; |
789 |
} |
790 |
|
791 |
synchronized void commit() { // update board to reflect move |
792 |
if (!committed) { |
793 |
committed = true; |
794 |
if (isLegal() && !isPass()) { |
795 |
if (isJump()) board_.occupy(Player.Empty, fromRow, fromCol); |
796 |
board_.take(player_, toRow, toCol); |
797 |
} |
798 |
} |
799 |
} |
800 |
|
801 |
} |
802 |
|
803 |
/** |
804 |
* Mover is an abstract class to simplify code dealing with |
805 |
* either user moves or auto moves. |
806 |
*/ |
807 |
abstract static class Mover { |
808 |
|
809 |
// caller for move callbacks |
810 |
protected Microscope game; |
811 |
|
812 |
protected Mover(Microscope ap) { game = ap; } |
813 |
|
814 |
// start a turn as player on given board |
815 |
public abstract void startTurn(Board b, Player p); |
816 |
|
817 |
// cancel current partial move |
818 |
public abstract void cancel(); |
819 |
|
820 |
// return true if move not yet ready |
821 |
public abstract boolean placing(); |
822 |
|
823 |
} |
824 |
|
825 |
/** |
826 |
* User builds moves via instructions/clicks by users |
827 |
*/ |
828 |
static class User extends Mover { |
829 |
|
830 |
private Move current; |
831 |
|
832 |
public User(Microscope ap) { super(ap); current = null; } |
833 |
|
834 |
public synchronized void startTurn(Board b, Player p) { |
835 |
current = new Move(p, b); |
836 |
} |
837 |
|
838 |
public boolean placing() { |
839 |
return current != null && current.hasFrom() && !current.hasTo(); |
840 |
} |
841 |
|
842 |
public synchronized void cancel() { |
843 |
if (current != null) { |
844 |
current.reset(); |
845 |
current = null; |
846 |
} |
847 |
} |
848 |
|
849 |
public synchronized void choose(int row, int col) { |
850 |
if (current != null) { |
851 |
if (row == Move.PASS_VALUE) { |
852 |
current.from(row, col); |
853 |
game.move(current, this); |
854 |
current = null; |
855 |
} |
856 |
else if (!current.hasFrom()) { |
857 |
if (current.board().occupant(row, col).same(current.player())) { |
858 |
current.from(row, col); |
859 |
} |
860 |
} |
861 |
else { |
862 |
current.to(row, col); |
863 |
game.move(current, this); |
864 |
current = null; |
865 |
} |
866 |
} |
867 |
} |
868 |
|
869 |
public synchronized boolean canMoveTo(int row, int col) { |
870 |
return placing() && current.possibleTo(row, col); |
871 |
} |
872 |
|
873 |
public synchronized boolean hasMovedFrom(int row, int col) { |
874 |
return current != null && current.isFrom(row, col); |
875 |
} |
876 |
|
877 |
} |
878 |
|
879 |
/** |
880 |
* AutoMover constructs Finders that compute actual moves |
881 |
*/ |
882 |
static class AutoMover extends Mover { |
883 |
|
884 |
boolean cancelled = false; |
885 |
RootFinder currentFinder = null; |
886 |
|
887 |
public AutoMover(Microscope ap) { |
888 |
super(ap); |
889 |
} |
890 |
|
891 |
public synchronized boolean placing() { |
892 |
return currentFinder != null; |
893 |
} |
894 |
|
895 |
synchronized void stopPlacing() { |
896 |
currentFinder = null; |
897 |
} |
898 |
|
899 |
public synchronized void cancel() { |
900 |
if (placing()) { |
901 |
currentFinder.cancel(false); |
902 |
stopPlacing(); |
903 |
} |
904 |
} |
905 |
|
906 |
public synchronized void startTurn(Board board, Player player) { |
907 |
if (!placing()) { |
908 |
currentFinder = new RootFinder(board, player, |
909 |
Microscope.lookAheads, this); |
910 |
group.execute(currentFinder); |
911 |
} |
912 |
} |
913 |
|
914 |
synchronized void relay(Move move) { // relay callback from finder |
915 |
if (placing()) { |
916 |
stopPlacing(); |
917 |
game.move(move, this); |
918 |
} |
919 |
} |
920 |
|
921 |
} |
922 |
|
923 |
/** |
924 |
* Implements a classic all-possible-move search algorithm using |
925 |
* ForkJoinTasks. The move finder is not all that smart. Among |
926 |
* other possible improvements, it could keep a cache of explored |
927 |
* moves and avoid repeating them. This would likely speed it up |
928 |
* since most expansions are duplicates of others. It could also |
929 |
* be changed to prune moves, although this is unlikely to work |
930 |
* well without better partial evaluation functions. |
931 |
*/ |
932 |
static class Finder extends RecursiveAction { |
933 |
|
934 |
static final int NOMOVE = Integer.MIN_VALUE; |
935 |
static final int LOSE = NOMOVE+1; |
936 |
static final int WIN = -LOSE; |
937 |
|
938 |
final long ours; // bits for our tiles |
939 |
final long theirs; // bits for opponent tiles |
940 |
final int level; // current number of lookAheads |
941 |
final Finder next; // Each Finder is placed in a linked list by parent |
942 |
|
943 |
// Assigned once; must be volatile since accessed by parents |
944 |
volatile int bestScore; |
945 |
|
946 |
Finder(long ours, long theirs, int level, Finder next) { |
947 |
this.ours = ours; |
948 |
this.theirs = theirs; |
949 |
this.level = level; |
950 |
this.next = next; |
951 |
} |
952 |
|
953 |
protected final void compute() { |
954 |
|
955 |
// Handle sure wins and losses here |
956 |
if ((ours & ~Board.BLUEBIT) == 0) |
957 |
bestScore = LOSE; |
958 |
|
959 |
else if ((theirs & ~Board.BLUEBIT) == 0) |
960 |
bestScore = WIN; |
961 |
|
962 |
else if (((ours | theirs) & Board.FULL) == Board.FULL) { |
963 |
int score = Board.score(ours, theirs); |
964 |
if (score > 0) bestScore = WIN; |
965 |
else if (score < 0) bestScore = LOSE; |
966 |
else bestScore = 0; |
967 |
} |
968 |
|
969 |
else |
970 |
search(); |
971 |
} |
972 |
|
973 |
final void search() { |
974 |
int best = NOMOVE; // For direct evaluation when level == 1 |
975 |
Finder forked = null; // list of forked subtasks when level > 1 |
976 |
|
977 |
long open = ~(ours | theirs); // currently empty cells |
978 |
long here = 1; // traverse through bits |
979 |
|
980 |
for (int k = 0; k < Board.CELLS; ++k, here <<= 1) { |
981 |
if ((here & ours) != 0) { |
982 |
/* |
983 |
* Step through possible destinations to find |
984 |
* jumps for this tile |
985 |
*/ |
986 |
byte[] dests = Board.jumpDestinations[k]; |
987 |
for (int j = 0; j < dests.length; ++j) { |
988 |
byte d = dests[j]; |
989 |
long dest = 1L << d; |
990 |
|
991 |
if ( (dest & open) != 0) { |
992 |
long adjacent = Board.adjacentMasks[d]; |
993 |
long nTheirs = theirs & ~adjacent; |
994 |
long nOurs = (ours & ~here) | dest | (theirs & adjacent); |
995 |
|
996 |
if (level > 1) |
997 |
(forked = |
998 |
new Finder(nTheirs, nOurs, level-1, forked)).fork(); |
999 |
else { |
1000 |
int sc = Board.score(nOurs, nTheirs); |
1001 |
if (sc > best) best = sc; |
1002 |
} |
1003 |
} |
1004 |
} |
1005 |
} |
1006 |
else if ((here & open) != 0) { |
1007 |
/* |
1008 |
* If this cell is open, and is within 1 of one of |
1009 |
* our tiles, it can be taken in some copy move. |
1010 |
* It doesn't matter which of the adjacent cells |
1011 |
* is considered to be source of copy move |
1012 |
*/ |
1013 |
long adjacent = Board.adjacentMasks[k]; |
1014 |
if ((ours & adjacent) != 0) { |
1015 |
long nTheirs = theirs & ~adjacent; |
1016 |
long nOurs = ours | here | (theirs & adjacent); |
1017 |
if (level > 1) |
1018 |
(forked = new Finder(nTheirs, nOurs, level-1, forked)).fork(); |
1019 |
else { |
1020 |
int sc = Board.score(nOurs, nTheirs); |
1021 |
if (sc > best) best = sc; |
1022 |
} |
1023 |
} |
1024 |
} |
1025 |
} |
1026 |
|
1027 |
if (level > 1) |
1028 |
collect(forked); |
1029 |
else |
1030 |
bestScore = best; |
1031 |
} |
1032 |
|
1033 |
/** |
1034 |
* Join all subtasks and evaluate moves. Default is sub-finder version. |
1035 |
* Overridden in RootFinder. |
1036 |
*/ |
1037 |
void collect(Finder forked) { |
1038 |
int best = NOMOVE; |
1039 |
while (forked != null) { |
1040 |
while (!forked.isDone()) { |
1041 |
// interleave joins with status checks |
1042 |
if (isDone()) { |
1043 |
cancelAll(forked); |
1044 |
return; |
1045 |
} |
1046 |
else { |
1047 |
ForkJoinTask<?> t = pollTask(); |
1048 |
if (t != null) |
1049 |
t.quietlyInvoke(); |
1050 |
} |
1051 |
} |
1052 |
int score = -forked.bestScore; // negate opponent score |
1053 |
if (score > best) { |
1054 |
best = score; |
1055 |
if (score >= WIN) { |
1056 |
cancelAll(forked.next); |
1057 |
break; |
1058 |
} |
1059 |
} |
1060 |
forked = forked.next; |
1061 |
} |
1062 |
|
1063 |
bestScore = best; |
1064 |
} |
1065 |
|
1066 |
/** |
1067 |
* Cancels all forked subtasks in list. |
1068 |
*/ |
1069 |
void cancelAll(Finder forked) { |
1070 |
while (forked != null) { |
1071 |
forked.cancel(false); |
1072 |
forked = forked.next; |
1073 |
} |
1074 |
} |
1075 |
|
1076 |
} |
1077 |
|
1078 |
/** |
1079 |
* Root Finder class -- wait out other finders and issue callback to game. |
1080 |
*/ |
1081 |
static class RootFinder extends Finder { |
1082 |
final AutoMover automover; |
1083 |
final Player player; |
1084 |
RootFinder(Board board, Player p, int level, AutoMover automover) { |
1085 |
super( (p.isBlue() ? (board.getBlue()| Board.BLUEBIT) : board.getGreen()), |
1086 |
(p.isBlue() ? board.getGreen() : (board.getBlue()| Board.BLUEBIT)), |
1087 |
level, |
1088 |
null); |
1089 |
|
1090 |
this.player = p; |
1091 |
this.automover = automover; |
1092 |
} |
1093 |
|
1094 |
/** |
1095 |
* This differs from default version by recording |
1096 |
* and calling back with best move |
1097 |
*/ |
1098 |
void collect(Finder forked) { |
1099 |
int best = NOMOVE; |
1100 |
Finder bestFinder = null; |
1101 |
while (forked != null) { |
1102 |
while (!forked.isDone()) { |
1103 |
if (isDone()) { |
1104 |
cancelAll(forked); |
1105 |
return; |
1106 |
} |
1107 |
else { |
1108 |
ForkJoinTask<?> t = pollTask(); |
1109 |
if (t != null) |
1110 |
t.quietlyInvoke(); |
1111 |
} |
1112 |
} |
1113 |
int score = -forked.bestScore; // negate opponent score |
1114 |
if (bestFinder == null || score > best) { |
1115 |
best = score; |
1116 |
bestFinder = forked; |
1117 |
if (score >= WIN) { |
1118 |
cancelAll(forked.next); |
1119 |
break; |
1120 |
} |
1121 |
} |
1122 |
|
1123 |
// Just for fun, introduce a little randomness via hashcodes |
1124 |
else if (score == best && |
1125 |
!Microscope.DETERMINISTIC && |
1126 |
(System.identityHashCode(forked) > |
1127 |
System.identityHashCode(bestFinder))) { |
1128 |
bestFinder = forked; |
1129 |
} |
1130 |
forked = forked.next; |
1131 |
} |
1132 |
|
1133 |
Move move = null; |
1134 |
if (bestFinder != null) { |
1135 |
/* |
1136 |
Even though accessed here, |
1137 |
the ours and theirs vars of Finders do not |
1138 |
need to be volatile because they are immutably |
1139 |
established in constructors. |
1140 |
*/ |
1141 |
|
1142 |
long nextOurs = bestFinder.theirs; |
1143 |
long nextTheirs = bestFinder.ours; |
1144 |
long blue = player.isBlue() ? nextOurs : nextTheirs; |
1145 |
long green = player.isBlue() ? nextTheirs : nextOurs; |
1146 |
move = new Move(player, new Board(blue, green), true); |
1147 |
} |
1148 |
automover.relay(move); |
1149 |
} |
1150 |
} |
1151 |
} |