/*
* Copyright 2011 BetaSteward_at_googlemail.com. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY BetaSteward_at_googlemail.com ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BetaSteward_at_googlemail.com OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* The views and conclusions contained in the software and documentation are those of the
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*/
package mage.player.ai;
import java.util.UUID;
import java.util.concurrent.Callable;
import mage.game.Game;
import org.apache.log4j.Logger;
/**
*
* @author BetaSteward_at_googlemail.com
*/
public class MCTSExecutor implements Callable<Boolean> {
protected transient MCTSNode root;
protected int thinkTime;
protected UUID playerId;
protected int simCount;
private static final Logger logger = Logger.getLogger(ComputerPlayerMCTS.class);
public MCTSExecutor(Game sim, UUID playerId, int thinkTime) {
this.playerId = playerId;
this.thinkTime = thinkTime;
root = new MCTSNode(playerId, sim);
}
@Override
public Boolean call() {
simCount = 0;
MCTSNode current;
while (true) {
current = root;
// Selection
while (!current.isLeaf()) {
current = current.select(this.playerId);
}
int result;
if (!current.isTerminal()) {
// Expansion
current.expand();
// only run simulations for nodes that have siblings
if (current.getNumChildren() > 1) {
// Simulation
current = current.select(this.playerId);
result = current.simulate(this.playerId);
simCount++;
}
else {
current = current.select(this.playerId);
result = 0;
}
}
else {
result = current.isWinner(this.playerId)?1:-1;
}
// Backpropagation
current.backpropagate(result);
}
}
public MCTSNode getRoot() {
return root;
}
public void clear() {
root = null;
}
public int getSimCount() {
return simCount;
}
}