source: src/main/java/agents/SimpleANAC2013Agent.java@ 209

package agents;

import java.io.Serializable;

import genius.core.Agent;
import genius.core.Bid;
import genius.core.NegotiationResult;
import genius.core.actions.Accept;
import genius.core.actions.Action;
import genius.core.actions.DefaultAction;
import genius.core.actions.Offer;

/**
 * This agent is an example of how to createFrom an ANAC2013 agent which learns
 * during the tournament. This agent is a variant of the random agent.
 * 
 * @author M. Hendrikx
 */
public class SimpleANAC2013Agent extends Agent {

        /** The minimum utility a bid should have to be accepted or offered. */
        private double MINIMUM_BID_UTILITY;
        /** The opponent's last action. */
        private Bid opponentLastBid;
        /** Bid with the highest possible utility. */
        private Bid maxBid;

        public SimpleANAC2013Agent() {
        }

        /**
         * Initialize the target utility to MAX(rv, max). Where rv is the
         * reservation value of the preference profile and max is the highest
         * utility received on the current preference profile.
         */
        public void init() {
                Serializable prev = this.loadSessionData();
                if (prev != null) {
                        double previousOutcome = (Double) prev;
                        MINIMUM_BID_UTILITY = Math.max(Math.max(
                                        utilitySpace.getReservationValueUndiscounted(),
                                        previousOutcome), 0.5);
                } else {
                        MINIMUM_BID_UTILITY = utilitySpace
                                        .getReservationValueUndiscounted();
                }
                System.out.println("Minimum bid utility: " + MINIMUM_BID_UTILITY);
        }

        @Override
        public String getVersion() {
                return "1.0";
        }

        @Override
        public String getName() {
                return "Simple ANAC2013 Agent";
        }

        /**
         * Set the target utility for the next match on the same preference profile.
         * If the received utility is higher than the current target, save the
         * received utility as the new target utility.
         */
        public void endSession(NegotiationResult result) {
                if (result.getMyDiscountedUtility() > MINIMUM_BID_UTILITY) {
                        saveSessionData(new Double(result.getMyDiscountedUtility()));
                }
                System.out.println(result);
        }

        /**
         * Retrieve the bid from the opponent's last action.
         */
        public void ReceiveMessage(Action opponentAction) {
                opponentLastBid = DefaultAction.getBidFromAction(opponentAction);
        }

        /**
         * Accept if the utility of the opponent's is higher than the target
         * utility; else return a random bid with a utility at least equal to the
         * target utility.
         */
        public Action chooseAction() {
                if (opponentLastBid != null
                                && getUtility(opponentLastBid) >= MINIMUM_BID_UTILITY) {
                        return new Accept(getAgentID(), opponentLastBid);
                }
                return getRandomBid(MINIMUM_BID_UTILITY);
        }

        /**
         * Return a bid with a utility at least equal to the target utility, or the
         * bid with the highest utility possible if it takes too long to find.
         * 
         * @param target
         * @return found bid.
         */
        private Action getRandomBid(double target) {
                Bid bid = null;
                try {
                        int loops = 0;
                        do {
                                bid = utilitySpace.getDomain().getRandomBid(null);
                                loops++;
                        } while (loops < 100000 && utilitySpace.getUtility(bid) < target);
                        if (bid == null) {
                                if (maxBid == null) {
                                        // this is a computationally expensive operation, therefore
                                        // cache result
                                        maxBid = utilitySpace.getMaxUtilityBid();
                                }
                                bid = maxBid;
                        }
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return new Offer(getAgentID(), bid);
        }
}