source: src/main/java/negotiator/parties/RandomCounterOfferNegotiationParty.java@ 256

package negotiator.parties;

import java.util.List;

import genius.core.AgentID;
import genius.core.Bid;
import genius.core.actions.Accept;
import genius.core.actions.Action;
import genius.core.actions.Offer;
import genius.core.parties.AbstractNegotiationParty;
import genius.core.parties.NegotiationInfo;

/**
 * Basic voting implementation: this agent accepts and rejects offers with a 50%
 * chance.
 * <p/>
 * The class was created as part of a series of agents used to understand the
 * api better
 *
 * @author David Festen
 */
public class RandomCounterOfferNegotiationParty extends AbstractNegotiationParty 
{
        private Bid lastOffer;

        /**
         * Initializes a new instance of the
         * {@link negotiator.parties.RandomCounterOfferNegotiationParty} class.
         *
         * @param utilitySpace
         *            The utility space used by this class
         * @param deadlines
         *            The deadlines for this session
         * @param timeline
         *            The time line (if time deadline) for this session, can be null
         * @param randomSeed
         *            The seed that should be used for all randomization (to be
         *            reproducible)
         */
        @Override
        public void init(NegotiationInfo info) {

                super.init(info);
        }

        /**
         * If placing offers: do random offer if voting: accept/reject with a 50%
         * chance on both
         *
         * @param possibleActions
         *            List of all actions possible.
         * @return The chosen action
         */
        @Override
        public Action chooseAction(List<Class<? extends Action>> possibleActions) {

                // if we can not accept, we need to do random voting
                if (!possibleActions.contains(Accept.class)) {
                        return new Offer(getPartyId(), generateRandomBid());
                }

                // else do 10/90: random offer, accept
                return timeline.getTime() >= 0.9 ? new Accept(getPartyId(), lastOffer)
                                : new Offer(getPartyId(), generateRandomNonZeroBid());
        }

        private Bid generateRandomNonZeroBid() {
                Bid randomBid;
                double util;
                do {
                        randomBid = generateRandomBid();
                        try {
                                util = utilitySpace.getUtility(randomBid);
                        } catch (Exception e) {
                                util = 0.0;
                        }
                } while (util < 0.1);
                return randomBid;
        }

        /**
         * Processes action messages received by a given sender.
         *
         * @param sender
         *            The initiator of the action
         * @param arguments
         *            The action performed
         */
        @Override
        public void receiveMessage(AgentID sender, Action action) {
                if (action instanceof Offer) {
                        lastOffer = ((Offer) action).getBid();
                }
        }

        @Override
        public String getDescription() {
                return "Place random bids until 90% of time";
        }

}