src/main/java/com/google/code/gossip/manager/random/RandomActiveGossipThread.java

package com.google.code.gossip.manager.random;

import java.util.ArrayList;
import java.util.Random;

import com.google.code.gossip.GossipService;
import com.google.code.gossip.LocalGossipMember;
import com.google.code.gossip.manager.GossipManager;
import com.google.code.gossip.manager.impl.SendMembersActiveGossipThread;

public class RandomActiveGossipThread extends SendMembersActiveGossipThread {
	
	/** The Random used for choosing a member to gossip with. */
	private Random _random;

	public RandomActiveGossipThread(GossipManager gossipManager) {
		super(gossipManager);
		
		// Initialize the random used for deciding on which gossip member to gossip with.
		_random = new Random();
	}
	
	/**
	 * [The selectToSend() function.]
	 * Find a random peer from the local membership list.
	 * In the case where this client is the only member in the list, this method will return null.
	 * @return Member random member if list is greater than 1, null otherwise
	 */
	protected LocalGossipMember selectPartner(ArrayList<LocalGossipMember> memberList) {
		LocalGossipMember member = null;

		// We can only send a message if there are actually other members.
		if (memberList.size() > 0) {
			// Get the index of the random member.
			int randomNeighborIndex = _random.nextInt(memberList.size());
			member = memberList.get(randomNeighborIndex);
		} else {
			GossipService.debug("I am alone in this world.");
		}

		return member;
	}

}