ServerExtendedInfo.java

package edu.washington.cs.oneswarm.f2f.servicesharing;

import java.util.Date;
import java.util.Queue;

public class ServerExtendedInfo extends ServerPublicInfo {
    // Measured in kilobytes (rounded)
    private Queue<Integer> bandwidthHistory; // Last 10 reported bandwidths
    private int avgBandwidth;
    private Queue<Integer> latencyHistory; // Last 10 reported latencies
    private int avgLatency;

    private static final int HISTORY_LENGTH = 10;

    public ServerExtendedInfo(String nickname, long id, int advertBandwidth, String[] exitPolicy,
            Date lastOutage, String version) {
        super(nickname, id, advertBandwidth, exitPolicy, lastOutage, version);
    }

    public int compareTo(ServerPublicInfo other) {
        if (other instanceof ServerExtendedInfo) {
            return this.avgBandwidth - ((ServerExtendedInfo) other).avgBandwidth;
        }
        return super.compareTo(other);
    }

    public void recordBandwidth(int kbps) {
        bandwidthHistory.add(kbps);
        avgBandwidth = averageIntQueue(bandwidthHistory);
    }

    public void recordLatency(int ms) {
        latencyHistory.add(ms);
        avgLatency = averageIntQueue(latencyHistory);
    }

    public int getAvgBandwidth() {
        return avgBandwidth;
    }

    public int getAvgLatency() {
        return avgLatency;
    }

    private int averageIntQueue(Queue<Integer> q) {
        while (q.size() > HISTORY_LENGTH)
            q.remove();
        int sum = 0;
        for (int i = 0; i < q.size(); i++)
            sum += q.remove();
        return sum / q.size();
    }
}