PingService.java

package org.trimou.example.ping;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicLong;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Named;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author Martin Kouba
 */
@Named("pingService")
@ApplicationScoped
public class PingService {

    private static final Logger LOGGER = LoggerFactory
            .getLogger(PingService.class);

    private AtomicLong generator = new AtomicLong(System.currentTimeMillis());

    private ConcurrentMap<Long, Ping> pings = new ConcurrentHashMap<Long, Ping>();

    private Comparator<Ping> pingComparator = (o1, o2) -> o1.getTime()
            .compareTo(o2.getTime());

    /**
     *
     * @param remoteAddr
     */
    public void ping(String remoteAddr) {
        Ping ping = new Ping(generator.incrementAndGet(), remoteAddr,
                new Date());
        pings.put(ping.getId(), ping);
        LOGGER.info("{}", ping);
    }

    /**
     *
     * @return
     */
    public List<Ping> getPings() {
        List<Ping> result = new ArrayList<Ping>();
        for (Ping task : pings.values()) {
            result.add(task);
        }
        Collections.sort(result, pingComparator);
        return result;
    }

    /**
     *
     * @return
     */
    public Ping getPing(Long id) {
        return pings.get(id);
    }

}