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There is a newer version: 5.2.7

/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see .
 */
package org.graylog2.plugin.inputs.util;

import com.codahale.metrics.Gauge;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.SimpleChannelHandler;

import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author Lennart Koopmann 
 */
public class ConnectionCounter extends SimpleChannelHandler {

    private final AtomicInteger connections;
    private long totalConnections;

    public ConnectionCounter() {
        connections = new AtomicInteger();
        totalConnections = 0;
    }

    @Override
    public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        connections.incrementAndGet();
        totalConnections++;
        super.channelConnected(ctx, e);
    }

    @Override
    public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        connections.decrementAndGet();
        super.channelDisconnected(ctx, e);
    }

    public int getConnectionCount() {
        return connections.get();
    }

    public long getTotalConnections() {
        return totalConnections;
    }

    public Gauge gaugeCurrent() {
        return new Gauge() {
            @Override
            public Integer getValue() {
                return getConnectionCount();
            }
        };
    }

    public Gauge gaugeTotal() {
        return new Gauge() {
            @Override
            public Long getValue() {
                return getTotalConnections();
            }
        };
    }

}