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/**
 * The MIT License
 * Copyright (c) 2012 Graylog, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
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();
            }
        };
    }

}