com.bloom.zerofs.rest.ConnectionStatsHandler.java Source code

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Here is the source code for com.bloom.zerofs.rest.ConnectionStatsHandler.java

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/**
 * Copyright 2016 Bloom Corp. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 */
package com.bloom.zerofs.rest;

import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import java.util.concurrent.atomic.AtomicLong;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Handler that tracks connection establishment statistics.
 */
@ChannelHandler.Sharable
public class ConnectionStatsHandler extends ChannelInboundHandlerAdapter {
    private final NettyMetrics metrics;
    private final AtomicLong openConnections;
    private static ConnectionStatsHandler instance = null;

    private final Logger logger = LoggerFactory.getLogger(getClass());

    public ConnectionStatsHandler(NettyMetrics metrics) {
        this.metrics = metrics;
        openConnections = new AtomicLong(0);
        metrics.registerConnectionsStatsHandler(openConnections);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        logger.trace("Channel Active " + ctx.channel().remoteAddress());
        metrics.connectionsConnectedCount.inc();
        openConnections.incrementAndGet();
        super.channelActive(ctx);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        logger.trace("Channel Inactive " + ctx.channel().remoteAddress());
        metrics.connectionsDisconnectedCount.inc();
        openConnections.decrementAndGet();
        super.channelInactive(ctx);
    }
}