com.linkedin.pinot.transport.netty.NettyTCPServer.java Source code

Introduction

Here is the source code for com.linkedin.pinot.transport.netty.NettyTCPServer.java

Source

/**
 * Copyright (C) 2014-2015 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.linkedin.pinot.transport.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;

import com.linkedin.pinot.common.Utils;
import com.linkedin.pinot.common.metrics.AggregatedMetricsRegistry;
import com.linkedin.pinot.transport.metrics.AggregatedTransportServerMetrics;
import com.linkedin.pinot.transport.metrics.NettyServerMetrics;
import com.yammer.metrics.core.MetricsRegistry;

/**
 *
 * TCP Server
 *
 *
 */
public class NettyTCPServer extends NettyServer {

    public NettyTCPServer(int port, RequestHandlerFactory handlerFactory, AggregatedMetricsRegistry registry,
            long defaultLargeQueryLatencyMs) {
        super(port, handlerFactory, registry, defaultLargeQueryLatencyMs);
    }

    public NettyTCPServer(int port, RequestHandlerFactory handlerFactory, AggregatedMetricsRegistry registry) {
        this(port, handlerFactory, registry, 100);
    }

    @Override
    protected ServerBootstrap getServerBootstrap() {
        ServerBootstrap b = new ServerBootstrap();
        b.group(_bossGroup, _workerGroup).channel(NioServerSocketChannel.class)
                .childHandler(createChannelInitializer()).option(ChannelOption.SO_BACKLOG, 128)
                .childOption(ChannelOption.SO_KEEPALIVE, true);
        return b;
    }

    protected ChannelInitializer<SocketChannel> createChannelInitializer() {
        return new ServerChannelInitializer(_handlerFactory, _metricsRegistry, _metrics,
                _defaultLargeQueryLatencyMs);
    }

    /**
     * Server Channel Initializer
     */
    protected static class ServerChannelInitializer extends ChannelInitializer<SocketChannel> {
        private final RequestHandlerFactory _handlerFactory;
        /**
         * If we note that we have higher overhead because of aggregation, we can use a single
         * metric for tracking server metrics. This can be done by doing
         * (a) Not using _globalMetrics ( = null); and
         * (b) All new instantiation of NettyServerMetrics will use the same name (or)
         * (c) Better Solution : Use one instance of NettyServerMetrics for all instantiations.
         */
        private final MetricsRegistry _registry;
        private final AggregatedTransportServerMetrics _globalMetrics;
        private final long _defaultLargeQueryLatencyMs;

        public ServerChannelInitializer(RequestHandlerFactory handlerFactory, MetricsRegistry registry,
                AggregatedTransportServerMetrics globalMetrics, long defaultLargeQueryLatencyMs) {
            _handlerFactory = handlerFactory;
            _registry = registry;
            _globalMetrics = globalMetrics;
            _defaultLargeQueryLatencyMs = defaultLargeQueryLatencyMs;
        }

        public ServerChannelInitializer(RequestHandlerFactory handlerFactory, MetricsRegistry registry,
                AggregatedTransportServerMetrics globalMetrics) {
            this(handlerFactory, registry, globalMetrics, 100);
        }

        @Override
        protected void initChannel(SocketChannel ch) throws Exception {
            LOGGER.info("Setting up Server channel !!");
            ch.pipeline().addLast("decoder", new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));
            ch.pipeline().addLast("encoder", new LengthFieldPrepender(4));
            //ch.pipeline().addLast("logger", new LoggingHandler());
            // Create server metric for this handler and add to aggregate if present
            NettyServerMetrics serverMetric = new NettyServerMetrics(_registry,
                    NettyTCPServer.class.getName() + "_" + Utils.getUniqueId() + "_");

            if (null != _globalMetrics) {
                _globalMetrics.addTransportClientMetrics(serverMetric);
            }

            ch.pipeline().addLast("request_handler", new NettyChannelInboundHandler(
                    _handlerFactory.createNewRequestHandler(), serverMetric, _defaultLargeQueryLatencyMs));
        }
    }
}