org.apache.carbondata.core.dictionary.server.DictionaryServer.java Source code

Introduction

Here is the source code for org.apache.carbondata.core.dictionary.server.DictionaryServer.java

Source

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.carbondata.core.dictionary.server;

import org.apache.carbondata.common.logging.LogService;
import org.apache.carbondata.common.logging.LogServiceFactory;
import org.apache.carbondata.core.dictionary.generator.key.DictionaryMessage;
import org.apache.carbondata.core.dictionary.generator.key.DictionaryMessageType;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;

/**
 * Dictionary Server to generate dictionary keys.
 */
public class DictionaryServer {

    private static final LogService LOGGER = LogServiceFactory.getLogService(DictionaryServer.class.getName());

    private DictionaryServerHandler dictionaryServerHandler;

    private EventLoopGroup boss;
    private EventLoopGroup worker;

    /**
     * start dictionary server
     *
     * @param port
     * @throws Exception
     */
    public void startServer(int port) {
        long start = System.currentTimeMillis();
        dictionaryServerHandler = new DictionaryServerHandler();
        boss = new NioEventLoopGroup();
        worker = new NioEventLoopGroup();
        // Configure the server.
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(boss, worker);
            bootstrap.channel(NioServerSocketChannel.class);

            bootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
                @Override
                public void initChannel(SocketChannel ch) throws Exception {
                    ChannelPipeline pipeline = ch.pipeline();
                    pipeline.addLast("DictionaryServerHandler", dictionaryServerHandler);
                }
            });
            bootstrap.childOption(ChannelOption.SO_KEEPALIVE, true);
            bootstrap.bind(port).sync();

            LOGGER.info("Dictionary Server started, Time spent " + (System.currentTimeMillis() - start)
                    + " Listening on port " + port);
        } catch (Exception e) {
            LOGGER.error(e, "Dictionary Server Start Failed");
            throw new RuntimeException(e);
        }
    }

    /**
     * shutdown dictionary server
     *
     * @throws Exception
     */
    public void shutdown() throws Exception {
        worker.shutdownGracefully();
        boss.shutdownGracefully();
        // Wait until all threads are terminated.
        boss.terminationFuture().sync();
        worker.terminationFuture().sync();
    }

    /**
     * Write dictionary to the store.
     * @throws Exception
     */
    public void writeDictionary() throws Exception {
        DictionaryMessage key = new DictionaryMessage();
        key.setType(DictionaryMessageType.WRITE_DICTIONARY);
        dictionaryServerHandler.processMessage(key);
    }
}