gremlin-tools/gremlin-socket-server/src/main/java/org/apache/tinkerpop/gremlin/socket/server/SimpleSocketServer.java

/*
 * 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.tinkerpop.gremlin.socket.server;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;

/**
 * A Simple Netty Server intended to be used as a base for gremlin test servers.
 * Server behavior is defined by the {@link ChannelInitializer} passed in the start method.
 */
public class SimpleSocketServer {
    private final SocketServerSettings settings;
    private EventLoopGroup bossGroup;
    private EventLoopGroup workerGroup;

    public SimpleSocketServer(final SocketServerSettings settings) {
        this.settings = settings;
    }

    public Channel start(final ChannelInitializer<SocketChannel> channelInitializer) throws InterruptedException {
        bossGroup = new NioEventLoopGroup(1);
        workerGroup = new NioEventLoopGroup();
        final ServerBootstrap b = new ServerBootstrap();
        b.group(bossGroup, workerGroup)
                .channel(NioServerSocketChannel.class)
                .handler(new LoggingHandler(LogLevel.INFO))
                .childHandler(channelInitializer);
        return b.bind(settings.PORT).sync().channel();
    }

    public void stop() {
        bossGroup.shutdownGracefully();
        workerGroup.shutdownGracefully();
    }

    public void stopSync() throws InterruptedException {
        bossGroup.shutdownGracefully().sync();
        workerGroup.shutdownGracefully().sync();
    }
}