Java tutorial
/** * 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.pulsar.common.util.netty; import java.util.concurrent.ThreadFactory; import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.EventLoopGroup; import io.netty.channel.epoll.Epoll; import io.netty.channel.epoll.EpollChannelOption; import io.netty.channel.epoll.EpollDatagramChannel; import io.netty.channel.epoll.EpollEventLoopGroup; import io.netty.channel.epoll.EpollMode; import io.netty.channel.epoll.EpollServerSocketChannel; import io.netty.channel.epoll.EpollSocketChannel; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.DatagramChannel; import io.netty.channel.socket.ServerSocketChannel; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioDatagramChannel; import io.netty.channel.socket.nio.NioServerSocketChannel; import io.netty.channel.socket.nio.NioSocketChannel; public class EventLoopUtil { /** * @return an EventLoopGroup suitable for the current platform */ public static EventLoopGroup newEventLoopGroup(int nThreads, ThreadFactory threadFactory) { if (Epoll.isAvailable()) { return new EpollEventLoopGroup(nThreads, threadFactory); } else { // Fallback to NIO return new NioEventLoopGroup(nThreads, threadFactory); } } /** * Return a SocketChannel class suitable for the given EventLoopGroup implementation * * @param eventLoopGroup * @return */ public static Class<? extends SocketChannel> getClientSocketChannelClass(EventLoopGroup eventLoopGroup) { if (eventLoopGroup instanceof EpollEventLoopGroup) { return EpollSocketChannel.class; } else { return NioSocketChannel.class; } } public static Class<? extends ServerSocketChannel> getServerSocketChannelClass(EventLoopGroup eventLoopGroup) { if (eventLoopGroup instanceof EpollEventLoopGroup) { return EpollServerSocketChannel.class; } else { return NioServerSocketChannel.class; } } public static Class<? extends DatagramChannel> getDatagramChannelClass(EventLoopGroup eventLoopGroup) { if (eventLoopGroup instanceof EpollEventLoopGroup) { return EpollDatagramChannel.class; } else { return NioDatagramChannel.class; } } public static void enableTriggeredMode(ServerBootstrap bootstrap) { if (Epoll.isAvailable()) { bootstrap.childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED); } } }