Foreword: Netty is a very excellent network application framework that supports high concurrency and high performance network communication. It is suitable for developing various server programs, such as instant messaging, games, Internet of Things, etc. Using Netty can greatly improve the performance and reliability of server programs. This article will introduce the basic principles and […]
Tag: netty
[Netty] ByteToMessageDecoder source code analysis
Table of Contents 1.Protocol Description 2. Implementation of class 3.Decoder workflow 4. Source code analysis 4.1 Accumulator (data accumulation buffer) 4.2 Status code description 4.3 ByteToMessageDecoder#channelRead 4.4 Decoder implementation example 5. How to develop your own Decoder 1.Protocol Description The Netty framework is based on the Java NIO framework. It has powerful performance and supports […]
netty websocket unsafe
Initialization // org.yeauty.standard.WebsocketServer#init public void init() throws InterruptedException {<!– –> EventLoopGroup boss = new NioEventLoopGroup(config.getBossLoopGroupThreads()); EventLoopGroup worker = new NioEventLoopGroup(config.getWorkerLoopGroupThreads()); ServerBootstrap bootstrap = new ServerBootstrap(); bootstrap.group(boss, worker) .channel(NioServerSocketChannel.class) .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, config.getConnectTimeoutMillis()) .option(ChannelOption.SO_BACKLOG, config.getSoBacklog()) .childOption(ChannelOption.WRITE_SPIN_COUNT, config.getWriteSpinCount()) .childOption(ChannelOption.WRITE_BUFFER_WATER_MARK, new WriteBufferWaterMark(config.getWriteBufferLowWaterMark(), config.getWriteBufferHighWaterMark())) .childOption(ChannelOption.TCP_NODELAY, config.isTcpNodelay()) .childOption(ChannelOption.SO_KEEPALIVE, config.isSoKeepalive()) .childOption(ChannelOption.SO_LINGER, config.getSoLinger()) .childOption(ChannelOption.ALLOW_HALF_CLOSURE, config.isAllowHalfClosure()) .handler(new LoggingHandler(LogLevel.DEBUG)) .childHandler(new ChannelInitializer<NioSocketChannel>() {<!– –> @Override protected void […]
Impact of Netty MaxDirectMemorySize configuration on services
The impact of Netty MaxDirectMemorySize configuration on services Direct buffer memory OOM caused by MaxDirectMemorySize configuration once, analyze the cause through debugging. Application scenario: Using the Netty framework to process market push in a production environment Phenomena Error log java.lang.OutOfMemoryError: Direct buffer memory at java.nio.Bits.reserveMemory(Bits.java:175) ~[?:?] at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:118) ~[?:?] at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:318) ~[?:?] at io.netty.buffer.PoolArena$DirectArena.allocateDirect(PoolArena.java:632) ~[netty-buffer-4.1.63.Final.jar!/:4.1.63.Final] […]
netty pipeline
Netty abstracts the pipeline data structure to process or intercept channel-related events. Events are divided into ChannelHandlers lists of inbound events (inBound events) and outbound events (outBound events). ChannelPipeline uses an advanced Intercepting Filter pattern that gives users complete control over how events are handled and how ChannelHandlers in the pipeline interact with each other. […]
Netty (3) Netty model
1. Netty model Netty has made certain improvements mainly based on the master-slave Reactor multi-thread model, in which the master-slave Reactor multi-thread model has multiple Reactors. Simplified layout: illustrate: BossGroup thread maintains Selector and only focuses on Accept When the Accept event is received, the corresponding SocketChannel is obtained, encapsulated into NIOSocketChannel and registered to […]
Netty data reading and writing source code reading
Data reading and writing write Let’s start with writing on the client side After the client establishes a connection with the server, it can get the connected channel object from the future. The channel here is the io.netty.channel.Channel object. Call its channel.writeAndFlush(msg); method to send data. writeAndFlush will call the writeAndFlush method of the pipeline […]
Netty packet parsing problem with half-packet sticking
Adhesive bag problem Netty’s sticky packet problem refers to the fact that during network transmission, due to the characteristics of the TCP protocol itself, several small data packets sent by the sender are merged into one large data packet by the receiver. This situation is called sticky bag. TCP protocol is a stream-oriented protocol with […]
Netty (1) IO model
1. Introduction to Netty Netty is a Java open source framework provided by JBOSS. It is an asynchronous, event-driven network application framework used to quickly develop high-performance, highly reliable network IO programs. Netty is mainly aimed at high-concurrency applications for Clients under the TCP protocol, or applications that require continuous transmission of large amounts of […]
Using Netty for protocol development: multi-protocol support and implementation of custom protocols
Building network applications using Netty: multi-protocol support and implementation of custom protocols Why is an agreement needed? Netty supports a rich set of protocols, allowing programmers to focus on business Custom protocol 1. Preparation 2. Introduction to codec abstract class 3. Codec implementation Why do we need an agreement? In TCP/IP, data transmission is carried […]