Programmer Think

In the previous article, we analyzed and summarized the construction and initialization of ChannelPipeline in Netty. In this article, we will do a specific code analysis on the addition and deletion of ChannelHandler. 1. Addition of ChannelHandler Below is the official demo source for Netty. You can see that adding a custom channelHandler to ...

Technical points websocket Technology When it comes to chat rooms, the preferred technology is WebSocket, which is a single TCP Connect to full duplex Communication protocol, which is more suitable for business requirements than long connection and short connection Personal summary: long and short connections and polling ar ...

Code background The following functions need to be realized: click the page button in the foreground, and the background will send instructions to the lower computer to control the Internet of things devices. In fact, this logic can be applied to many scenarios. The process of my solution is as follows: The foreground uses On ...

Use Netty to realize a simple communication model. Look at the program: 1. Server side: Class Server: import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.*; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioServerSocketChannel; import ...

I. Pipeline model of netty Netty's Pipeline model uses the responsibility chain design pattern. When the boss thread monitors that there is an accept event on the binding port, it instantiates the Pipeline for the socket connection, loads the InboundHandler and OutboundHandler into the Pipeline in order, and then mounts the socket connection ( ...

Network IO Model and Classification Internet IO model is a frequently mentioned problem. Different books or blogs may have different opinions, so there is no need to cut corners, the key is to understand. Socket connection Regardless of the model, the socket connections used are the same.The following is a typical connection on an application ...

Preface Recently, when looking at the netty source code, I found a class called FastThreadLocal. JDK itself has a ThreadLocal class, so I can roughly think of this class is faster than jdk's own, where is the main speed, and why it is faster. Here is a brief analysis. performance testing ThreadLocal is mainly used in multi-threaded environm ...

Packet sticking and unpacking are inevitable in TCP network programming. Whether the server or the client, when we read or send messages, we need to consider the underlying TCP packet sticking/unpacking mechanism. TCP sticking and unpacking TCP is a "flow" protocol. The so-called stream is a string of data without boundaries. The ...

As Java programmers, netty should be more or less exposed to everyone. Netty is widely used as an asynchronous event-driven network framework. We can see from a map of netty's official website what features netty has: netty's core competence has three points: Extensible Event Model Universal Communicat ...

Said ahead Message Pull Processor Source code analysis Enter this method and find the mapping file according to offset, as described above at org. apache. rocketmq. store. MappedFileQueue # find MappedFileByOffset (long, boolean). Return to this method and find the next mapping file based on offset, org ...