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This article is about how Netty works and how it starts up. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

After building a simple environment and running through Helloworld, we simply understand the running process and startup mode of Netty. All future Netty operations can be simply understood as follows:

Define the parent-child thread group-- > define the relevant processing channel processor in childInitializer-- > provide your own processor to return such a process in the callback function.

We learn more about the running process by simulating the process of communication between the client and the server:

Server side code

ServerInitializer

Decoder for String encoding and decoding has been added here.

ServerHandler

In the following study, I realized that Handler is the most important part of Netty, which is implemented by more than 100 kinds.

Next, the client side

ClientInitializer

ClientHandler

Let's take a look at how the Netty handles the request when the request arrives through the serverhandler implementation:

Send request: localhost:8080

Check the console output.

When the request arrives: add a handler for processing, then register, activate, and call the channelRead0 method

Then we start both the client and the server at the same time.

Server-side output

Client output

The server and the client are continuously outputting.

The implementation of Handler I understand here is similar to Spring's inheritance of Httpservlet, and deal with it after rewriting the method.

Public abstract class SimpleChannelInboundHandler

Extends ChannelInboundHandlerAdapter

Commonly used

SimpleChannelInboundHandler

Inherited

ChannelInboundHandlerAdapter*

* Please keep in mind that

{@ link # channelRead0 (ChannelHandlerContext, I)}

Will be renamed to

* {@ code messageReceived (ChannelHandlerContext, I)}

In 5.0.

*

Thank you for reading! This is the end of the article on "what is the running process and startup mode in Netty". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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