Golang decorator mode and its use in NSQ

One background

          Recent research NSQ This middleware , I found something interesting , Decorator mode is one of them . Throughout the project , The use of decorator mode can be seen everywhere , So there's this article .

Two Decorator mode and Go The implementation of the

2.1 Concept

          Decorator pattern is a kind of design pattern , Its definition , Simply speaking , That is, without changing the internal structure of the object , Dynamically extend the functions of objects . By creating a decorator , Packaging real objects , Add new features to objects . stay Java in ,IO It is a typical application to the decorator mode ;Python in , It is also natively supported in syntax , This greatly improves the decorative pattern in Python Application in .

2.2 Go Implement decorator mode

          Let's take an example to see the application of decorators . First, we write a program named test Function of , Output a statement ; as follows ：

package main

import "fmt"

func test() { 
    
	fmt