Golang implements factory mode
Go language is a very popular statically compiled language. Its unique syntax and features make it very suitable for application in many scenarios. Among them, the factory pattern is one of the very common design patterns in the Go language. This article will introduce how to implement the factory pattern in Go language.
- Introduction to Factory Pattern
Factory pattern is a common creation pattern. It defines an interface for creating objects and lets subclasses decide which objects to instantiate. a class. The factory pattern can separate the creation and use of objects, thereby improving the scalability and maintainability of the code.
Factory pattern often has two implementation methods: simple factory pattern and factory method pattern. The simple factory pattern generates all required objects from a factory class. It returns the corresponding objects by judging the type of the incoming parameters. The factory method pattern defines an interface for creating objects and lets subclasses decide which classes need to be instantiated.
- Simple Factory Pattern Implementation
Let’s first look at the implementation of a simple factory pattern. Suppose we have a shape interface (Shape), which has a method (Draw) for drawing shapes. We hope to generate different shape objects, such as Circle and Rectangle, based on the different parameters passed in.
First we define a shape interface:
type Shape interface { Draw() string }
Then we define two shape objects - circle and rectangle:
type Circle struct {} func (c *Circle) Draw() string { return "draw circle" } type Rectangle struct {} func (r *Rectangle) Draw() string { return "draw rectangle" }
Finally we define a factory class (ShapeFactory) , to generate different shape objects based on the different parameters passed in:
type ShapeFactory struct {} func (sf *ShapeFactory) CreateShape(shapeType string) Shape { switch shapeType { case "circle": return &Circle{} case "rectangle": return &Rectangle{} default: panic("wrong shape type") } }
One thing to note here is that the factory class needs to return a shape interface, not a specific shape object. This avoids unnecessary dependence on the user of the specific type of the return value.
The following is a code example using a simple factory pattern:
sf := &ShapeFactory{} circle := sf.CreateShape("circle") fmt.Println(circle.Draw()) // 输出:draw circle rectangle := sf.CreateShape("rectangle") fmt.Println(rectangle.Draw()) // 输出:draw rectangle
- Factory method pattern implementation
Next let’s look at a factory method pattern accomplish. Still taking shapes as an example, we change the original shape interface to a shape factory interface (ShapeFactoryInterface), which defines a method (CreateShape) for creating shape objects:
type ShapeFactoryInterface interface { CreateShape() Shape }
Then we define two Shape factory - Circle Factory (CircleFactory) and Rectangle Factory (RectangleFactory). They all implement the shape factory interface, which is used to create corresponding shape objects:
type CircleFactory struct {} func (cf *CircleFactory) CreateShape() Shape { return &Circle{} } type RectangleFactory struct {} func (rf *RectangleFactory) CreateShape() Shape { return &Rectangle{} }
As you can see, each shape has a corresponding factory, which is used to create instances of the shape. In this way, we can create different shape objects very flexibly without having to worry about coupling issues between different shape objects.
Finally, let’s look at a complete code example for creating factory objects of different shapes:
cf := &CircleFactory{} circle := cf.CreateShape() fmt.Println(circle.Draw()) // 输出:draw circle rf := &RectangleFactory{} rectangle := rf.CreateShape() fmt.Println(rectangle.Draw()) // 输出:draw rectangle
- Summary
That’s it, we Two ways to implement the factory pattern in Go language have been introduced: simple factory pattern and factory method pattern. In practical applications, we can choose the appropriate implementation method based on specific needs and scenarios.
The factory pattern can greatly improve the scalability and maintainability of the code, especially in scenarios where objects need to be created frequently. Therefore, it is very necessary for Go language developers to master the application method of factory pattern.
The above is the detailed content of Golang implements factory mode. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



OpenSSL, as an open source library widely used in secure communications, provides encryption algorithms, keys and certificate management functions. However, there are some known security vulnerabilities in its historical version, some of which are extremely harmful. This article will focus on common vulnerabilities and response measures for OpenSSL in Debian systems. DebianOpenSSL known vulnerabilities: OpenSSL has experienced several serious vulnerabilities, such as: Heart Bleeding Vulnerability (CVE-2014-0160): This vulnerability affects OpenSSL 1.0.1 to 1.0.1f and 1.0.2 to 1.0.2 beta versions. An attacker can use this vulnerability to unauthorized read sensitive information on the server, including encryption keys, etc.

The article discusses writing unit tests in Go, covering best practices, mocking techniques, and tools for efficient test management.

The article explains how to use the pprof tool for analyzing Go performance, including enabling profiling, collecting data, and identifying common bottlenecks like CPU and memory issues.Character count: 159

The library used for floating-point number operation in Go language introduces how to ensure the accuracy is...

Queue threading problem in Go crawler Colly explores the problem of using the Colly crawler library in Go language, developers often encounter problems with threads and request queues. �...

This article introduces a variety of methods and tools to monitor PostgreSQL databases under the Debian system, helping you to fully grasp database performance monitoring. 1. Use PostgreSQL to build-in monitoring view PostgreSQL itself provides multiple views for monitoring database activities: pg_stat_activity: displays database activities in real time, including connections, queries, transactions and other information. pg_stat_replication: Monitors replication status, especially suitable for stream replication clusters. pg_stat_database: Provides database statistics, such as database size, transaction commit/rollback times and other key indicators. 2. Use log analysis tool pgBadg

Backend learning path: The exploration journey from front-end to back-end As a back-end beginner who transforms from front-end development, you already have the foundation of nodejs,...

The problem of using RedisStream to implement message queues in Go language is using Go language and Redis...
