Singleton Pattern You Should Know in Golang(Design Patterns 03)

Singleton Pattern in Go: Eager, Lazy, or Double-Checked?

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Hello, here is Wesley, Today’s article is about singleton pattern in Go. Without further ado, let’s get started.💪

Singleton Pattern, perhaps the most well-known design pattern among all. It’s also a type of creational pattern. When a struct only allows one instance to exist, we’ll use this design pattern. The unique instance of this struct is called the singleton object. It ensures that a class has only one instance and provides a global access point.

In Go language, the implementation of the singleton pattern is relatively simple, mainly achieved through the use of sync.Once and a global variable to ensure thread safety.

What is Singleton Pattern

The core idea of the Singleton Pattern is:

• Uniqueness: There exists only one instance throughout the entire application.
• Global Access: Provides a global access point to obtain this instance.

Applicable Scenarios

• Need to control resource access, such as database connections, thread pools, etc.