Develop those things: how to use go singleton mode to ensure the security of high concurrency of streaming media?

As a developer , Be familiar with the characteristics of different languages 、 Flexible use of the combination of various languages is what developers need to consider .TSINGSEE The R & D personnel of Qingxi video are in the process of platform development , For intelligent analysis Python There will be more compilations , In part of the basic level call capacity, we use Golang More , It's used occasionally Java To do streaming programming .

Today, I want to share with you some practical experience in development ： About Go Single instance mode of .

stay GO In design mode , One mode is singleton mode . Singleton mode is also called singleton mode , Is one of the commonly used patterns , It can ensure that only one instance of a class is created during the operation of the system .Go There are four ways to implement singleton mode in language , They are lazy 、 Hungry Chinese style 、 Double check and sync.Once.

Here's a simple one GO Singleton mode of implementation . The code is as follows ：

type singleton struct{}
var instance = &singleton{}
func GetSingleton() *singleton {
    return instance
}

Definition singleton A structure , And initialization instance object .GetSingleton() Function to get singleton Single instance object of this structure . This kind of singleton object is created when the package is loaded , The object will be created immediately . But it is not recommended in most cases .

If single instantiation , Too many initialization contents , It will take a long time for the program to load . We need to instance The initialization object of is moved to GetSingleton() Go to the function .

type singleton struct{}
var instance *singleton
func GetSingleton() *singleton {
    if instance == nil {
        instance = &singleton{}
    }
    return instance
}

Compared with the previous single case , This single example is in GetSingleton() Function internal call initialization instance Value . So the delay of the first call is GetSingleton() in .

This requires judgment instance == nil The situation of , But only judge nil Not very reliable . If there are multiple goroutine At the same time call ,GetSingleton() Concurrency security cannot be guaranteed .

In this case, you need to add a lock , If... Is called at the same time , This ensures concurrency security . The code reference is as follows ：

import "sync"
type singleton struct{}
var instance *singleton
var mtx sync.Mutex
func GetSingleton() *singleton {
    if instance == nil {
        mtx.Lock()
        defer mtx.Unlock()
        if instance == nil {
            instance = &singleton{}
        }
    }
    return instance
}

As a family, it originated from EasyDarwin Open source framework for technology-based enterprises , In the development process , We are also happy to communicate code technology with all technology development enthusiasts 、 Share development experience , To provide you with some small reference .

TSINGSEE The platform of Qingxi video has strong scalability 、 High compatibility , It's easy to operate 、 Easy to integrate , There are a large number of landing applications in offline scenes . To facilitate the user to call 、 Integration and secondary development , Our platforms provide a wealth of API The interface is freely used by users . Interested users can go to the demonstration platform for experience or deployment testing .