What are the characteristics of the dish liking function of the door-to-door cooking system developed using Go language?

What are the characteristics of the dish liking function of the door-to-door cooking system developed using Go language?

In modern society, as the pace of life accelerates, more and more people choose to have professional chefs come to their homes to cook delicious food for them. In order to meet this demand, we can use Go language to develop a door-to-door cooking system. In this system, the function of liking dishes is a very important part.

The function of dish like function is to allow users to evaluate and like the dishes in the door-to-door cooking system, so that other users can choose their favorite dishes based on the number of likes. When using Go language to develop this function, we can consider the following features:

1. User identification and authorization:
   In the dish like function, we need to ensure that only logged in users can Perform a like operation. Therefore, we need to implement user identification and authorization functions in the system. The user's unique identifier (such as user ID, mobile phone number, etc.) can be obtained through user registration and login, and identity verification can be performed when the user performs a like operation.
2. Low latency and high concurrency:
   In actual applications, the dish liking function may have a large number of concurrent operations. In order to support fast response and processing in high concurrency situations, we can use the Go language's goroutine and channel to implement asynchronous processing. By putting the like request into a buffer channel, and then having multiple coroutines take the request out of the channel for processing, the concurrency performance of the system can be effectively improved.

The following is a simple sample code to demonstrate how to use Go language to implement the dish like function:

package main

import (
    "fmt"
    "sync"
)

type Dish struct {
    ID        int
    Name      string
    Likes     int
    likedUser map[string]bool  // 存储用户点赞信息
    lock      sync.RWMutex     // 读写锁，用于并发保护
}

func (d *Dish) Like(userID string) {
    d.lock.Lock()
    defer d.lock.Unlock()

    if _, ok := d.likedUser[userID]; !ok {
        d.likedUser[userID] = true
        d.Likes++
    }
}

func main() {
    d := &Dish{
        ID:        1,
        Name:      "红烧肉",
        Likes:     0,
        likedUser: make(map[string]bool),
    }

    go func() {
        for i := 0; i < 100; i++ {
            d.Like(fmt.Sprintf("user%d", i))
        }
    }()

    go func() {
        for i := 0; i < 100; i++ {
            d.Like(fmt.Sprintf("user%d", i))
        }
    }()

    // 等待异步点赞操作完成
    for d.Likes < 200 {
    }

    fmt.Printf("菜品 %s 点赞数：%d
", d.Name, d.Likes)
}

In the above sample code, we define a Dish structure , used to represent dishes. The structure contains the dish's ID, name, number of likes, and a likedUser map that stores user like information. When liking, we use a read-write lock to protect the concurrent access of likedUser, and record whether the user has liked it through the key-value pair of the map. The like operation is completed by checking and updating likedUser.

In the main function, we use two coroutines to like the dishes 100 times. Since the like operation is asynchronous, in order to wait for the like operation to complete, we use a simple loop to determine whether the number of likes has reached 200.

To sum up, using the Go language to develop the dish liking function of the door-to-door cooking system has the characteristics of user identification and authorization, low latency and high concurrency. By making reasonable use of the language features and concurrency mechanism of the Go language, we can implement a stable and efficient like function and provide users with a better user experience.

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