What complex business requirements can Golang microservice development support?

package main

import (
    "fmt"
    "sync"
)

func worker(id int, jobs <-chan int, results chan<- int) {
    for j := range jobs {
        fmt.Printf("Worker %d started job %d
", id, j)
        // 模拟耗时操作
        for i := 0; i < 1000000000; i++ {
        }
        results <- j
        fmt.Printf("Worker %d finished job %d
", id, j)
    }
}

func main() {
    jobs := make(chan int, 10)
    results := make(chan int, 10)

    // 创建5个worker
    for w := 1; w <= 5; w++ {
        go worker(w, jobs, results)
    }

    // 发送10个任务
    for j := 1; j <= 10; j++ {
        jobs <- j
    }
    close(jobs)

    // 获取结果
    for a := 1; a <= 10; a++ {
        <-results
    }
}

package main

import (
    "log"
    "time"

    "github.com/streadway/amqp"
)

func main() {
    conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/")
    if err != nil {
        log.Fatalf("Failed to connect to RabbitMQ: %v", err)
    }
    defer conn.Close()

    ch, err := conn.Channel()
    if err != nil {
        log.Fatalf("Failed to open a channel: %v", err)
    }
    defer ch.Close()

    err = ch.ExchangeDeclare(
        "logs",   // name
        "fanout", // type
        true,     // durable
        false,    // auto-deleted
        false,    // internal
        false,    // no-wait
        nil,      // arguments
    )
    if err != nil {
        log.Fatalf("Failed to declare an exchange: %v", err)
    }

    q, err := ch.QueueDeclare(
        "",    // name
        false, // durable
        false, // delete when unused
        true,  // exclusive
        false, // no-wait
        nil,   // arguments
    )
    if err != nil {
        log.Fatalf("Failed to declare a queue: %v", err)
    }

    err = ch.QueueBind(
        q.Name, // queue name
        "",     // routing key
        "logs", // exchange
        false,
        nil,
    )
    if err != nil {
        log.Fatalf("Failed to bind a queue: %v", err)
    }

    msgs, err := ch.Consume(
        q.Name, // queue
        "",     // consumer
        true,   // auto-ack
        false,  // exclusive
        false,  // no-local
        false,  // no-wait
        nil,    // args
    )
    if err != nil {
        log.Fatalf("Failed to register a consumer: %v", err)
    }

    forever := make(chan bool)

    go func() {
        for d := range msgs {
            log.Printf("Received a message: %s", d.Body)
        }
    }()

    log.Printf(" [*] Waiting for messages. To exit press CTRL+C")
    <-forever
}

package main

import (
    "log"
    "net/http"
    "os"
    "os/signal"
    "syscall"
)

func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("Hello, World!"))
    })

    srv := http.Server{
        Addr:    ":8080",
        Handler: mux,
    }

    go func() {
        log.Println("Server started")
        err := srv.ListenAndServe()
        if err != nil {
            log.Fatal(err)
        }
    }()

    // 监听系统信号，优雅退出
    stop := make(chan os.Signal, 1)
    signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
    <-stop

    log.Println("Server stopped")
    err := srv.Shutdown(nil)
    if err != nil {
        log.Fatal(err)
    }
}