分布式消息服务ROCKETMQ版-收发顺序消息:订阅顺序消息

时间：2024-05-15 15:07:40

订阅顺序消息

只需要在订阅普通消息的代码基础上增加consumer.WithConsumerOrder(true)，参考如下示例代码（以下加粗内容需要替换为实例自有信息，请根据实际情况替换）。

package main

import (
	"context"
	"fmt"
	"os"
	"time"

	"github.com/apache/rocketmq-client-go/v2"
	"github.com/apache/rocketmq-client-go/v2/consumer"
	"github.com/apache/rocketmq-client-go/v2/primitive"
)

func main() {
	c, _ := rocketmq.NewPushConsumer(
		consumer.WithGroupName("testGroup"),
		consumer.WithNsResolver(primitive.NewPassthroughResolver([]string{"192.168.0.1:8100"})),
		consumer.WithConsumerModel(consumer.Clustering),
		consumer.WithConsumeFromWhere(consumer.ConsumeFromFirstOffset),
		consumer.WithConsumerOrder(true),
	)
	err := c.Subscribe("test", consumer.MessageSelector{}, func(ctx context.Context,
		msgs ...*primitive.MessageExt) (consumer.ConsumeResult, error) {
		orderlyCtx, _ := primitive.GetOrderlyCtx(ctx)
		fmt.Printf("orderly context: %v\n", orderlyCtx)
		fmt.Printf("subscribe orderly callback: %v \n", msgs)
		return consumer.ConsumeSuccess, nil
	})
	if err != nil {
		fmt.Println(err.Error())
	}
	// Note: start after subscribe
	err = c.Start()
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(-1)
	}
	time.Sleep(time.Hour)
	err = c.Shutdown()
	if err != nil {
		fmt.Printf("Shutdown Consumer error: %s", err.Error())
	}
}

示例代码中的参数说明如下，请参考收集连接信息获取参数值。