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DocumentationTDMQ for RocketMQRocketMQ 4.xSDK DocumentationAccess over TCPSpring Boot StarterSending and Receiving Delayed Messages
Sending and Receiving Delayed Messages
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Last updated: 2023-04-12 11:41:05
Sending and Receiving Delayed Messages
Last updated: 2023-04-12 11:41:05
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Overview

This document describes how to use Spring Boot Starter to send and receive messages and helps you better understand the message sending and receiving processes.

Prerequisites

You have created the required resources as instructed in Resource Creation and Preparation.
You have installed JDK 1.8 or later.
You have installed Maven 2.5 or later.
You have learned about the sending and receiving process of general messages.
You have downloaded the demo here or have downloaded one at the GitHub project.

Directions

Sending a message

This process is the same as that of general messages, but you need to pass in the corresponding delay level when calling the sending method.
 SendResult sendResult = rocketMQTemplate.syncSend(
                destination,
                MessageBuilder.withPayload(message).build(),
                5000,
                delayLevel);
The relationship between the delay level and the delay time
The corresponding relationship between other delay levels and specific delay times is as follows:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1s, 5s, 10s, 30s, 1m, 2m, 3m, 4m, 5m, 6m, 7m, 8m, 9m, 10m, 20m, 30m, 1h, 2h;

Consuming a message

This process is the same as that of general messages. No other actions are required.


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