How camunda integrates message queue

Camunda can implement asynchronous processing tasks by integrating message queues. Common message queues include RabbitMQ, Kafka, and ActiveMQ. Here are the steps to integrate RabbitMQ:

1. Add RabbitMQ dependencies
Add RabbitMQ dependencies to the pom.xml file of the Camunda project:
org.springframework.boot spring-boot-starter-amqp

2. Configure RabbitMQ connection information
Configure RabbitMQ connection information in the application.properties file:

spring.rabbitmq.host=your-rabbitmq-host
spring.rabbitmq.port=your-rabbitmq-port
spring.rabbitmq.username=your-rabbitmq-username
spring.rabbitmq.password=your-rabbitmq-password

3. Configure asynchronous tasks
Use the @Async annotation to mark methods that need to be executed asynchronously, for example:

@Service
public class MyService {
@Async
public void processMessage(String message) {
// 处理消息
}
}

4. Send a message
Create a RabbitTemplate object where a message needs to be sent, and call its convertAndSend method to send a message:

@Autowired
private RabbitTemplate rabbitTemplate;

public void sendMessage(String message) {
rabbitTemplate.convertAndSend(“my-exchange”, “my-routing-key”, message);
}

5. Receive messages
Where you need to receive messages, create a listener and use the @RabbitListener annotation to mark the queue that needs to be monitored, for example:

@Component
public class MyListener {
@RabbitListener(queues = “my-queue”)
public void processMessage(String message) {
// 处理消息
}
}

The above is an example of integrating RabbitMQ, and the integration methods of other message queues are similar.