RocketMQ Example

Project Instruction

This example illustrates how to use RocketMQ Binder implement pub/sub messages for Spring Cloud applications.

RocketMQ is a distributed messaging and streaming platform with low latency, high performance and reliability, trillion-level capacity and flexible scalability.

Before we start the demo, let's look at Spring Cloud Stream.

Spring Cloud Stream is a framework for building message-driven microservice applications. Spring Cloud Stream builds upon Spring Boot to create standalone, production-grade Spring applications and uses Spring Integration to provide connectivity to message brokers. It provides opinionated configuration of middleware from several vendors, introducing the concepts of persistent publish-subscribe semantics, consumer groups, and partitions.

There are two concepts in Spring Cloud Stream: Binder 和 Binding.

Binder: A strategy interface used to bind an app interface to a logical name.

Binder Implementations includes KafkaMessageChannelBinder of kafka, RabbitMessageChannelBinder of RabbitMQ and RocketMQMessageChannelBinder of RocketMQ.

Binding: Including Input Binding and Output Binding.

Binding is Bridge between the external messaging systems and application provided Producers and Consumers of messages.

This is a overview of Spring Cloud Stream.

Preparation

Download and Startup RocketMQ

You should startup Name Server and Broker before using RocketMQ Binder.

Download RocketMQ and unzip it.
Startup Name Server

sh bin/mqnamesrv

Startup Broker

sh bin/mqbroker -n localhost:9876

Declare dependency

Add dependency spring-cloud-starter-stream-rocketmq to the pom.xml file in your Spring Cloud project.

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-stream-rocketmq</artifactId>
</dependency>

Simple example

Create topic

sh bin/mqadmin updateTopic -n localhost:9876 -c DefaultCluster -t test-topic

Integration with RocketMQ Binder

Configure Input and Output Binding and cooperate with @EnableBinding annotation

@SpringBootApplication
@EnableBinding({ Source.class, Sink.class })
public class RocketMQApplication {
	public static void main(String[] args) {
		SpringApplication.run(RocketMQApplication.class, args);
	}
}

Configure Binding:

# configure the nameserver of rocketmq
spring.cloud.stream.rocketmq.binder.name-server=127.0.0.1:9876
# configure the output binding named output
spring.cloud.stream.bindings.output.destination=test-topic
spring.cloud.stream.bindings.output.content-type=application/json
# configure the input binding named input
spring.cloud.stream.bindings.input.destination=test-topic
spring.cloud.stream.bindings.input.content-type=application/json
spring.cloud.stream.bindings.input.group=test-group

Start Application

Add necessary configurations to file /src/main/resources/application.properties.

spring.application.name=rocketmq-example
server.port=28081

Start the application in IDE or by building a fatjar.
1. Start in IDE: Find main class RocketMQApplication, and execute the main method.
2. Build a fatjar: Execute command mvn clean package to build a fatjar, and run command java -jar rocketmq-example.jar to start the application.

Message Handle

Using the binding named output and sent messages to test-topic topic.

And using two input bindings to subscribe messages.

input1: subscribe the message of test-topic topic and consume ordered messages(all messages should in the same MessageQueue if you want to consuming ordered messages).
input2: subscribe the message of test-topic topic and consume concurrent messages which tags is tagStr, the thread number in pool is 20 in Consumer side.

see the configuration below:

spring.cloud.stream.rocketmq.binder.name-server=127.0.0.1:9876

spring.cloud.stream.bindings.output.destination=test-topic
spring.cloud.stream.bindings.output.content-type=application/json

spring.cloud.stream.bindings.input1.destination=test-topic
spring.cloud.stream.bindings.input1.content-type=text/plain
spring.cloud.stream.bindings.input1.group=test-group1
spring.cloud.stream.rocketmq.bindings.input1.consumer.orderly=true

spring.cloud.stream.bindings.input2.destination=test-topic
spring.cloud.stream.bindings.input2.content-type=text/plain
spring.cloud.stream.bindings.input2.group=test-group2
spring.cloud.stream.rocketmq.bindings.input2.consumer.orderly=false
spring.cloud.stream.rocketmq.bindings.input2.consumer.tags=tagStr
spring.cloud.stream.bindings.input2.consumer.concurrency=20

Pub Messages

Using MessageChannel to send messages:

public class ProducerRunner implements CommandLineRunner {
    @Autowired
    private MessageChannel output;
    @Override
    public void run(String... args) throws Exception {
        Map<String, Object> headers = new HashMap<>();
        headers.put(MessageConst.PROPERTY_TAGS, "tagStr");
        Message message = MessageBuilder.createMessage(msg, new MessageHeaders(headers));
        output.send(message);
    }
}

Or you can using the native API of RocketMQ to send messages:

public class RocketMQProducer {
    DefaultMQProducer producer = new DefaultMQProducer("producer_group");
    producer.setNamesrvAddr("127.0.0.1:9876");
    producer.start();
    
    Message msg = new Message("test-topic", "tagStr", "message from rocketmq producer".getBytes());
    producer.send(msg);
}

Sub Messages

Using @StreamListener to receive messages:

@Service
public class ReceiveService {

	@StreamListener("input1")
	public void receiveInput1(String receiveMsg) {
		System.out.println("input1 receive: " + receiveMsg);
	}

	@StreamListener("input2")
	public void receiveInput2(String receiveMsg) {
		System.out.println("input2 receive: " + receiveMsg);
	}

}

Broadcasting exmaple

Create topic

sh bin/mqadmin updateTopic -n localhost:9876 -c DefaultCluster -t broadcast

Producer

application.yml

server:
  port: 28085
spring:
  application:
    name: rocketmq-broadcast-producer-example
  cloud:
    stream:
      rocketmq:
        binder:
          name-server: localhost:9876
        bindings:
          producer-out-0:
            producer:
              group: output_1
      bindings:
        producer-out-0:
          destination: broadcast
logging:
  level:
    org.springframework.context.support: debug

code

Use ApplicationRunner and StreamBridge to send messages.

@SpringBootApplication
public class RocketMQBroadcastProducerApplication {
   private static final Logger log = LoggerFactory
         .getLogger(RocketMQBroadcastProducerApplication.class);
   @Autowired
   private StreamBridge streamBridge;
   public static void main(String[] args) {
      SpringApplication.run(RocketMQBroadcastProducerApplication.class, args);
   }

   @Bean
   public ApplicationRunner producer() {
      return args -> {
         for (int i = 0; i < 100; i++) {
            String key = "KEY" + i;
            Map<String, Object> headers = new HashMap<>();
            headers.put(MessageConst.PROPERTY_KEYS, key);
            headers.put(MessageConst.PROPERTY_ORIGIN_MESSAGE_ID, i);
            Message<SimpleMsg> msg = new GenericMessage<SimpleMsg>(new SimpleMsg("Hello RocketMQ " + i), headers);
            streamBridge.send("producer-out-0", msg);
         }
      };
   }
}

Consumer

Startup two consumers.

Consumer1

application.yml

server:
  port: 28084
spring:
  application:
    name: rocketmq-broadcast-consumer1-example
  cloud:
    stream:
      function:
        definition: consumer;
      rocketmq:
        binder:
          name-server: localhost:9876
        bindings:
          consumer-in-0:
            consumer:
              messageModel: BROADCASTING
      bindings:
        consumer-in-0:
          destination: broadcast
          group: broadcast-consumer
logging:
  level:
    org.springframework.context.support: debug

code

@SpringBootApplication
public class RocketMQBroadcastConsumer1Application {
   private static final Logger log = LoggerFactory
         .getLogger(RocketMQBroadcastConsumer1Application.class);

   public static void main(String[] args) {
      SpringApplication.run(RocketMQBroadcastConsumer1Application.class, args);
   }

   @Bean
   public Consumer<Message<SimpleMsg>> consumer() {
      return msg -> {
         log.info(Thread.currentThread().getName() + " Consumer1 Receive New Messages: " + msg.getPayload().getMsg());
      };
   }
}

Consumer2

application.yml

server:
  port: 28083
spring:
  application:
    name: rocketmq-broadcast-consumer2-example
  cloud:
    stream:
      function:
        definition: consumer;
      rocketmq:
        binder:
          name-server: localhost:9876
        bindings:
          consumer-in-0:
            consumer:
              messageModel: BROADCASTING
      bindings:
        consumer-in-0:
          destination: broadcast
          group: broadcast-consumer
logging:
  level:
    org.springframework.context.support: debug

code

@SpringBootApplication
public class RocketMQBroadcastConsumer2Application {
   private static final Logger log = LoggerFactory
         .getLogger(RocketMQBroadcastConsumer2Application.class);

   public static void main(String[] args) {
      SpringApplication.run(RocketMQBroadcastConsumer2Application.class, args);
   }

   @Bean
   public Consumer<Message<SimpleMsg>> consumer() {
      return msg -> {
         log.info(Thread.currentThread().getName() + " Consumer2 Receive New Messages: " + msg.getPayload().getMsg());
      };
   }
}

Order example

RocketMQ provides ordered messages using FIFO order.

There are two types of ordered messages.

Global: For a specified topic, all messages are published and consumed in strict FIFO (First In First Out) order.
Partition: For a specified topic, all messages are partitioned according to the Sharding Key. Messages within the same partition are published and consumed in strict FIFO order. Sharding Key is a key field used to distinguish different partitions in sequential messages, and it is a completely different concept from the Key of ordinary messages.

Create Topic

sh bin/mqadmin updateTopic -n localhost:9876 -c DefaultCluster -t orderly

Example code

application.yml

server:
  port: 28082
spring:
  application:
    name: rocketmq-orderly-consume-example
  cloud:
    stream:
      function:
        definition: consumer;
      rocketmq:
        binder:
          name-server: localhost:9876
        bindings:
          producer-out-0:
            producer:
              group: output_1
              # 定义messageSelector
              messageQueueSelector: orderlyMessageQueueSelector
          consumer-in-0:
            consumer:
              # tag: {@code tag1||tag2||tag3 }; sql: {@code 'color'='blue' AND 'price'>100 } .
              subscription: 'TagA || TagC || TagD'
              push:
                orderly: true
      bindings:
        producer-out-0:
          destination: orderly
        consumer-in-0:
          destination: orderly
          group: orderly-consumer

logging:
  level:
    org.springframework.context.support: debug

MessageQueueSelector

Choose a partition selection algorithm for you, and ensure that the same parameters get the same results.

@Component
public class OrderlyMessageQueueSelector implements MessageQueueSelector {
   private static final Logger log = LoggerFactory
         .getLogger(OrderlyMessageQueueSelector.class);
   @Override
   public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
      Integer id = (Integer) ((MessageHeaders) arg).get(MessageConst.PROPERTY_ORIGIN_MESSAGE_ID);
      String tag = (String) ((MessageHeaders) arg).get(MessageConst.PROPERTY_TAGS);
      int index = id % RocketMQOrderlyConsumeApplication.tags.length % mqs.size();
      return mqs.get(index);
   }
}

Producer&Consumer

@SpringBootApplication
public class RocketMQOrderlyConsumeApplication {
   private static final Logger log = LoggerFactory
         .getLogger(RocketMQOrderlyConsumeApplication.class);

   @Autowired
   private StreamBridge streamBridge;

   /***
    * tag array.
    */
   public static final String[] tags = new String[] {"TagA", "TagB", "TagC", "TagD", "TagE"};

   public static void main(String[] args) {
      SpringApplication.run(RocketMQOrderlyConsumeApplication.class, args);
   }

   @Bean
   public ApplicationRunner producer() {
      return args -> {
         for (int i = 0; i < 100; i++) {
            String key = "KEY" + i;
            Map<String, Object> headers = new HashMap<>();
            headers.put(MessageConst.PROPERTY_KEYS, key);
            headers.put(MessageConst.PROPERTY_TAGS, tags[i % tags.length]);
            headers.put(MessageConst.PROPERTY_ORIGIN_MESSAGE_ID, i);
            Message<SimpleMsg> msg = new GenericMessage(new SimpleMsg("Hello RocketMQ " + i), headers);
            streamBridge.send("producer-out-0", msg);
         }
      };
   }

   @Bean
   public Consumer<Message<SimpleMsg>> consumer() {
      return msg -> {
         String tagHeaderKey = RocketMQMessageConverterSupport.toRocketHeaderKey(
               MessageConst.PROPERTY_TAGS).toString();
         log.info(Thread.currentThread().getName() + " Receive New Messages: " + msg.getPayload().getMsg() + " TAG:" +
               msg.getHeaders().get(tagHeaderKey).toString());
         try {
            Thread.sleep(100);
         }
         catch (InterruptedException ignored) {
         }
      };
   }

}

Schedule example

Scheduled messages differ from normal messages in that they won’t be delivered until a provided time later.

Create topic

sh bin/mqadmin updateTopic -n localhost:9876 -c DefaultCluster -t delay

Example code

application.yml

server:
  port: 28086
spring:
  application:
    name: rocketmq-delay-consume-example
  cloud:
    stream:
      function:
        definition: consumer;
      rocketmq:
        binder:
          name-server: localhost:9876
        bindings:
          producer-out-0:
            producer:
              group: output_1
      bindings:
        producer-out-0:
          destination: delay
        consumer-in-0:
          destination: delay
          group: delay-group
logging:
  level:
    org.springframework.context.support: debug

code

@SpringBootApplication
public class RocketMQDelayConsumeApplication {
   private static final Logger log = LoggerFactory
         .getLogger(RocketMQDelayConsumeApplication.class);
   @Autowired
   private StreamBridge streamBridge;

   public static void main(String[] args) {
      SpringApplication.run(RocketMQDelayConsumeApplication.class, args);
   }

   @Bean
   public ApplicationRunner producerDelay() {
      return args -> {
         for (int i = 0; i < 100; i++) {
            String key = "KEY" + i;
            Map<String, Object> headers = new HashMap<>();
            headers.put(MessageConst.PROPERTY_KEYS, key);
            headers.put(MessageConst.PROPERTY_ORIGIN_MESSAGE_ID, i);
   			// Set the delay level 1~10
			 headers.put(MessageConst.PROPERTY_DELAY_TIME_LEVEL, 2);
            Message<SimpleMsg> msg = new GenericMessage(new SimpleMsg("Delay RocketMQ " + i), headers);
            streamBridge.send("producer-out-0", msg);
         }
      };
   }

   @Bean
   public Consumer<Message<SimpleMsg>> consumer() {
      return msg -> {
         log.info(Thread.currentThread().getName() + " Consumer Receive New Messages: " + msg.getPayload().getMsg());
      };
   }
}

Filter example

Create topic

sh bin/mqadmin updateTopic -n localhost:9876 -c DefaultCluster -t sql

Example code

application.yml

RocketMQ stream binder supports filter by tag or sql, just setting spring.cloud.stream.rocketmq.bindings.<channelName>.consumer.subscription.

Tag example: tag:red || blue

Sql example: sql:(color in ('red1', 'red2', 'red4') and price>3)

More: Filter

server:
  port: 28087
spring:
  application:
    name: rocketmq-sql-consume-example
  cloud:
    stream:
      function:
        definition: consumer;
      rocketmq:
        binder:
          name-server: localhost:9876
        bindings:
          producer-out-0:
            producer:
              group: output_1
          consumer-in-0:
            consumer:
              # tag: {@code tag1||tag2||tag3 }; sql: {@code 'color'='blue' AND 'price'>100 } .
              subscription: sql:(color in ('red1', 'red2', 'red4') and price>3)
      bindings:
        producer-out-0:
          destination: sql
        consumer-in-0:
          destination: sql
          group: sql-group
logging:
  level:
    org.springframework.context.support: debug

code

@SpringBootApplication
public class RocketMQSqlConsumeApplication {
   private static final Logger log = LoggerFactory
         .getLogger(RocketMQSqlConsumeApplication.class);
   @Autowired
   private StreamBridge streamBridge;
   public static void main(String[] args) {
      SpringApplication.run(RocketMQSqlConsumeApplication.class, args);
   }

   /**
    * color array.
    */
   public static final String[] color = new String[] {"red1", "red2", "red3", "red4", "red5"};

   /**
    * price array.
    */
   public static final Integer[] price = new Integer[] {1, 2, 3, 4, 5};

   @Bean
   public ApplicationRunner producer() {
      return args -> {
         for (int i = 0; i < 100; i++) {
            String key = "KEY" + i;
            Map<String, Object> headers = new HashMap<>();
            headers.put(MessageConst.PROPERTY_KEYS, key);
            headers.put("color", color[i % color.length]);
            headers.put("price", price[i % price.length]);
            headers.put(MessageConst.PROPERTY_ORIGIN_MESSAGE_ID, i);
            Message<SimpleMsg> msg = new GenericMessage(new SimpleMsg("Hello RocketMQ " + i), headers);
            streamBridge.send("producer-out-0", msg);
         }
      };
   }

   @Bean
   public Consumer<Message<SimpleMsg>> consumer() {
      return msg -> {
         String colorHeaderKey = "color";
         String priceHeaderKey = "price";
         log.info(Thread.currentThread().getName() + " Receive New Messages: " + msg.getPayload().getMsg() + " COLOR:" +
               msg.getHeaders().get(colorHeaderKey).toString() + " " +
               "PRICE: " + msg.getHeaders().get(priceHeaderKey).toString());
      };
   }
}

常见问题

MQClientException: The broker does not support consumer to filter message by SQL92

Modify RocketMQ server configuration file. In the conf/2m-2s-async/broker-a.properties configuration file, add enablePropertyFilter=true.
Restart mqbroker and specify the configuration file. Specify the configuration file when mqbroker starts: conf/2m-2s-async/broker-a.properties, for example:

bin/mqbroker -n 127.0.0.1:9876 -c conf/2m-2s-async/broker-a.properties autoCreateTopicEnable=true

Transaction example

What is transactional message?

Refer to Transaction Example.

It can be thought of as a two-phase commit message implementation to ensure eventual consistency in distributed system. Transactional message ensures that the execution of local transaction and the sending of message can be performed atomically.

Application

1、 Transactional status

There are three states for transactional message: (1) TransactionStatus.CommitTransaction: commit transaction，it means that allow consumers to consume this message. (2) TransactionStatus.RollbackTransaction: rollback transaction，it means that the message will be deleted and not allowed to consume. (3) TransactionStatus.Unknown: intermediate state，it means that MQ is needed to check back to determine the status.

Create topic

sh bin/mqadmin updateTopic -n localhost:9876 -c DefaultCluster -t tx

Example code

application.yml

server:
  port: 28088
spring:
  application:
    name: rocketmq-tx-example
  cloud:
    stream:
      function:
        definition: consumer;
      rocketmq:
        binder:
          name-server: localhost:9876
        bindings:
          producer-out-0:
            producer:
              group: output_1
              transactionListener: myTransactionListener
              producerType: Trans
      bindings:
        producer-out-0:
          destination: tx
        consumer-in-0:
          destination: tx
          group: tx-group
logging:
  level:
    org.springframework.context.support: debug

TransactionListenerImpl

To execute local transaction.

@Component("myTransactionListener")
public class TransactionListenerImpl implements TransactionListener {

	@Override
	public LocalTransactionState executeLocalTransaction(Message msg, Object arg) {
		Object num = msg.getProperty("test");

		if ("1".equals(num)) {
			System.out.println("executer: " + new String(msg.getBody()) + " unknown");
			return LocalTransactionState.UNKNOW;
		}
		else if ("2".equals(num)) {
			System.out.println("executer: " + new String(msg.getBody()) + " rollback");
			return LocalTransactionState.ROLLBACK_MESSAGE;
		}
		System.out.println("executer: " + new String(msg.getBody()) + " commit");
		return LocalTransactionState.COMMIT_MESSAGE;
	}

	@Override
	public LocalTransactionState checkLocalTransaction(MessageExt msg) {
		System.out.println("check: " + new String(msg.getBody()));
		return LocalTransactionState.COMMIT_MESSAGE;
	}

}

producer and consumer

@SpringBootApplication
public class RocketMQTxApplication {
	private static final Logger log = LoggerFactory
			.getLogger(RocketMQTxApplication.class);
	@Autowired
	private StreamBridge streamBridge;
	public static void main(String[] args) {
		SpringApplication.run(RocketMQTxApplication.class, args);
	}


	@Bean
	public ApplicationRunner producer() {
		return args -> {
			for (int i = 1; i <= 4; i++) {
				MessageBuilder builder = MessageBuilder.withPayload(new SimpleMsg("Hello Tx msg " + i));
				builder.setHeader("test", String.valueOf(i))
						.setHeader(MessageHeaders.CONTENT_TYPE, MimeTypeUtils.APPLICATION_JSON);
				builder.setHeader(RocketMQConst.USER_TRANSACTIONAL_ARGS, "binder");
				Message<SimpleMsg> msg = builder.build();
				streamBridge.send("producer-out-0", msg);
				System.out.println("send Msg:" + msg.toString());
			}
		};
	}

	@Bean
	public Consumer<Message<SimpleMsg>> consumer() {
		return msg -> {
			Object arg = msg.getHeaders();
			log.info(Thread.currentThread().getName() + " Receive New Messages: " + msg.getPayload().getMsg() + " ARG:"
				+ arg.toString());
		};
	}
}

Endpoint

Add dependency spring-cloud-starter-stream-rocketmq to your pom.xml file, and configure your endpoint security strategy.

Spring Boot1.x: Add configuration management.security.enabled=false
Spring Boot2.x: Add configuration management.endpoints.web.exposure.include=*

To view the endpoint information, visit the following URLS:

Spring Boot1.x: Sentinel Endpoint URL is http://127.0.0.1:18083/rocketmq_binder.
Spring Boot2.x: Sentinel Endpoint URL is http://127.0.0.1:18083/actuator/rocketmq-binder.

Endpoint will metrics some data like last send timestamp, sending or receive message successfully times or unsuccessfully times.

{
	"runtime": {
		"lastSend.timestamp": 1542786623915
	},
	"metrics": {
		"scs-rocketmq.consumer.test-topic.totalConsumed": {
			"count": 11
		},
		"scs-rocketmq.consumer.test-topic.totalConsumedFailures": {
			"count": 0
		},
		"scs-rocketmq.producer.test-topic.totalSentFailures": {
			"count": 0
		},
		"scs-rocketmq.consumer.test-topic.consumedPerSecond": {
			"count": 11,
			"fifteenMinuteRate": 0.012163847780107841,
			"fiveMinuteRate": 0.03614605351360527,
			"meanRate": 0.3493213353657594,
			"oneMinuteRate": 0.17099243039490175
		},
		"scs-rocketmq.producer.test-topic.totalSent": {
			"count": 5
		},
		"scs-rocketmq.producer.test-topic.sentPerSecond": {
			"count": 5,
			"fifteenMinuteRate": 0.005540151995103271,
			"fiveMinuteRate": 0.01652854617838251,
			"meanRate": 0.10697493212602836,
			"oneMinuteRate": 0.07995558537067671
		},
		"scs-rocketmq.producer.test-topic.sentFailuresPerSecond": {
			"count": 0,
			"fifteenMinuteRate": 0.0,
			"fiveMinuteRate": 0.0,
			"meanRate": 0.0,
			"oneMinuteRate": 0.0
		},
		"scs-rocketmq.consumer.test-topic.consumedFailuresPerSecond": {
			"count": 0,
			"fifteenMinuteRate": 0.0,
			"fiveMinuteRate": 0.0,
			"meanRate": 0.0,
			"oneMinuteRate": 0.0
		}
	}
}

Note: You should add metrics-core dependency if you want to see metrics data. endpoint will show warning information if you don't add that dependency:

{
    "warning": "please add metrics-core dependency, we use it for metrics"
}

More

For more information about RocketMQ, see RocketMQ Project.

If you have any ideas or suggestions for Spring Cloud RocketMQ Binder, please don't hesitate to tell us by submitting github issues.

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readme.md

readme.md

RocketMQ Example

Project Instruction

Preparation

Download and Startup RocketMQ

Declare dependency

Simple example

Create topic

Integration with RocketMQ Binder

Start Application

Message Handle

Pub Messages

Sub Messages

Broadcasting exmaple

Create topic

Producer

Consumer

Consumer1

Consumer2

Order example

Create Topic

Example code

Schedule example

Create topic

Example code

Filter example

Create topic

Example code

常见问题

Transaction example

What is transactional message?

Application

Create topic

Example code

Endpoint

More

Files

readme.md

Latest commit

History

readme.md

File metadata and controls

RocketMQ Example

Project Instruction

Preparation

Download and Startup RocketMQ

Declare dependency

Simple example

Create topic

Integration with RocketMQ Binder

Start Application

Message Handle

Pub Messages

Sub Messages

Broadcasting exmaple

Create topic

Producer

Consumer

Consumer1

Consumer2

Order example

Create Topic

Example code

Schedule example

Create topic

Example code

Filter example

Create topic

Example code

常见问题

Transaction example

What is transactional message?

Application

Create topic

Example code

Endpoint

More