SimpleMessageListenerContainer
- Simple message listening container. This class is very powerful. We can set many settings for it. For message configuration items, this class can satisfy all requirements;
- Listen to the queue (multiple pairs), start automatically, and declare automatically
- Set transaction properties, transaction manager and transaction properties. Transaction capacity (concurrent), whether to start transaction, rollback message, etc
- Set the number of consumers, maximum and minimum quantity, mass consumption, etc
- Set message confirmation and automatic confirmation mode, whether to return to the queue, exception capture handler function
- Set consumer label generation policy, exclusive mode or not, consumer properties
- Set up specific listeners, message converters, etc
Be careful
SimpleMessageListenerContainer can be set dynamically, such as the number of its consumers and the mode of receiving messages. Many customized backend management consoles based on RabbitMQ are implemented according to this feature when they are dynamically set.
Code
package com.wyg.rabbitmq.springamqp; import org.springframework.amqp.core.AcknowledgeMode; import org.springframework.amqp.core.Message; import org.springframework.amqp.rabbit.connection.CachingConnectionFactory; import org.springframework.amqp.rabbit.connection.ConnectionFactory; import org.springframework.amqp.rabbit.core.RabbitAdmin; import org.springframework.amqp.rabbit.core.RabbitTemplate; import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer; import org.springframework.amqp.rabbit.listener.api.ChannelAwareMessageListener; import org.springframework.amqp.support.ConsumerTagStrategy; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import com.rabbitmq.client.Channel; /** * RabbitAdmin * * @author [email protected] * @date 2019-11-25 15:11 * @since JDK1.8 * @version V1.0 */ @Configuration public class RabbitConfig { @Bean public ConnectionFactory connectionFactory() { CachingConnectionFactory cachingConnectionFactory = new CachingConnectionFactory(); cachingConnectionFactory.setAddresses("localhost:5672"); cachingConnectionFactory.setUsername("guest"); cachingConnectionFactory.setPassword("guest"); cachingConnectionFactory.setVirtualHost("/"); return cachingConnectionFactory; } /** * SimpleMessageListenerContainer injection * * @param connectionFactory * @return * @throws @author * [email protected] * @date 2019/11/25 17:16 */ @Bean public SimpleMessageListenerContainer simpleMessageListenerContainer(ConnectionFactory connectionFactory) { SimpleMessageListenerContainer container = new SimpleMessageListenerContainer(connectionFactory); // Listen to multiple queue s container.addQueueNames("test01", "test02", "test03"); // Set current number of consumers container.setConcurrentConsumers(1); // Set the maximum number of consumers container.setMaxConcurrentConsumers(5); // Set do not return to queue container.setDefaultRequeueRejected(false); // Set up automatic sign in container.setAcknowledgeMode(AcknowledgeMode.AUTO); // Set the consumer tag strategy container.setConsumerTagStrategy(new ConsumerTagStrategy() { @Override public String createConsumerTag(String queue) { return queue + "_" + System.currentTimeMillis(); } }); // Set up monitoring container.setMessageListener(new ChannelAwareMessageListener() { @Override public void onMessage(Message message, Channel channel) throws Exception { // Message processing String msg = new String(message.getBody(), "UTF-8"); System.out.println("---Consumer---Team name:" + message.getMessageProperties().getConsumerQueue() + "，News:" + msg + ",deliveryTag: " + message.getMessageProperties().getDeliveryTag()); channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);; } }); return container; } }
unit testing
package com.wyg.rabbitmq.springamqp; import java.io.*; import java.lang.reflect.Field; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.amqp.core.*; import org.springframework.amqp.rabbit.core.RabbitAdmin; import org.springframework.amqp.rabbit.core.RabbitTemplate; import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.json.JsonMapper; import com.wyg.rabbitmq.springamqp.convert.Order; import com.wyg.rabbitmq.springamqp.convert.User; @RunWith(SpringRunner.class) @SpringBootTest public class RabbitConfigTest { @Autowired RabbitAdmin rabbitAdmin; @Autowired private RabbitTemplate rabbitTemplate; @Autowired private SimpleMessageListenerContainer simpleMessageListenerContainer; @Test public void testSimpleMessageListenerContainerSendMsg() { // Send messages to the queues "test01", "test02", "test03", respectively, "test01", "test02", // "test03" is bound to springdemo.direct. routingKey is orderRoutingKey for (int i = 0; i < 3; i++) { rabbitTemplate.convertAndSend("springdemo.direct", "orderRoutingKey", ("The first" + i + "Bar message").getBytes()); } } }