L'exemple de code provient d'ici avec quelques modifications. Au moment de l'écriture, Spring Boot 3.3.0 (Spring Framework 6.1.8) est utilisé.
complete/pom.xml
Passer au courtier intégré ActiveMQ
<dependency> <groupId>org.springframework.boot</groupId> <!--<artifactId>spring-boot-starter-artemis</artifactId>--> <artifactId>spring-boot-starter-activemq</artifactId> </dependency> <dependency> <groupId>org.apache.activemq</groupId> <!--<artifactId>artemis-jakarta-server</artifactId>--> <artifactId>activemq-broker</artifactId> <scope>runtime</scope> </dependency> <!-- ... -->
complete/src/main/resources/application.properties
Activez la journalisation du débogage et configurez l'URL du courtier intégré
#spring.artemis.mode=embedded debug=true spring.activemq.broker-url=vm://localhost?broker.persistent=false
complete/src/main/java/hello/Application.java
Utilisez le bean JmsListenerContainerFactory créé par Spring Boot plutôt que construit par le nôtre
@SpringBootApplication @EnableJms public class Application { /*@Bean public JmsListenerContainerFactory<?> myFactory(ConnectionFactory connectionFactory, DefaultJmsListenerContainerFactoryConfigurer configurer) { DefaultJmsListenerContainerFactory factory = new DefaultJmsListenerContainerFactory(); // This provides all auto-configured defaults to this factory, including the message converter configurer.configure(factory, connectionFactory); // You could still override some settings if necessary. return factory; }*/ //... }
complete/src/main/java/hello/Receiver.java
Spécifiez la valeur par défaut JmsListenerContainerFactory
@Component public class Receiver { //@JmsListener(destination = "mailbox", containerFactory = "myFactory") @JmsListener(destination = "mailbox") public void receiveMessage(Email email) { System.out.println("Received <" + email + ">"); } }
Seule la configuration liée à JMS est affichée.
ActiveMQAutoConfiguration matched: - @ConditionalOnClass found required classes 'jakarta.jms.ConnectionFactory', 'org.apache.activemq.ActiveMQConnectionFactory' (OnClassCondition) - @ConditionalOnMissingBean (types: jakarta.jms.ConnectionFactory; SearchStrategy: all) did not find any beans (OnBeanCondition) ActiveMQAutoConfiguration#activemqConnectionDetails matched: - @ConditionalOnMissingBean (types: org.springframework.boot.autoconfigure.jms.activemq.ActiveMQConnectionDetails; SearchStrategy: all) did not find any beans (OnBeanCondition) ActiveMQConnectionFactoryConfiguration matched: - @ConditionalOnMissingBean (types: jakarta.jms.ConnectionFactory; SearchStrategy: all) did not find any beans (OnBeanCondition) ActiveMQConnectionFactoryConfiguration.SimpleConnectionFactoryConfiguration matched: - @ConditionalOnProperty (spring.activemq.pool.enabled=false) matched (OnPropertyCondition) ActiveMQConnectionFactoryConfiguration.SimpleConnectionFactoryConfiguration.CachingConnectionFactoryConfiguration matched: - @ConditionalOnClass found required class 'org.springframework.jms.connection.CachingConnectionFactory' (OnClassCondition) - @ConditionalOnProperty (spring.jms.cache.enabled=true) matched (OnPropertyCondition) JmsAnnotationDrivenConfiguration matched: - @ConditionalOnClass found required class 'org.springframework.jms.annotation.EnableJms' (OnClassCondition) JmsAnnotationDrivenConfiguration#jmsListenerContainerFactory matched: - @ConditionalOnSingleCandidate (types: jakarta.jms.ConnectionFactory; SearchStrategy: all) found a single bean 'jmsConnectionFactory'; @ConditionalOnMissingBean (names: jmsListenerContainerFactory; SearchStrategy: all) did not find any beans (OnBeanCondition) JmsAnnotationDrivenConfiguration#jmsListenerContainerFactoryConfigurer matched: - @ConditionalOnMissingBean (types: org.springframework.boot.autoconfigure.jms.DefaultJmsListenerContainerFactoryConfigurer; SearchStrategy: all) did not find any beans (OnBeanCondition) JmsAutoConfiguration matched: - @ConditionalOnClass found required classes 'jakarta.jms.Message', 'org.springframework.jms.core.JmsTemplate' (OnClassCondition) - @ConditionalOnBean (types: jakarta.jms.ConnectionFactory; SearchStrategy: all) found bean 'jmsConnectionFactory' (OnBeanCondition) JmsAutoConfiguration.JmsTemplateConfiguration#jmsTemplate matched: - @ConditionalOnSingleCandidate (types: jakarta.jms.ConnectionFactory; SearchStrategy: all) found a single bean 'jmsConnectionFactory'; @ConditionalOnMissingBean (types: org.springframework.jms.core.JmsOperations; SearchStrategy: all) did not find any beans (OnBeanCondition) JmsAutoConfiguration.MessagingTemplateConfiguration matched: - @ConditionalOnClass found required class 'org.springframework.jms.core.JmsMessagingTemplate' (OnClassCondition) JmsAutoConfiguration.MessagingTemplateConfiguration#jmsMessagingTemplate matched: - @ConditionalOnSingleCandidate (types: org.springframework.jms.core.JmsTemplate; SearchStrategy: all) found a single bean 'jmsTemplate'; @ConditionalOnMissingBean (types: org.springframework.jms.core.JmsMessageOperations; SearchStrategy: all) did not find any beans (OnBeanCondition)
Interface | Function |
---|---|
org.springframework.jms.support.destination.DestinationResolver | lookup jakarta.jms.Destination instance by String name |
org.springframework.transaction.jta.JtaTransactionManager | control transaction by JTA |
org.springframework.jms.support.converter.MessageConverter | serialize/deserialize DTO instance |
jakarta.jms.ExceptionListener | processor when jakarta.jms.JMSException throws. One implementation is SingleConnectionFactory, connection managed by that class will be restarted once exception is catched |
io.micrometer.observation.ObservationRegistry | for statistics |
L'implémentation d'ActiveMQ est org.apache.activemq.ActiveMQConnectionFactory, mais Spring Framework ne l'utilise pas directement. La classe est enveloppée par org.springframework.jms.connection.CachingConnectionFactory pour le suivi
Envoi d'un message via org.springframework.jms.core.JmsTemplate
<dependency> <groupId>org.springframework.boot</groupId> <!--<artifactId>spring-boot-starter-artemis</artifactId>--> <artifactId>spring-boot-starter-activemq</artifactId> </dependency> <dependency> <groupId>org.apache.activemq</groupId> <!--<artifactId>artemis-jakarta-server</artifactId>--> <artifactId>activemq-broker</artifactId> <scope>runtime</scope> </dependency> <!-- ... -->
JmsTemplate est construit par org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration.JmsTemplateConfiguration#jmsTemplate. Un bean MessageConverter est nécessaire pour désérialiser le DTO.
DestinationResolver utilisé est org.springframework.jms.support.destination.DynamicDestinationResolver, la classe obtient simplement l'instance de jakarta.jms.Destination en appelant jakarta.jms.Session#createTopic ou jakarta.jms.Session#createQueue.
attribute | Function |
---|---|
id | prefix of thread name which run listener |
containerFactory | bean name of JmsListenerContainerFactory instance |
destination | the destination name for this listener |
subscription | the name of the durable subscription, if any |
selector | an optional message selector for this listener |
concurrency | number of thread running listener |
Dans la spécification JMS, le traitement asynchrone des messages est pris en charge et l'écouteur s'exécute sous les threads du fournisseur JMS.
<dependency> <groupId>org.springframework.boot</groupId> <!--<artifactId>spring-boot-starter-artemis</artifactId>--> <artifactId>spring-boot-starter-activemq</artifactId> </dependency> <dependency> <groupId>org.apache.activemq</groupId> <!--<artifactId>artemis-jakarta-server</artifactId>--> <artifactId>activemq-broker</artifactId> <scope>runtime</scope> </dependency> <!-- ... -->
Mais les approches asynchrones ne sont pas utilisées dans Spring Framework, une API synchrone (polling) est utilisée. Le code réel se trouve dans org.springframework.jms.support.destination.JmsDestinationAccessor#receiveFromConsumer.
#spring.artemis.mode=embedded debug=true spring.activemq.broker-url=vm://localhost?broker.persistent=false
org.springframework.jms.listener.DefaultMessageListenerContainer.AsyncMessageListenerInvoker permet d'effectuer des tâches d'interrogation périodiques. Ceci est programmé dans org.springframework.core.task.SimpleAsyncTaskExecutor.
Une instance DefaultMessageListenerContainer est créée pour une fonction annotée @JmsListener. Ceci est produit par org.springframework.jms.config.DefaultJmsListenerContainerFactory.
Bien sûr, les instances MessageConverter et ExceptionListener sont nécessaires.
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