一、背景
最近项目中需要用到了RabbitMQ来监听消息队列，监听的消息队列的 虚拟主机(virtualHost)和队列名(queueName)是不一致的，但是接收到的消息格式相同的。而且可能还存在程序不停机的情况下，动态的增加新的队列(queue)的监听，因此就需要我们自己在程序中实现一种方法实现动态配置RabbitMQ。
二、需求
我们有2个RabbitMQ的配置，在程序启动的时候，动态的配置好这2个RabbitMQ，实现消息的监听。
RabbitMQ的配置信息
host | port | username | password | virtualHost | queueName |
47.101.130.164 | 5672 | rabbit-multi-01 | rabbit-multi-01 | /rabbit-multi-01 | queue-rabbit-multi-01 |
47.101.130.164 | 5672 | rabbit-multi-02 | rabbit-multi-02 | /rabbit-multi-02 | queue-rabbit-multi-02 |
三、实现思路
1、动态配置RabbitMQ
包括 ConnectionFactory,RabbitAdmin,RabbitTemplate,SimpleMessageListenerContainer等
2、将上方配置好的Bean注入到Spring容器中，之后可能需要用到
向Spring容器中注入Bean的方法
DefaultListableBeanFactory#registerSingletonDefaultListableBeanFactory#registerBeanDefinition四、实现步骤
1、引入maven依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>2、创建RabbitProperties用来表示RabbitMQ的配置信息
public class RabbitProperties {
private String host;
private Integer port;
private String username;
private String password;
private String virtualHost;
private String queueName;
}3、配置RabbitMQ
配置 ConnectionFactory,RabbitAdmin,RabbitTemplate,SimpleMessageListenerContainer等，并动态注入到Spring容器中
public class MultiRabbitMqConfig {
private final DefaultListableBeanFactory defaultListableBeanFactory;
private static Map<String, RabbitProperties> multiMqPropertiesMap = new HashMap<String, RabbitProperties>() {
{
put("first", RabbitProperties.builder()
.host("47.101.130.164")
.port(5672)
.username("rabbit-multi-01")
.password("rabbit-multi-01")
.virtualHost("/rabbit-multi-01")
.queueName("queue-rabbit-multi-01").build());
put("second", RabbitProperties.builder()
.host("47.101.130.164")
.port(5672)
.username("rabbit-multi-02")
.password("rabbit-multi-02")
.virtualHost("/rabbit-multi-02")
.queueName("queue-rabbit-multi-02").build());
}
};
public void initRabbitmq() {
multiMqPropertiesMap.forEach((key, rabbitProperties) -> {
AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.genericBeanDefinition(CachingConnectionFactory.class)
.addPropertyValue("cacheMode", CachingConnectionFactory.CacheMode.CHANNEL)
.addPropertyValue("host", rabbitProperties.getHost())
.addPropertyValue("port", rabbitProperties.getPort())
.addPropertyValue("username", rabbitProperties.getUsername())
.addPropertyValue("password", rabbitProperties.getPassword())
.addPropertyValue("virtualHost", rabbitProperties.getVirtualHost())
.getBeanDefinition();
String connectionFactoryName = String.format("%s%s", key, "ConnectionFactory");
defaultListableBeanFactory.registerBeanDefinition(connectionFactoryName, beanDefinition);
CachingConnectionFactory connectionFactory = defaultListableBeanFactory.getBean(connectionFactoryName, CachingConnectionFactory.class);
String rabbitAdminName = String.format("%s%s", key, "RabbitAdmin");
AbstractBeanDefinition rabbitAdminBeanDefinition = BeanDefinitionBuilder.genericBeanDefinition(RabbitAdmin.class)
.addConstructorArgValue(connectionFactory)
.addPropertyValue("autoStartup", true)
.getBeanDefinition();
defaultListableBeanFactory.registerBeanDefinition(rabbitAdminName, rabbitAdminBeanDefinition);
RabbitAdmin rabbitAdmin = defaultListableBeanFactory.getBean(rabbitAdminName, RabbitAdmin.class);
log.info("rabbitAdmin:[{}]", rabbitAdmin);
RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
defaultListableBeanFactory.registerSingleton(String.format("%s%s", key, "RabbitTemplate"), rabbitTemplate);
SimpleMessageListenerContainer simpleMessageListenerContainer = new SimpleMessageListenerContainer(connectionFactory);
// 设置监听的队列
simpleMessageListenerContainer.setQueueNames(rabbitProperties.getQueueName());
// 指定要创建的并发使用者的数量,默认值是1,当并发高时可以增加这个的数值，同时下方max的数值也要增加
simpleMessageListenerContainer.setConcurrentConsumers(3);
// 最大的并发消费者
simpleMessageListenerContainer.setMaxConcurrentConsumers(10);
// 设置是否重回队列
simpleMessageListenerContainer.setDefaultRequeueRejected(false);
// 设置签收模式
simpleMessageListenerContainer.setAcknowledgeMode(AcknowledgeMode.MANUAL);
// 设置非独占模式
simpleMessageListenerContainer.setExclusive(false);
// 设置consumer未被 ack 的消息个数
simpleMessageListenerContainer.setPrefetchCount(1);
// 设置消息监听器
simpleMessageListenerContainer.setMessageListener((ChannelAwareMessageListener) (message, channel) -> {
try {
log.info("============> Thread:[{}] 接收到消息:[{}] ", Thread.currentThread().getName(), new String(message.getBody()));
log.info("====>connection:[{}]", channel.getConnection());
channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
} catch (Exception e) {
log.error(e.getMessage(), e);
// 发生异常此处需要捕获到
channel.basicNack(message.getMessageProperties().getDeliveryTag(), false, true);
}
});
/**
* 1、simpleMessageListenerContainer.start();
* 2、simpleMessageListenerContainer.stop();
* 3、如果后期rabbitmq 的配置是从数据库中读取，即用户在页面上添加一个配置，就动态创建这个
* 此时就需要调用 SimpleMessageListenerContainer#start 方法
*/
defaultListableBeanFactory.registerSingleton(String.format("%s%s", key, "SimpleMessageListenerContainer"), simpleMessageListenerContainer);
});
new Thread(() -> {
try {
TimeUnit.SECONDS.sleep(3);
} catch (InterruptedException e) {
e.printStackTrace();
}
RabbitTemplate firstRabbitTemplate = (RabbitTemplate) defaultListableBeanFactory.getBean("firstRabbitTemplate");
firstRabbitTemplate.convertAndSend("exchange-rabbit-multi-01", "", "first queue message");
log.info("over...");
}).start();
}
}五、实现效果
六、代码
https://gitee.com/huan1993/rabbitmq/tree/master/rabbitmq-springboot-multi
