[英]create queue/exchange/binding/listener at run time in spring boot rabbitmq
I am using spring-boot with rabbitmq. 我在rabbitmq中使用spring-boot。 I have created some queues/exchanges/bindings/listeners which are fixed.
我创建了一些固定的队列/交换/绑定/侦听器。
listener is created as following: 侦听器的创建如下:
@RabbitListener
public void foo(String msg) {...}
Now i want to create queue at run time for every user whenever he login along with exchange/binding/listener and destroy these whenever user logout. 现在,我想在运行时为每个用户在与交换/绑定/侦听器一起登录时创建队列,并在用户注销时销毁这些队列。 How can i do this in spring-boot.
我如何在春季启动中做到这一点。
You can't easily do it with @RabbitListener
(you can, but you have to create a new child application context for each). 您无法使用
@RabbitListener
轻松完成此@RabbitListener
(可以,但是必须为每个应用程序创建一个新的子应用程序上下文)。
You can use a RabbitAdmin
to dynamically create the queues and bindings and create a message listener container for each new queue. 您可以使用
RabbitAdmin
动态创建队列和绑定,并为每个新队列创建消息侦听器容器。
EDIT 编辑
This is one way to do it with @RabbitListener
and child contexts; 这是使用
@RabbitListener
和子上下文的一种方法。 when using Spring Boot, the ListenerConfig
class must not be in the same package (or child package) as the boot application itself. 使用Spring Boot时,
ListenerConfig
类不得与引导应用程序本身位于同一软件包(或子软件包)中。
@SpringBootApplication
public class So48617898Application {
public static void main(String[] args) {
SpringApplication.run(So48617898Application.class, args).close();
}
private final Map<String, ConfigurableApplicationContext> children = new HashMap<>();
@Bean
public ApplicationRunner runner(RabbitTemplate template, ApplicationContext context) {
return args -> {
Scanner scanner = new Scanner(System.in);
String line = null;
while (true) {
System.out.println("Enter a new queue");
line = scanner.next();
if ("quit".equals(line)) {
break;
}
children.put(line, addNewListener(line, context));
template.convertAndSend(line, "test to " + line);
}
scanner.close();
for (ConfigurableApplicationContext ctx : this.children.values()) {
ctx.stop();
}
};
}
private ConfigurableApplicationContext addNewListener(String queue, ApplicationContext context) {
AnnotationConfigApplicationContext child = new AnnotationConfigApplicationContext();
child.setParent(context);
ConfigurableEnvironment environment = child.getEnvironment();
Properties properties = new Properties();
properties.setProperty("queue.name", queue);
PropertiesPropertySource pps = new PropertiesPropertySource("props", properties);
environment.getPropertySources().addLast(pps);
child.register(ListenerConfig.class);
child.refresh();
return child;
}
}
and 和
@Configuration
@EnableRabbit
public class ListenerConfig {
@RabbitListener(queues = "${queue.name}")
public void listen(String in, @Header(AmqpHeaders.CONSUMER_QUEUE) String queue) {
System.out.println("Received " + in + " from queue " + queue);
}
@Bean
public Queue queue(@Value("${queue.name}") String name) {
return new Queue(name);
}
@Bean
public RabbitAdmin admin(ConnectionFactory cf) {
return new RabbitAdmin(cf);
}
}
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