RabbitMQ separate listeners by type - spring

Question

I have POJO which represents a message to Rabbit MQ. There is an integer which is responsible for the type of the message(whether it's update, remove, add and so on):
public class Message {
private String field1;
private String field2;
private Integer type;
...
<some other fields>
}
I have a consumer which accepts such messages in my spring boot app. So in order to handle each type separately, I have to add some switch/case construction in my code.
Are there any more clear solutions for such case?

Answer 1

You can use Spring Integration with a router...
Rabbit Inbound channel adapter -> router ->
Where the router routes to a different service activator (method) based on the type.
EDIT
Here's an example:
#SpringBootApplication
public class So47272336Application {
public static void main(String[] args) {
SpringApplication.run(So47272336Application.class, args);
}
#Bean
public ApplicationRunner runner(RabbitTemplate rabbitTemplate) {
return args -> {
rabbitTemplate.convertAndSend("my.queue", new Domain(1, "foo"));
rabbitTemplate.convertAndSend("my.queue", new Domain(2, "bar"));
rabbitTemplate.convertAndSend("my.queue", new Domain(3, "baz"));
};
}
#Bean
public Queue queue() {
return new Queue("my.queue");
}
#Bean
public IntegrationFlow flow(ConnectionFactory connectionFactory) {
return IntegrationFlows.from(Amqp.inboundAdapter(connectionFactory, "my.queue"))
.route("payload.type", r -> r
.subFlowMapping("1", f -> f.handle("bean", "add"))
.subFlowMapping("2", f -> f.handle("bean", "remove"))
.subFlowMapping("3", f -> f.handle("bean", "update")))
.get();
}
#Bean
public MyBean bean() {
return new MyBean();
}
public static class MyBean {
public void add(Domain object) {
System.out.println("Adding " + object);
}
public void remove(Domain object) {
System.out.println("Removing " + object);
}
public void update(Domain object) {
System.out.println("Updating " + object);
}
}
public static class Domain implements Serializable {
private final Integer type;
private final String info;
public Domain(Integer type, String info) {
this.type = type;
this.info = info;
}
public Integer getType() {
return this.type;
}
public String getInfo() {
return this.info;
}
#Override
public String toString() {
return "Domain [type=" + this.type + ", info=" + this.info + "]";
}
}
}