Introducing Spring Framework

Chapter 20 ■ Your First Spring XD Application
@Bean
DirectExchange exchange() {
new DirectExchange("mydocuments")
}
@Bean
Binding binding(Queue queue, DirectExchange exchange) {
BindingBuilder
.bind(queue)
.to(exchange)
.with("docs-pdf")
}
@Bean
SimpleMessageListenerContainer container(CachingConnectionFactory connectionFactory) {
return new SimpleMessageListenerContainer(
connectionFactory: connectionFactory,
queueNames: [queueName],
messageListener: new MessageListenerAdapter(new Receiver(latch:latch), "receive")
)
}
void run(String... args) {
log.info "Sending Documents..."
500.times {
rabbitTemplate.convertAndSend(exchangeName, routingKey, "Document(id: ${it},
created: ${new Date().format('yyyy-MM-dd HH:mm:ss') })")
sleep 1000
}
}
}
@Log
class MyDocumentsConsumer {
}
def receive(String message) {
log.info "Document Received: ${message}"
}
Listing 20-1 shows a Spring Boot rabbitmq example that you can use. Take a look at the new annotation called
@EnableRabbitMessaging that will enable the Spring AMQP module into your Spring Boot application, and the
CommandLineRunner interface. This interface has the run method that you need to override; it will be the entry point
for your Spring Boot application. You can run this Spring Boot application by executing
spring run rabbitmqStream.groovy
After executing the above command, the application will send 500 messages (of course, you can change
this number to 1,000,0000 messages) and it will use a PDF as a routing key. The purpose of this example is just to
experience the power of Spring XD. Don’t forget while you are running this example to take a look at
http://localhost:9393/metrics/counters/pdfcount for the pdfcount value.
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