package stream.producer.gateway;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.http.ResponseEntity;
import org.springframework.integration.annotation.Gateway;
import org.springframework.integration.annotation.IntegrationComponentScan;
import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import stream.producer.ProducerChannels;
@SpringBootApplication
@EnableBinding(ProducerChannels.class)
// <1>
@IntegrationComponentScan
// <2>
public class StreamProducer {
public static void main(String args[]) {
SpringApplication.run(StreamProducer.class, args);
}
}
// <3>
@MessagingGateway
interface GreetingGateway {
@Gateway(requestChannel = ProducerChannels.BROADCAST)
void broadcastGreet(String msg);
@Gateway(requestChannel = ProducerChannels.DIRECT)
void directGreet(String msg);
}
@RestController
class GreetingProducer {
private final GreetingGateway gateway;
// <4>
@Autowired
GreetingProducer(GreetingGateway gateway) {
this.gateway = gateway;
}
@RequestMapping(method = RequestMethod.GET, value = "/hi/{name}")
ResponseEntity<?> hi(@PathVariable String name) {
String message = "Hello, " + name + "!";
this.gateway.directGreet("Direct: " + message);
this.gateway.broadcastGreet("Broadcast: " + message);
return ResponseEntity.ok(message);
}
}
