Spring Cloud Stream and @Publisher annotation compatiblity

Question

Since Spring Cloud Stream has not an annotation for sending a new message to a stream (@SendTo only works when @StreamListener is declared), I tried to use Spring Integratio

Answer 1

Why not just send the message to a stream manually, like below.

@Component
@Configuration
@EnableBinding(Processor.class)
public class Sender {

    @Autowired
    private Processor processor;

    public void send(String message) {

        processor.output().send(MessageBuilder.withPayload(message).build());

    }

}

You can test it through the tester.

@SpringBootTest
public class SenderTest {

    @Autowired
    private MessageCollector messageCollector;

    @Autowired
    private Processor processor;

    @Autowired
    private Sender sender;

    @SuppressWarnings("unchecked")
    @Test
    public void testSend() throws Exception{

        sender.send("Hi!");
        Message message = (Message) this.messageCollector.forChannel(this.processor.output()).poll(1, TimeUnit.SECONDS);
        String messageData = message.getPayload().toString();
        System.out.println(messageData);

    }

}

You should see "Hi!" in the console.