从另一个APIendpoint动态触发现有流量--Spring Webflux

Question

@SpringBootApplication
@RestController
public class DemoApplication {

    final FluxProcessor processor;
    final FluxSink sink;
    final AtomicLong counter;

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);

    }

    public DemoApplication() {
        this.processor = DirectProcessor.create().serialize();
        this.sink = processor.sink();
        this.counter = new AtomicLong();
    }

    @GetMapping("/send/{userId}")
    public void test(@PathVariable("userId") String userId) {
        sink.next("Hello World #" + counter.getAndIncrement());
    }

    @RequestMapping(produces = MediaType.TEXT_EVENT_STREAM_VALUE)
    public Flux<ServerSentEvent> sse() {
        return processor.map(e -> ServerSentEvent.builder(e).build());
    }
}

Answer 1

这不是一个准确或实际的解决方案，但这是可行的：首先，SSEendpoint：

@RestController
public class SSEController {
    private String value = "";
    public String getValue() {
        return value;
    }
    public void setValue(String value) {
        this.value = value;
    }
    @GetMapping(path = "/sse", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
    Flux<String> getWords() {
        System.out.println("sse ?");
        return Flux.interval(Duration.ofSeconds(1))
                .map(sequence -> getValue());
    }
}

从任何服务或任何你能做到的地方，只需做到：

@Service
public class SomeService {
    @Autowired
    private SSEController sseController;
    ...
    void something(){
        ....
        sseController.setValue("some value");
        ....
    }

我就是这么用的。