Question

我有一种情况，我必须停止主线程，直到执行第二个线程为止。

@Test
@UiThreadTest
public void shouldShowClipboardViewOnCopyText() {
    ...
}

Answer 1

您可以将计算结果包装在CompletableFuture中，然后等待将来完成。我已根据您的代码在下面放置了示例，您可能需要进行一些更改才能使它起作用，但是您将获得大致的想法

@PostMapping("/filter")
public ResponseEntity<?> filter(@Valid @RequestBody R1 r1) throws InterruptedException {

    Double lat = (r1.getLat());
    Double lang = r1.getLongi();

    List<LatLang> list2 =latlangRepo.findAllWithin(lang,lat);   

    List<Future<String>> futures = new ArrayList<>();

    for (i = 0; i < x; i++) {
        Double lat1 = list2.get(i).getLat();
        Double longi1 = list2.get(i).getLang();

        //Delegate to the thread asynchronously 
        Future<String> completableFuture = calculateAsync();
        futures.add(completableFuture);
    }
    //Wait for the completion of all the futures and collact result
    String combined = futures.stream().
        .map(CompletableFuture::join)
        .collect(Collectors.joining(" "));
}

public Future<String> calculateAsync(Double lat, Double long) throws InterruptedException {
    CompletableFuture<String> completableFuture 
      = new CompletableFuture<>();

    Executors.newCachedThreadPool().submit(() -> {
        //Your computation here
        completableFuture.complete("Result of your computation");
    });

    return completableFuture;
}

查看更多示例here

我如何处理Spring Boot主线程以等待新线程进行一些计算

1 个答案: