VertX 多个 Future 返回一个 Future

Question

我正在尝试调用 3 个 future，等待它们完成，处理结果，然后将所有这些也作为 Future 返回。我似乎无法弄清楚如何将 3 个期货“包装”在未来中以使其返回，这样它就不会立即返回。我是 vertx 新手。

public Future<MyObject> getProjectStatus(int projectId) {

      Future future = Future.future(ar -> {
        MyObject object = new Myobject();

        Future<x> f1 = callf1();
        Future<y> f2 = callf2();
        Future<z> f3 = callf3();

        CompositeFuture cf = CompositeFuture.all(f1, f2, f3);
        cf.onComplete(ar2 -> {
          //Check Succeeds
          if(ar2.succeeded()){
            System.out.println("Completed!");
            //DO FURTHER PROCESSING
          } else {
            System.out.println("Failure " + ar2.cause().getMessage());
          }
        }).map((object));

      });

      return future;

    }

Answer 1

public Future<MyObject> getProjectStatus(int projectId) {

        MyObject object = new Myobject();

        Future<x> f1 = callf1();
        Future<y> f2 = callf2();
        Future<z> f3 = callf3();

        return CompositeFuture.all(f1, f2, f3).onComplete(ar2 -> {
          //Check Succeeds
          if(ar2.succeeded()){
            System.out.println("Completed!");
            //DO FURTHER PROCESSING
          } else {
            System.out.println("Failure " + ar2.cause().getMessage());
          }
        }).map(object);

    }

或者

public Future<MyObject> getProjectStatus(int projectId) {

      Future future = Future.future(ar -> {
        MyObject object = new Myobject();

        Future<x> f1 = callf1();
        Future<y> f2 = callf2();
        Future<z> f3 = callf3();

        CompositeFuture cf = CompositeFuture.all(f1, f2, f3);
        cf.onComplete(ar2 -> {
          //Check Succeeds
          if(ar2.succeeded()){
            System.out.println("Completed!");
            //DO FURTHER PROCESSING
          } else {
            System.out.println("Failure " + ar2.cause().getMessage());
          }
          ar.complete(object);
        });

      });

      return future;

    }