如何在vertx的阻塞代码中返回数据

Question

for example:

public Future<String> test() {
    Future<String> future = Future.succeededFuture();

    return vertx.createSharedWorkerExecutor("test")
        .executeBlocking(y -> {
            return future.map("Something");
        })
        .compose(x -> {
            return future;
        });
}

I want to return String in Blocking code,but it always return null.

Answer 1

You don't need to define Future externally, as you do now.

In your code, y is already a Promise (next version of Future )

Your code could be simplified to:

public Future<String> test() {
    return vertx.createSharedWorkerExecutor("test")
        .executeBlocking(future -> {
            return future.complete("Something");
        });
}