Vertx | 为什么代理服务或事件总线服务不适用于Future？

Question

Why is that the development of proxy service or event bus service works only with Async Handler and not with Future. If I pass Future to one of the methods of a Service Interface/Implementation and if I do a future.completer , it eventually returns Handler<AsyncResult<T>> and so does the service methods requires as a parameter (Handler<AsyncResult<T>>) .

This is the error I get while building my application:

Could not generate model for addAccount(Account,io.vertx.core.Future): type io.vertx.core.Future is not legal for use for a parameter in proxy io.vertx.codegen.GenException: type io.vertx.core.Future is not legal for use for a parameter in proxy

Answer 1

There are restrictions on the types you can use when you define your service proxy interface. They are listed in the Restrictions for service interface of the documentation. In particular:

If an asynchronous result is required a last parameter of type Handler<AsyncResult<R>> can be provided.