> @khanimteyaz Thanks for your attention, I will try to explain.
>
> As you may have noticed, we support a service definition with a
> CompletableFuture as the return type.
>
> ```java
> public interface AsyncService {
> CompletableFuture<String> sayHello(String name);
> }
> ```
>
> But this is newly introduced in 2.7.0, which means, there would be many
> legacy services that can not leverage this feature. Because if they change
> the service definition (the interface definition) they will have to
> reimplement their service to meet the new definition.
> For example, here is a typical service definition before 2.7.0
>
> ```java
> public interface GreetingsService {
> String sayHi(String name);
> }
> ```
>
> To be able to call this service asynchronously, they have to use `RpcContext`
> to get the `Future`, like this:
>
> ```java
> // the invoke will return null immediately
> greetingsService.sayHi("world");
> // get the Future instance, the future will get notified once the result
> returns.
> Future<String> future = RpcContext.getContext().getFuture();
> ```
>
> Annotation @AsyncFor is a mechanism I introduced to simplify the process for
> those legacy services, you can refer to
> [here](https://github.com/dubbo/dubbo-async-processor/tree/deprecated-processer)
> for how it works.
>
> But now, as long as I realized we have supported java 8, we can use the
> default method to avoid generating a new class.
> [Here](https://github.com/dubbo/dubbo-async-processor/blob/master/README.md)
> is the new way I have come up with, this is what mean by saying `move the
> @AsyncFor from core to side project '. This way, this would become a
> convenient solution we provide but not a mandatory solution provided in core.
@chickenlj Thanks a lot for the details. Appreciate it.
I will give a look into this PR.
[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/3095 ]
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