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There will have two parts in this repo
* AsyncSignal class specially designed to distinguish async method.
* A compiler hacker processer that is able to generate async counterpart for each method in you Dubbo service interface.
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## AsyncSignal
AsyncSignal is an optional convenient type provided to unify your service definitions.
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## Compiler hacker processer
It should run at compile time, and overwrite each method in your service definition with an async equivalence.
I think we can try to realize it by referencing [lombok](https://projectlombok.org/).
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+# Conclude
+ The essential part is to overwrite a new async method. Another way would be to generate a new method with a different name, for example, `sayHiAsync`, then we can get rid of `AsyncSignal`. But there's an obvious flaw of this way, that is, all method level configurators and routers defined to `sayHi` will not take effect.
