Can we borrow the design of The Netty Project, say returning a
`org.apache.dubbo.filter.Future` that is declared like below:
```java
class Future<T> {
T get(); // wait for the result synchronously
void onComplete(SomeContext c); // asynchronously
void onSend(SomeContext c); // asynchronously
void onError(SomeContext c); // asynchronously
// ... other callbacks
}
```
then users can do something like this:
```java
Filter filter = ...;
Future f = filter.invoke(...);
// if synchronous call is needed
f.get();
// if asynchronous call is needed
f.onSend(context -> { /* lambda */ });
f.onError(context -> { /* lambda */ });
// ... others
```
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/3585 ]
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