Refactoring classes in Camel 3.0.0 - where to find classes for a custom aggregation strategy

[Gerald Kallas]

Dear community,

I'm going to write a custom aggregation strategy with Camel 3.0.0 with imports 
like

import org.apache.camel.Exchange;
import org.apache.camel.processor.aggregate.AggregationStrategy;
(worked for 2.15)

As Camel 3.0.0 has been refactored, in which package can I find these 2 classes?

Best
- Gerald