Fwd: Unit Test modify SourceFunction() Instance? Is this possible?

[chrisgopherrong]

Follow-up:

In short, is it possible to add a source to Stream Execution Environment,
execute the stream once, and then reuse the stream multiple times for
different test cases? Simpler example/idea below:

stream.addSource(obj);
stream.addSink(sink);
stream.execute()

when: obj.updateData("123")
test: sink.data == "123"

when: obj.updateData("345")
test: sink.data == "345"

-
When I update the obj, I want the stream to update too without having to
call execute() again.

Is this a possibility (and what would be the steps to achieve this)?

Thanks,
Chris
---------- Forwarded message ---------
From: chrisgopherrong <sirhc8...@gmail.com>
Date: Mon, Dec 14, 2020 at 2:01 PM
Subject: Unit Test modify SourceFunction() Instance? Is this possible?
To: <dev@flink.apache.org>


Hi Flink dev team,

I have a requirement where I need to add a source (Source Function
instance) to a StreamExecutionEnvironment instance, and unit test by
reusing the source instance and just changing its values.

The stream flow:
class1{
   List<Integer> list = new List(1,2,3)
   static MarketObj marketObj = new MarketObj(list);

   setup:
   an instance of class2 will take the marketObj

   test1: assert calculations are correct

   test2: list = new List(4,5,6);
             marketObj.updateList(list);
             assert calculations are correct
}

class2 (MarketObj marketObj) {
   StreamExecutionEnvironment env = new Stream...
   env.addSource(marketObj);
   ...
   env.execute()
}

MarketObject would be a class that extends SourceFunction and should have a
List instance accessible and modifiable by the unit test class (i.e. class
1, each new assert that changes the MarketObject instance).
-
Would this be possible? I have tried both SourceFunction and
RichFlatMapFunction but didn't have success with either.

If this can be done, can you show me an example?

Thanks,
Chris