[IDEA] Extend the API of Destination set to be able to query it

[ppazos]

Is your feature request related to a problem? Please describe.

I have a use case where I needed to know if the DestinationSet was empty or not but the current API doesn't allow any querying. It only allows to remove destinations. I was also expecting it to be a set but it actually inherits from Object not from Set

Describe your use case
Checking if there is any destination in the DSet.

Describe the solution you'd like
Have a size() or isEmpty() method.

Describe alternatives you've considered
The workaround for what I need to do was creating a custom list for destinations and check against it from a parameter value (the name of the destination), and checking if the DSet was empty would have been quicker because I do a remoceAllExcept() of that parameter, so if the DSet is empty it means the given destination is working I wrong, which is what I needed to do.

Additional context
Creating a router for a http listener, that does destinationSet.removeAllExcept([xxx]); and I need to check if xxx is actually a valid destination or not, meaning the destinationSet would be empty.

REFs:

nextgenhealthcare#4414
OpenIntegrationEngine/engine#44

[dsvanstedt]

Thanks for the feedback, we will try to target this for our next release at the end of Q1.