Feature Request: Have EventEmitter.sendAndReceive return a Promise

[basejump]

Or return a promiseList. We can then use the get or wait to block if we need the results of the event to proceed for certain business logic.

example use need

class CostService implements EventPublisher {
    Long sumWithTax(List<Long> nums) {
        Long result =nums.sum()
        AtomicLong taxTotal = new AtomicLong(0)

        sendAndReceive("calcTaxes", result){ Long tax ->
            taxTotal.addAndGet(tax)
        }.get() //assuming it returns a promisList

        return result + taxTotal.get()
    }
}

Would it be better to add a new method instead of the sendAndReceive? Maybe call it notifyPromise?