Question

I have a stream of data from the master source, and second stream with enrichment data from a different source. Unfortunately, the enrichment messages often arrive before the original piece of data. I’d like to ensure that the enrichment message is buffered until the original message is first published. Can I achieve this with Rx?

Answer 1

Short answer, probably. As @Enigmativity eluded too, this stands as a somewhat open ended question.

1. Are there 1-to-1 messages (apparently not – ‘There may not be an enrichment value’)
2. Will the enrichment messages and master messages arrive in the same order. If not then I assume there is an Id of some sort to match an enrichment to a master message
3. It seems that the master message may not be delayed and must be pushed through as it arrives. How then are enrichment messages applied to the master message? Do we push a new message which is the Master+Enrichment? I assume you don’t want to mutate state i.e. modify the Master message after it has been forward on.