Comment by goldenkey
5 years ago
Wouldn't an observer pattern work better? The graph itself could even be used to instantiate subscriptions in a pub/sub system where changes in underlying pricing could be dealt with via an event queue. Compaction and debouncing could be applied on top of the queue to avoid lots and lots of redundant execution.
> Wouldn't an observer pattern work better?
Better as a solution to what problem? In some cases a dependency graph is an excellent solution. In some cases it's not. In some cases it's fine for small graphs but scales poorly as it can be very hard to reason about (as attested by pretty much anyone who's supported a really big spreadsheet).
But that's the point; it's a really useful tool. Sometimes.