Add support for caching

[trezy]

We need to noodle on this one. What it would look like to add caching to HappyView?

Use cases

Cache an XRPC

I have a complex XRPC script. Instead of running it every time it's called, I'd prefer it regenerate every 5 minutes, and always respond with the most recent cached result.

Regenerate cache onn-demand

I want to be able to trigger a cache update from a script. Since I know this type of record will impact the results of the cache, I want to call a method that will force the cache to regenerate.

Open questions

• How do we store caches?
  • Are they just JSON strings?
  • Do they live in the database? On disk?

Solution

• happyview.updateCache(CACHE_NAME) (maybe NSID instead of CACHE_NAME?)