I am hoping that I can receive some pointers on how I would implement a
cache within a flow. An example goal would be to be given a list of URLs
and to provide statistics on the content of each of those URLs. However
due to bandwidth constraints, I only want to refresh from the last set of
known URLs every 30 minutes. So use the value from the cache if it is less
than 30 minutes old otherwise to refresh from the website.
val f = Source.single("http://example.com";)
.via(fetchContentFromWebsite)
.runFold(BigDecimal("0"))((totalSalaries, contentOption) => contentOption.
fold(totalSalaries)(content => totalSalaries + content.salary))
I know I could just implement a cache within the "fetchContentFromWebsite"
flow (within its map function) but that doesn't seem right to me. I have
looked into FlexiMerge but it appears to hit both inputs regardless. I
guess I am looking for a way to implement a conditional flow: use value
from cache otherwise use value from website.
Thanks,
Seamus
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