September 2018
Intermediate to advanced
398 pages
9h 43m
English
Content preview from Scala Programming Projects
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Implementing processOneBatch
Here is the implementation of BatchProducer.processOneBatch. As is often the case, the implementation is much shorter than the test:
val WaitTime: FiniteDuration = 59.minuteval ApiLag: FiniteDuration = 5.secondsdef processOneBatch(fetchNextTransactions: IO[Dataset[Transaction]], transactions: Dataset[Transaction], saveStart: Instant, saveEnd: Instant)(implicit appCtx: AppContext): IO[(Dataset[Transaction], Instant, Instant)] = { import appCtx._ val transactionsToSave = filterTxs(transactions, saveStart, saveEnd) for { _ <- BatchProducer.save(transactionsToSave, appCtx.transactionStorePath) _ <- IO.sleep(WaitTime) beforeRead <- currentInstant end = beforeRead.minusSeconds(ApiLag.toSeconds) nextTransactions <- ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.