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    scala-steward commented #519
Miguel Vilá
@miguel-vila
you can see the differences between the working version and the non working version there
so I'm wondering if this is something that's expected? were we missusing scalacache?
Roberto Leibman
@rleibman
@miguel-vila I didn't know there was even an official zio mode. I put a PR back in April but haven't heard anything since.
sc6l6d3v
@sc6l6d3v
Is there any possibility of caching an fs2 stream?
Simon Redfern
@simonredfern_gitlab
Folks, Nubeee here. How do I make the following work with maven?: import scalacache.serialization.binary._
PawelJ-PL
@PawelJ-PL
Hi, I'm wonder why traits Cache and CacheAlg doesn't include effect type parameter (it was moved to methods declarations). I've just created an issue for this (cb372/scalacache#417), where I've explained my doubts more precisely.
SWAPNIL SONAWANE
@iamswapnil44_twitter
Folks, Is there any way to retrive all the keys from Caffeine cache ?
Brendan Maguire
@brendanmaguire

Hi. Hoping someone can help with a question I have regarding using scalacache with cats.effect.IO. If I run the following code:

import cats.effect.{ExitCode, IO, IOApp}
import cats.implicits._
import scalacache.guava.GuavaCache
import scalacache.{cachingF, CacheConfig, Flags}

import scala.concurrent.duration.DurationLong

object CacheTest extends IOApp {

  override def run(args: List[String]): IO[ExitCode] =
    (
      cached("abc"),
      cached("abc"),
      cached("def")
    ).parMapN(_ + _ + _) *> IO.pure(ExitCode.Success)

  private val cache = GuavaCache[String](CacheConfig.defaultCacheConfig)

  private def cached(key: String) =
    cachingF(key)(ttl = None)(loadValue(key))(cache, scalacache.CatsEffect.modes.async, Flags.defaultFlags)

  private def loadValue(key: String) =
    IO(println(s"Loading $key")) *>
      IO.sleep(1.second) *>
      IO {
        println(s"Loaded $key")
        key
      }
}

I get the output:

Loading abc
Loading abc
Loading def
Loaded abc
Loaded abc
Loaded def

cachingF invokes the loadValue function twice with "abc". Instead I would like it to only invoke it once and use the resulting IO for both calls to cached. Is this possible using scalacache or do I need to implement this manually by storing an actual IO in the cache and removing the key if the IO fails at a later stage?

SWAPNIL SONAWANE
@iamswapnil44_twitter

Hello All,

Is there any way to get the redis cache stats like hit rate , hit count as we get it for caffaine by using caffainecache.stats.hitCount()

SWAPNIL SONAWANE
@iamswapnil44_twitter

Hello All ,

Is there any way to provide custom codecs for redis cache.

here is my code :

def creatCache[T](implicit  codec: Codec[T]) = {
      val jedisPool = new JedisPool(new JedisPoolConfig(), "localhost", 6379, 20000)
      val customisedRedisCache: Cache[T] = RedisCache[T](jedisPool)
      customisedRedisCache
}

and calling this function as

 implicit val jobPropsCache = creatCache[Map[String,String]]

code is failing at calling thr function. error is

 No implicits provides for codec: Codec[Map[String,String]]
Yoann Guyot
@ygu

Hi there, I'm migrating from scala 2.12 to 2.13, including code that was written using scalacache and guava. But now the compiler refuses that code. These are the issues:

import scalacache._
import scalacache.serialization.InMemoryRepr
import guava._

class MyClass(cache: ScalaCache[InMemoryRepr]) {...}

gives me : object InMemoryRepr is not a member of package scalacache.serialization and: not found: type ScalaCache

Also:
sync.cachingWithTTL(key)(Duration.apply(1, DAYS)) { ... }

gives me: value cachingWithTTL is not a member of object scalacache.sync

Finally:
ScalaCache(GuavaCache())

gives me:

overloaded method apply with alternatives:
[error]   [V](underlying: com.google.common.cache.Cache[String,scalacache.Entry[V]])(implicit config: scalacache.CacheConfig): scalacache.guava.GuavaCache[V] <and>
[error]   [V](implicit config: scalacache.CacheConfig): scalacache.guava.GuavaCache[V]
[error]  cannot be applied to ()

Anyone to help migrating to last version of scalacache (I can't find any scaladoc or changelog to help replacing the old code) ?
So, what should I use instead of scalacache.serialization.InMemoryRepr which seems to have been removed from the library.
Why is ScalaCache not found ?
What should I use instead of sync.cachingWithTTL ?
How to use the new constructors of GuavaCache to get the same as old GuavaCache() ? Isn't there a default one ?

@cosmir17 it seems you've experienced the same kind of issue, have you found out how to fix it ?
Yoann Guyot
@ygu

I may have found answers:

  • I use GuavaCache[MyClass] instead of ScalaCache[InMemoryRepr]
  • I use sync.caching(key)(Some(Duration.apply(1, DAYS))) { ... }(cache = myImplicitCache, mode = mode, flags = new Flags()) instead of sync.cachingWithTTL(key)(Duration.apply(1, DAYS)) { ... }
  • I use GuavaCache(config) with implicit val config = CacheConfig() instead of ScalaCache(GuavaCache())

I hope this is correct.

Roberto Leibman
@rleibman
Are there any facilities for multi-level layering of cache systems in either scalacache or in any of the cache systems that scalacache uses? Basically I'd like a short TTL for in memory cache and a a longer TTL for a cloud level cache before I hit the actual process that gets the data.
Roberto Leibman
@rleibman
It may not be too difficult to create a CompoundCache that extends AbstractCache and has a list of caches to try
Jeff Lewis
@lewisjkl
Hey @rleibman I don’t believe that there is a current “out-of-the-box” way to do this. But I agree that you could pretty easily create a compound cache of some kind that did this. We have an issue open to take a look at the API Scalacache exposes before we go live with a final 1.0.0 release and will keep this in mind while going through that exercise.
Roberto Leibman
@rleibman
Cool!
Jeff Lewis
@lewisjkl
My initial instinct is to wait until after the 1.0.0 release is through to look at introducing this functionality, but very happy to hear your thoughts on that. Feel free to open an issue on GH for this if you feel so inclined :)
Roberto Leibman
@rleibman
I think the only weirdness with it would be that each cache would have it's own ttl vs the ttl of the compound cache.
Jeff Lewis
@lewisjkl
Yeah that is a good callout, thanks for putting the issue in!
Vimit Dhawan
@vimitdhawan
Hello Everyone, I am using CaffeineCache in my application but it looks like we can use only string as a key. is there any way to use case class
Brian P. Holt
@bpholt

When using ScalaCache with cats-effect and Caffeine, is it a good idea to set the Caffeine executor field to the cats-effect Blocker being used?

e.g.

Caffeine.newBuilder().maximumSize(10000L).executor(blocker.blockingContext.execute(_)).build[String, Entry[String]]
Leo De Souza
@cleliofs
Hi all, I am new to Scalacache lib. I am looking for a good introduction to it using Caffeine underlining cache. Any suggestion for an introductory post? I checked the documentation (https://cb372.github.io/scalacache/docs/) but it is quite poor tbh :( For example, which Sbt libs I need to include to support the diff Modes as per "scalacache.modes.try."?
Ashwin Bhaskar
@ashwinbhaskar
is there an integration of scalacache with ZIO?
if not, any pointers on how I should go about building a Mode for ZIO effects ?