kafka4s | Functional programming with Kafka and Scala | Functional Programming library
kandi X-RAY | kafka4s Summary
kandi X-RAY | kafka4s Summary
kafka4s provides pure, referentially transparent functions for working with Kafka, and integrates with FP libraries such as cats-effect and fs2.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of kafka4s
kafka4s Key Features
kafka4s Examples and Code Snippets
libraryDependencies ++= Seq(
"com.banno" %% "kafka4s" % ""
)
Stream
.resource(ProducerApi.resource[F, Int, Int](BootstrapServers(kafkaBootstrapServers)))
.flatMap { producer =>
Stream
.awakeDelay[F](1 second)
.evalMap { _ =&
Community Discussions
Trending Discussions on kafka4s
QUESTION
When I went through the Example code of Kafka4S, I could not understand what exactly do the multiple colons(:) after F[_]
mean. After searching around, re-reading the Scala language spec, I can only guess that this code means that F[_]
has the 3 types (Concurrent, ContextShift, Timer) as mixin?
ANSWER
Answered 2021-Apr-26 at 20:03Close, but no. If you wanted to say, that F
is a subclass of those three things, you would write it as F[_] <: Concurrent with ContextShift with Timer
.
What those colons mean is that F
belongs to those three type classes.
If you are not familiar with the concept of type class, I'd recommend to start with some quick intro. Like here, or here, or here, but in a nutshell what that syntax means is that for every type F
that is valid in that context, there will be instances of Concurrent[F]
, ContextShift[F]
and Timer[F]
implicitly available.
In general, def foo[Bar : Baz : Bat : Bak]()
is a shortcut for
def foo[Bar]()(implicit z: Baz[Bar], t: Bat[Bar], k: Bak[Bar])
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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