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Purely functional Scala wrapper over the official Pulsar client.
- Type-safe (utilizes Scala type system to reduce runtime exceptions present in the official Java client)
- Streaming-enabled (naturally integrates with ZIO Streams)
- ZIO integrated (uses common ZIO primitives like ZIO effect and ZManaged to reduce the boilerplate and increase expressiveness)
ZIO Pulsar is a Scala 3 library, so it's compatible with Scala 3 applications as well as Scala 2.13.6+ (see forward compatibility for more information.
Add the following dependency to your build.sbt file:
Scala 3
libraryDependencies += "com.github.jczuchnowski" %% "zio-pulsar" % zioPulsarVersion
Scala 2.13.6+ (sbt 1.5.x)
libraryDependencies +=
("com.github.jczuchnowski" %% "zio-pulsar" % zioPulsarVersion).cross(CrossVersion.for2_13Use3)
ZIO Pulsar also needs ZIO and ZIO Streams to be provided:
libraryDependencies ++= Seq(
"dev.zio" %% "zio" % zioVersion,
"dev.zio" %% "zio-streams" % zioVersion
)
Simple example of consumer and producer:
import org.apache.pulsar.client.api.{ PulsarClientException, Schema }
import zio._
import zio.pulsar._
object Main extends App:
val pulsarClient = PulsarClient.live("localhost", 6650)
val topic = "my-topic"
val app: ZManaged[PulsarClient, PulsarClientException, Unit] =
for
builder <- ConsumerBuilder.make(Schema.STRING).toManaged_
consumer <- builder
.topic(topic)
.subscription(
Subscription(
"my-subscription",
SubscriptionType.Shared))
.build
producer <- Producer.make(topic, Schema.STRING)
_ <- producer.send("Hello!").toManaged_
m <- consumer.receive.toManaged_
yield ()
def run(args: List[String]): URIO[ZEnv, ExitCode] =
app.provideCustomLayer(pulsarClient).useNow.exitCodeTo try the examples from the examples subproject you'll need a Pulsar instance running locally. You can set one up using docker:
docker run -it \
-p 6650:6650 \
-p 8080:8080 \
--mount source=pulsardata,target=/pulsar/data \
--mount source=pulsarconf,target=/pulsar/conf \
--network pulsar \
apachepulsar/pulsar:2.7.0 \
bin/pulsar standalone
