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Improve example app #1279

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Jul 14, 2024
Merged

Improve example app #1279

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52 changes: 27 additions & 25 deletions zio-kafka-example/src/main/scala/zio/kafka/example/Main.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -41,32 +41,34 @@ object Main extends ZIOAppDefault {

private val topic = "test-topic"

private def consumerLayer(kafka: MyKafka): ZLayer[Any, Throwable, Consumer] = {
val consumerSettings =
ConsumerSettings(kafka.bootstrapServers)
.withPollTimeout(500.millis)
.withGroupId("test")

ZLayer.make[Consumer](
ZLayer.succeed(consumerSettings),
ZLayer.succeed(Diagnostics.NoOp),
Consumer.live
)
private def consumerSettings: ZLayer[MyKafka, Throwable, ConsumerSettings] = ZLayer {
for {
kafka <- ZIO.service[MyKafka]
} yield ConsumerSettings(kafka.bootstrapServers)
.withPollTimeout(500.millis)
.withGroupId("test")
}

override def run: ZIO[ZIOAppArgs with Scope, Any, Any] =
ZIO.addFinalizer(ZIO.logInfo("Stopping app")) *>
(
for {
_ <- ZIO.logInfo(s"Starting app")
kafka <- ZIO.service[MyKafka]
stream = Consumer
.plainStream(Subscription.topics(topic), Serde.string, Serde.string)
.provideLayer(consumerLayer(kafka))
_ <- ZIO.logInfo(s"Consuming messages...")
consumed <- stream.take(1000).tap(r => ZIO.logInfo(s"Consumed record $r")).runCount
_ <- ZIO.logInfo(s"Consumed $consumed records")
} yield ()
).provideSomeLayer[ZIOAppArgs with Scope](MyKafka.embedded)
private val runConsumerStream: ZIO[Consumer, Throwable, Unit] =
for {
_ <- ZIO.logInfo("Consuming messages...")
consumed <- Consumer
.plainStream(Subscription.topics(topic), Serde.string, Serde.string)
.take(1000)
.tap(r => ZIO.logInfo(s"Consumed record $r"))
.runCount
_ <- ZIO.logInfo(s"Consumed $consumed records")
} yield ()

override def run: ZIO[Scope, Any, Any] =
ZIO.logInfo("Starting app") *>
ZIO.addFinalizer(ZIO.logInfo("Stopping app")) *>
runConsumerStream
.provide(
consumerSettings,
ZLayer.succeed(Diagnostics.NoOp),
Consumer.live,
MyKafka.embedded
)

}
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