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Add Kotlin event processing examples #248
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c93c7b0
Add event processing patterns for Kotlin
gvdongen b57fefc
Add Kotlin event processing examples to the readmes
gvdongen 2a3d67e
Add Kotlin event processing examples to the readmes
gvdongen c819360
Fix kotlin side effect run to runBlock
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| version: '3' | ||
| services: | ||
| broker: | ||
| image: confluentinc/cp-kafka:7.5.0 | ||
| container_name: broker | ||
| ports: | ||
| - "9092:9092" | ||
| - "9101:9101" | ||
| environment: | ||
| KAFKA_BROKER_ID: 1 | ||
| KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: CONTROLLER:PLAINTEXT,PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT | ||
| KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://broker:29092,PLAINTEXT_HOST://localhost:9092 | ||
| KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1 | ||
| KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS: 0 | ||
| KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1 | ||
| KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1 | ||
| KAFKA_PROCESS_ROLES: broker,controller | ||
| KAFKA_NODE_ID: 1 | ||
| KAFKA_CONTROLLER_QUORUM_VOTERS: 1@broker:29093 | ||
| KAFKA_LISTENERS: PLAINTEXT://broker:29092,CONTROLLER://broker:29093,PLAINTEXT_HOST://0.0.0.0:9092 | ||
| KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT | ||
| KAFKA_CONTROLLER_LISTENER_NAMES: CONTROLLER | ||
| KAFKA_LOG_DIRS: /tmp/kraft-combined-logs | ||
| CLUSTER_ID: MkU3OEVBNTcwNTJENDM2Qk | ||
|
|
||
| init-kafka: | ||
| image: confluentinc/cp-kafka:7.5.0 | ||
| depends_on: | ||
| - broker | ||
| entrypoint: [ '/bin/sh', '-c' ] | ||
| command: | | ||
| "# blocks until kafka is reachable | ||
| kafka-topics --bootstrap-server broker:29092 --list | ||
| echo -e 'Creating kafka topics' | ||
| kafka-topics --bootstrap-server broker:29092 --create --if-not-exists --topic social-media-posts --replication-factor 1 --partitions 1 | ||
| kafka-topics --bootstrap-server broker:29092 --create --if-not-exists --topic package-location-updates --replication-factor 1 --partitions 1 | ||
|
|
||
| echo -e 'Successfully created the following topics:' | ||
| kafka-topics --bootstrap-server broker:29092 --list" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| [[ingress.kafka-clusters]] | ||
| name = "my-cluster" | ||
| brokers = ["PLAINTEXT://localhost:9092"] |
49 changes: 49 additions & 0 deletions
49
kotlin/patterns-use-cases/src/main/kotlin/my/example/eventenrichment/PackageTracker.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package my.example.eventenrichment | ||
|
|
||
| import dev.restate.sdk.annotation.Handler | ||
| import dev.restate.sdk.annotation.Shared | ||
| import dev.restate.sdk.annotation.VirtualObject | ||
| import dev.restate.sdk.common.StateKey | ||
| import dev.restate.sdk.common.TerminalException | ||
| import dev.restate.sdk.http.vertx.RestateHttpEndpointBuilder | ||
| import dev.restate.sdk.kotlin.KtSerdes | ||
| import dev.restate.sdk.kotlin.ObjectContext | ||
| import dev.restate.sdk.kotlin.SharedObjectContext | ||
| import kotlinx.serialization.Serializable | ||
|
|
||
| @Serializable | ||
| data class PackageInfo(val finalDestination: String, val locations: MutableList<LocationUpdate> = mutableListOf()) | ||
| @Serializable | ||
| data class LocationUpdate(val timestamp: String, val location: String) | ||
|
|
||
| @VirtualObject | ||
| class PackageTracker { | ||
|
|
||
| companion object { | ||
| private val PACKAGE_INFO = StateKey.of("package-info", KtSerdes.json<PackageInfo>()) | ||
| } | ||
|
|
||
| @Handler | ||
| suspend fun registerPackage(ctx: ObjectContext, packageInfo: PackageInfo) { | ||
| ctx.set(PACKAGE_INFO, packageInfo) | ||
| } | ||
|
|
||
| @Handler | ||
| suspend fun updateLocation(ctx: ObjectContext, locationUpdate: LocationUpdate) { | ||
| val packageInfo = ctx.get(PACKAGE_INFO) | ||
| ?: throw TerminalException("Package not found") | ||
|
|
||
| packageInfo.locations.add(locationUpdate) | ||
| ctx.set(PACKAGE_INFO, packageInfo) | ||
| } | ||
|
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||
| @Shared | ||
| suspend fun getPackageInfo(ctx: SharedObjectContext): PackageInfo { | ||
| return ctx.get(PACKAGE_INFO) | ||
| ?: throw TerminalException("Package not found") | ||
| } | ||
| } | ||
|
|
||
| fun main() { | ||
| RestateHttpEndpointBuilder.builder().bind(PackageTracker()).buildAndListen() | ||
| } | ||
37 changes: 37 additions & 0 deletions
37
kotlin/patterns-use-cases/src/main/kotlin/my/example/eventtransactions/UserFeed.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| package my.example.eventtransactions | ||
|
|
||
| import dev.restate.sdk.annotation.Handler | ||
| import dev.restate.sdk.annotation.VirtualObject | ||
| import dev.restate.sdk.http.vertx.RestateHttpEndpointBuilder | ||
| import dev.restate.sdk.kotlin.ObjectContext | ||
| import dev.restate.sdk.kotlin.runBlock | ||
| import kotlinx.serialization.Serializable | ||
| import my.example.eventtransactions.utils.createPost | ||
| import my.example.eventtransactions.utils.getPostStatus | ||
| import my.example.eventtransactions.utils.updateUserFeed | ||
| import kotlin.time.Duration.Companion.milliseconds | ||
|
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||
| @VirtualObject | ||
| class UserFeed { | ||
|
|
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| @Serializable | ||
| data class SocialMediaPost(val content: String, val metadata: String) | ||
|
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| @Handler | ||
| suspend fun processPost(ctx: ObjectContext, post: SocialMediaPost) { | ||
| val userId = ctx.key() | ||
|
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| val postId = ctx.runBlock { createPost(userId, post) } | ||
|
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| while (ctx.runBlock { getPostStatus(postId) } == "PENDING") { | ||
| ctx.sleep(5000.milliseconds) | ||
| } | ||
|
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| ctx.runBlock { updateUserFeed(userId, postId) } | ||
| } | ||
| } | ||
|
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| fun main() { | ||
| RestateHttpEndpointBuilder.builder().bind(UserFeed()).buildAndListen() | ||
| } | ||
|
|
28 changes: 28 additions & 0 deletions
28
kotlin/patterns-use-cases/src/main/kotlin/my/example/eventtransactions/utils/stubs.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| package my.example.eventtransactions.utils | ||
|
|
||
| import my.example.eventtransactions.UserFeed | ||
| import org.apache.logging.log4j.LogManager | ||
| import org.apache.logging.log4j.Logger | ||
| import java.util.UUID | ||
|
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||
| private val logger: Logger = LogManager.getLogger("UserFeed") | ||
|
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| fun createPost(userId: String, post: UserFeed.SocialMediaPost): String { | ||
| val postId = UUID.randomUUID().toString() | ||
| logger.info("Creating post {} for user {}", postId, userId) | ||
| return postId | ||
| } | ||
|
|
||
| fun getPostStatus(postId: String): String { | ||
| return if (Math.random() < 0.8) { | ||
| logger.info("Content moderation for post {} is still pending... Will check again in 5 seconds", postId) | ||
| "PENDING" | ||
| } else { | ||
| logger.info("Content moderation for post {} is done", postId) | ||
| "DONE" | ||
| } | ||
| } | ||
|
|
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| fun updateUserFeed(userId: String, postId: String) { | ||
| logger.info("Updating user feed for user {} with post {}", userId, postId) | ||
| } |
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It can be just
KtStateKey.json<PackageInfo>("package-info")