{"id":19463751,"url":"https://github.com/adamko-dev/kotka-streams","last_synced_at":"2025-10-26T13:06:29.015Z","repository":{"id":38001495,"uuid":"448272815","full_name":"adamko-dev/kotka-streams","owner":"adamko-dev","description":"Kotka Streams - the Kotlin DSL for Kafka Streams","archived":false,"fork":false,"pushed_at":"2025-07-18T15:48:44.000Z","size":1030,"stargazers_count":16,"open_issues_count":3,"forks_count":0,"subscribers_count":1,"default_branch":"main","last_synced_at":"2025-07-18T19:57:54.011Z","etag":null,"topics":["kafka","kafka-streams","kotlin","kotlin-dsl"],"latest_commit_sha":null,"homepage":"https://adamko-dev.github.io/kotka-streams/","language":"Kotlin","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"apache-2.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/adamko-dev.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null}},"created_at":"2022-01-15T12:36:32.000Z","updated_at":"2025-04-09T10:20:21.000Z","dependencies_parsed_at":"2023-11-18T13:29:06.710Z","dependency_job_id":"a78001c1-cb5e-43bc-94f4-66b0b640f88d","html_url":"https://github.com/adamko-dev/kotka-streams","commit_stats":null,"previous_names":[],"tags_count":20,"template":false,"template_full_name":null,"purl":"pkg:github/adamko-dev/kotka-streams","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/adamko-dev%2Fkotka-streams","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/adamko-dev%2Fkotka-streams/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/adamko-dev%2Fkotka-streams/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/adamko-dev%2Fkotka-streams/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/adamko-dev","download_url":"https://codeload.github.com/adamko-dev/kotka-streams/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/adamko-dev%2Fkotka-streams/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":281107381,"owners_count":26444851,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","status":"online","status_checked_at":"2025-10-26T02:00:06.575Z","response_time":61,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["kafka","kafka-streams","kotlin","kotlin-dsl"],"created_at":"2024-11-10T18:12:02.827Z","updated_at":"2025-10-26T13:06:28.997Z","avatar_url":"https://github.com/adamko-dev.png","language":"Kotlin","funding_links":[],"categories":[],"sub_categories":[],"readme":"[![GitHub license](https://img.shields.io/github/license/adamko-dev/kotka-streams?style=flat-square)](https://github.com/adamko-dev/kotka-streams/blob/main/LICENSE)\n[![](https://jitpack.io/v/adamko-dev/kotka-streams.svg?style=flat-square)](https://jitpack.io/#adamko-dev/kotka-streams)\n[![Maven Central](https://img.shields.io/maven-central/v/dev.adamko.kotka/kotka-streams?color=%234c1\u0026style=flat-square)](https://search.maven.org/search?q=g:dev.adamko.kotka)\n[![Maven Central Snapshots](https://img.shields.io/maven-metadata/v?label=snapshots\u0026metadataUrl=https%3A%2F%2Fs01.oss.sonatype.org%2Fcontent%2Frepositories%2Fsnapshots%2Fdev%2Fadamko%2Fkotka%2Fkotka-streams%2Fmaven-metadata.xml\u0026style=flat-square\u0026color=%234ff)](https://s01.oss.sonatype.org/content/repositories/snapshots/dev/adamko/kotka/)\n\n# Kotka Streams - Kotlin for Kafka Streams\n\nUsing [Kotka](https://github.com/adamko-dev/kotka-streams) means a more pleasant experience while\nusing [Kafka Streams](https://kafka.apache.org/documentation/streams/).\n\n\n## Quickstart\n\nAdd a dependency on `kotka-streams-extensions` for the basics.\n\n```kotlin\n// build.gradle.kts\nrepositories {\n  mavenCentral()\n}\n\ndependencies {\n  implementation(\"dev.adamko.kotka:kotka-streams-extensions:$kotkaVersion\")\n}\n```\n\n## Modules\n\nThere are three modules. Add a dependency on `com.github.adamko-dev:kotka-streams` to get them all\nat once\n\n```kotlin\ndependencies {\n  implementation(\"dev.adamko.kotka:kotka-streams:$kotkaVersion\")\n}\n```\n\n### `kotka-streams-extensions`\n\nContains the basic extension functions to make Kafka Streams more Kotlin-esque.\n\n```kotlin\n  implementation(\"dev.adamko.kotka:kotka-streams-extensions:$kotkaVersion\")\n```\n\n```kotlin\nimport dev.adamko.kotka.extensions.tables.*\nimport dev.adamko.kotka.extensions.streams.*\nimport dev.adamko.kotka.extensions.*\n\ndata class MusicalBand(\n  val name: String,\n  val memberNames: List\u003cString\u003e,\n)\n\nbuilder.stream\u003cString, MusicalBand\u003e(\"musical-bands\")\n  .flatMap(\"band-member-names-to-band-name\") { _: String, band: MusicalBand -\u003e\n    band.memberNames.map { memberName -\u003e memberName to band.name }\n  }\n  .groupByKey(groupedAs(\"map-of-band-member-to-band-names\"))\n```\n\n### `kotka-streams-framework`\n\nA light framework for structuring topics and records.\n\n```kotlin\n  implementation(\"dev.adamko.kotka:kotka-streams-framework:$kotkaVersion\")\n```\n\nUse `TopicRecord` to standardise the data on each topic. Records can now easily be converted from\none type, to another.\n\n```kotlin\nimport dev.adamko.kotka.extensions.tables.*\nimport dev.adamko.kotka.extensions.streams.*\nimport dev.adamko.kotka.extensions.*\nimport dev.adamko.kotka.topicdata.*\n\ndata class Animal(\n  val id: Long,\n  val name: String,\n) : TopicRecord\u003cLong\u003e {\n  override val topicKey: Long by ::id\n}\n\ndata class Pet(\n  val id: Long,\n  val name: String,\n) : TopicRecord\u003cLong\u003e {\n  override val topicKey: Long by ::id\n}\n\nval petUpdates = builder.stream\u003cLong, Animal\u003e(\"animals\")\n  .mapTopicRecords(\"convert-animals-to-pets\") { _, animal -\u003e\n    Pet(animal.id, animal.name)\n  }\n```\n\nUse `KeyValueSerdes\u003cK, V\u003e` to define both the key and value serdes for a topic.\nA `TopicDefinition\u003cK, V\u003e` ties both of these together.\n\n```kotlin\n/** All [Pet] updates */\nobject PetUpdatesTopic : TopicDefinition\u003cLong, Animal\u003e {\n  override val topicName = \"pet-updates\"\n  override val serdes = KeyValueSerdes(Serdes.Long(), PetSerde())\n}\n\npetUpdates\n  .to(\n    PetUpdatesTopic.topicName,\n    PetUpdatesTopic.serdes.producer(\"send-pet-updates-to-pet-update-topic\")\n  )\n```\n\n### `kotka-streams-kotlinx-serialization`\n\nUse [Kotlinx Serialization](https://github.com/Kotlin/kotlinx.serialization/) for topic key/value\nserdes.\n\n```kotlin\nimplementation(\"dev.adamko.kotka:kotka-streams-kotlinx-serialization:$kotkaVersion\")\n```\n\n```kotlin\nimport dev.adamko.kotka.extensions.tables.*\nimport dev.adamko.kotka.extensions.streams.*\nimport dev.adamko.kotka.extensions.*\nimport dev.adamko.kotka.topicdata.*\nimport dev.adamko.kotka.kxs.*\n\nval jsonMapper = Json {}\n\n@Serializable\ndata class Sku(\n  val sku: String\n)\n\n@Serializable\ndata class ShopItem(\n  val id: Sku,\n  val name: String,\n) : TopicRecord\u003cSku\u003e {\n  override val topicKey: Sku by ::id\n}\n\nobject ShopItemTopic : TopicDefinition\u003cLong, ShopItem\u003e {\n  override val topicName = \"shop-item-updates\"\n  override val serdes = KeyValueSerdes.kxsJson(jsonMapper)\n}\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fadamko-dev%2Fkotka-streams","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fadamko-dev%2Fkotka-streams","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fadamko-dev%2Fkotka-streams/lists"}