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feat: Kotlin SDK #213

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42f17c2
Kotlin SDK
BulkBeing Mar 18, 2026
ef838ff
feat: Kotlin SDK
BulkBeing Mar 18, 2026
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56 changes: 56 additions & 0 deletions .github/workflows/kotlin-publish.yml
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# Publishes the Kotlin SDK to Maven Central and GitHub Packages.
# Triggered by GitHub releases with tags matching kotlin-v* (e.g. kotlin-v0.1.0).

name: Publish Kotlin SDK to Maven Central and Github Packages
on:
release:
types: [ created ]
jobs:
publish:
if: startsWith(github.event.release.tag_name, 'kotlin-v')
runs-on: ubuntu-latest
permissions:
contents: read
packages: write

steps:
- uses: actions/checkout@v3
- name: Import GPG key
id: import_gpg
uses: crazy-max/ghaction-import-gpg@v5
with:
gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
passphrase: ${{ secrets.GPG_PASSPHRASE }}

# Build the Java SDK first so it's available as a local dependency
- name: Set up Java
uses: actions/setup-java@v3
with:
java-version: '11'
distribution: 'temurin'
server-id: central
server-username: MAVEN_USERNAME
server-password: MAVEN_PASSWORD
settings-path: ${{ github.workspace }}

- name: Install Java SDK to local repository
run: mvn clean install -DskipTests -q

- name: Publish Kotlin SDK to Maven Central
run: cd numaflow-kotlin && mvn -DcentralRelease=true -P central deploy -s $GITHUB_WORKSPACE/settings.xml
env:
MAVEN_USERNAME: ${{ secrets.MVN_CENTRAL_USERNAME }}
MAVEN_PASSWORD: ${{ secrets.MVN_CENTRAL_PASSWORD }}

- name: Set up Java for publishing to GitHub Packages
uses: actions/setup-java@v3
with:
java-version: '11'
distribution: 'temurin'
server-id: github
settings-path: ${{ github.workspace }}

- name: Publish Kotlin SDK to GitHub Packages
run: cd numaflow-kotlin && mvn -DgithubRelease=true -P github deploy -s $GITHUB_WORKSPACE/settings.xml
env:
GITHUB_TOKEN: ${{ github.token }}
11 changes: 7 additions & 4 deletions .github/workflows/maven-publish.yml
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# This workflow will build a package using Maven and then publish it to Maven Central and GitHub packages when a release is created
# Triggered by tags matching v* (e.g. v0.11.0). Kotlin SDK uses a separate workflow.

name: Publish to Maven Central and Github Packages
name: Publish Java SDK to Maven Central and Github Packages
on:
release:
types: [ created ]
jobs:
publish:
if: startsWith(github.event.release.tag_name, 'v') && !startsWith(github.event.release.tag_name, 'v-kotlin')
runs-on: ubuntu-latest
permissions:
contents: read
Expand All @@ -28,7 +30,7 @@ jobs:
server-id: central
server-username: MAVEN_USERNAME
server-password: MAVEN_PASSWORD
settings-path: ${{ github.workspace }} # location for the settings.xml file
settings-path: ${{ github.workspace }}

- name: Publish to the Maven Central Repository
run: mvn -DcentralRelease=true -P central deploy -s $GITHUB_WORKSPACE/settings.xml
Expand All @@ -41,8 +43,9 @@ jobs:
with:
java-version: '11'
distribution: 'temurin'
server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
settings-path: ${{ github.workspace }} #location for the settings.xml file
server-id: github
settings-path: ${{ github.workspace }}

- name: Publish to GitHub Packages
run: mvn -DgithubRelease=true -P github deploy -s $GITHUB_WORKSPACE/settings.xml
env:
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2 changes: 2 additions & 0 deletions .gitignore
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# Compiled class file
*.class

numaflow-kotlin/target/

# Log file
*.log

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242 changes: 242 additions & 0 deletions numaflow-kotlin/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>io.numaproj.numaflow</groupId>
<artifactId>numaflow-kotlin</artifactId>
<version>0.1.0</version>
<packaging>jar</packaging>

<name>numaflow-kotlin</name>
<description>Kotlin wrapper for Numaflow Java SDK — coroutines, Flow, sealed classes, DSL builders.</description>
<url>https://numaflow.numaproj.io/</url>

<licenses>
<license>
<name>The Apache License, Version 2.0</name>
<url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
</license>
</licenses>

<developers>
<developer>
<name>Numaproj Authors</name>
<email>numaproj@gmail.com</email>
<organization>Numaproj</organization>
<organizationUrl>https://numaproj.io/</organizationUrl>
</developer>
</developers>

<scm>
<connection>scm:git:git://github.com/numaproj/numaflow-java.git</connection>
<developerConnection>scm:git:ssh://github.com:numaproj/numaflow-java.git</developerConnection>
<url>http://github.com/numaproj/numaflow-java/tree/main</url>
</scm>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<kotlin.version>2.1.0</kotlin.version>
<kotlinx.coroutines.version>1.9.0</kotlinx.coroutines.version>
<junit.jupiter.version>5.10.2</junit.jupiter.version>
</properties>

<profiles>
<profile>
<id>github</id>
<activation>
<property>
<name>githubRelease</name>
<value>true</value>
</property>
</activation>
<distributionManagement>
<repository>
<id>github</id>
<name>Numaflow Kotlin SDK</name>
<url>https://maven.pkg.github.com/numaproj/numaflow-java</url>
</repository>
</distributionManagement>
</profile>
<profile>
<id>central</id>
<activation>
<property>
<name>centralRelease</name>
<value>true</value>
</property>
</activation>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-gpg-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<id>sign-artifacts</id>
<phase>verify</phase>
<goals>
<goal>sign</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.sonatype.central</groupId>
<artifactId>central-publishing-maven-plugin</artifactId>
<version>0.8.0</version>
<extensions>true</extensions>
<configuration>
<publishingServerId>central</publishingServerId>
<autoPublish>true</autoPublish>
<waitUntil>published</waitUntil>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>

<dependencies>
<!-- Numaflow Java SDK -->
<dependency>
<groupId>io.numaproj.numaflow</groupId>
<artifactId>numaflow-java</artifactId>
<version>0.11.0</version>
</dependency>

<!-- Kotlin -->
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlinx</groupId>
<artifactId>kotlinx-coroutines-core</artifactId>
<version>${kotlinx.coroutines.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlinx</groupId>
<artifactId>kotlinx-coroutines-jdk8</artifactId>
<version>${kotlinx.coroutines.version}</version>
</dependency>

<!-- Test -->
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test</artifactId>
<version>${kotlin.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlinx</groupId>
<artifactId>kotlinx-coroutines-test</artifactId>
<version>${kotlinx.coroutines.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>${junit.jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<sourceDirectory>src/main/kotlin</sourceDirectory>
<testSourceDirectory>src/test/kotlin</testSourceDirectory>

<plugins>
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<version>${kotlin.version}</version>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>test-compile</id>
<phase>test-compile</phase>
<goals>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
<configuration>
<jvmTarget>11</jvmTarget>
</configuration>
</plugin>

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.2.5</version>
</plugin>

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>3.3.0</version>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar-no-fork</goal>
</goals>
</execution>
</executions>
</plugin>

<plugin>
<groupId>org.jetbrains.dokka</groupId>
<artifactId>dokka-maven-plugin</artifactId>
<version>1.9.20</version>
<executions>
<execution>
<phase>prepare-package</phase>
<goals>
<goal>dokka</goal>
<goal>javadocJar</goal>
</goals>
</execution>
</executions>
</plugin>

<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.12</version>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>report</id>
<phase>prepare-package</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>

<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.12.1</version>
<configuration>
<release>11</release>
</configuration>
</plugin>
</plugins>
</build>
</project>
38 changes: 38 additions & 0 deletions numaflow-kotlin/src/main/kotlin/io/numaproj/numaflow/kt/sinker/Conversions.kt
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package io.numaproj.numaflow.kt.sinker

import io.numaproj.numaflow.shared.UserMetadata
import io.numaproj.numaflow.sinker.Message as JavaMessage
import io.numaproj.numaflow.sinker.Response as JavaResponse

internal fun SinkResponse.toJava(): JavaResponse = when (this) {
is SinkResponse.Ok -> JavaResponse.responseOK(id)
is SinkResponse.Failure -> JavaResponse.responseFailure(id, error)
is SinkResponse.Fallback -> JavaResponse.responseFallback(id)
is SinkResponse.Serve -> JavaResponse.responseServe(id, data)
is SinkResponse.OnSuccess -> JavaResponse.responseOnSuccess(id, message?.toJava())
}

internal fun SinkMessage.toJava(): JavaMessage = JavaMessage(
value,
keys.toTypedArray(),
userMetadata ?: UserMetadata(),
)

internal fun JavaResponse.toKotlin(): SinkResponse {
return when {
success == true -> SinkResponse.Ok(id)
fallback == true -> SinkResponse.Fallback(id)
serve == true -> SinkResponse.Serve(id, serveResponse ?: byteArrayOf())
onSuccess == true -> SinkResponse.OnSuccess(
id,
onSuccessMessage?.let { msg ->
SinkMessage(
value = msg.value ?: byteArrayOf(),
keys = msg.keys?.toList() ?: emptyList(),
userMetadata = msg.userMetadata,
)
},
)
else -> SinkResponse.Failure(id, err ?: "unknown error")
}
}
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