Kotlin Rules Engine

Open source Kotlin rules engine with coroutine support. Idiomatic API for business rule evaluation on JVM and Android.

Step 1

Add the Dependency

Add the GoRules engine to your Gradle project.

// build.gradle.kts
dependencies {
    implementation("io.gorules:zen-engine:0.29.2")
}

Step 2

Load a Decision

Create an engine and load your decision graph.

import io.gorules.zen.ZenEngine
import java.nio.file.Path

val engine = ZenEngine()
val content = Path.of("./decision.json").toFile().readText()
val decision = engine.createDecision(content)

Step 3

Evaluate Rules

Pass your input data and receive the decision result.

val input = mapOf(
    "customer" to mapOf("tier" to "premium", "country" to "US"),
    "cart" to mapOf("total" to 150, "items" to 3)
)

val result = decision.evaluate(input)
println(result.result)
// {discount=15, freeShipping=true}

Why Kotlin?

Built for performance and developer experience

Kotlin-Native API

Idiomatic Kotlin with extension functions, null-safety, and type inference throughout.

Coroutine Support

Suspend functions for non-blocking rule evaluation. Perfect for Ktor and other async frameworks.

Android Compatible

Full Android support for embedding business rules directly in mobile applications.

About the Kotlin SDK

GoRules provides first-class Kotlin support for business rules management. Built on our Java SDK with Kotlin-specific extensions, it delivers an idiomatic development experience with coroutine support and type-safe builders.

The Kotlin SDK embraces modern JVM development practices with suspend functions, extension methods, and null-safety throughout. Whether you're building with Ktor, Spring Boot, or Android applications, GoRules integrates naturally with your Kotlin codebase.

Leverage Kotlin's expressive syntax alongside GoRules' powerful rule engine. The SDK supports all GoRules features including decision tables, expressions, and complex rule graphs, all accessible through a clean, Kotlin-native API.