Demonstration of adapting ruby methods with kwargs to kotlin interface

RubyCacheAdapter

# cache.rb
# Existing ruby cache implementation.  Uses kwargs

class Cache
  include RubyCache
  
  def set(key, value, ttl:)
    ...
  end
end


// RubyCache.kt
// Java interface to Ruby cache

interface RubyCache {
  fun set(key: String, value: Object, kwargs: Map<String, Object>)
}


// KotlinCache.kt
// Idiomatic kotlin interface for cache access

interface KotlinCache {
  fun set(key: String, value: Object, ttl: Duration?)
}


// RubyCacheAdapter.kt
// Adapts RubyCache interface to KotlinCache interface

class CacheAdapter(private val rubyCache: RubyCache): KotlinCache {
  override fun set(key: String, value: Object, ttl: Duration?) {
    rubyCache.set(key, value, mapOf("ttl" to ttl?.seconds))
  }
}