Kotlin：使用 lambda 代替函数式接口

In Java we can do this Events.handler(Handshake.class, hs -> out.println(hs));

In Kotlin however I am trying to replicate the behavior to replace this:

Events.handler(Handshake::class, object : EventHandler<Handshake> {
    override fun handle(event: Handshake) {
        println(event.sent)
    }
})

With a more convenient:

Events.handler(Handshake::class, EventHandler<Handshake> { println(it.sent) })

For some reason in reference to EventHandler:

不过，更可取的是，我想使用更简短的内容，比如:

Or use the advertised feature to use the method like this: Events.handler(Handshake::class) { println(it.sent) }

这是我的Events件物品:

import java.util.*
import kotlin.reflect.KClass

object Events {

    private val map = HashMap<Class<*>, Set<EventHandler<*>>>()

    fun <T : Any> handler(eventType: KClass<T>, handler: EventHandler<T>) {
        handler(eventType.java, handler)
    }

    fun <T> handler(eventType: Class<T>, handler: EventHandler<T>) = handlers(eventType).add(handler)

    fun post(event: Any) = handlers(event.javaClass).forEach { it.handle(event) }

    operator fun plus(event: Any) = post(event)

    private fun <T> handlers(eventType: Class<T>): HashSet<EventHandler<T>> {
        var set = map[eventType]
        if (set == null) {
            set = HashSet<EventHandler<*>>()
            map.put(eventType, set)
        }
        return set as HashSet<EventHandler<T>>
    }

}

我的EventHandler界面:

@FunctionalInterface
interface EventHandler<T> {

    fun handle(event: T)

}