在Kotlin中有没有类似于Dart的Completer行为？

import kotlinx.coroutines.*
import kotlin.coroutines.*

fun main() {
    val completer = Completer<String>()

    GlobalScope.launch {
        delay(1000) // 模拟耗时操作

        if (completer.isActive()) {
            completer.complete("Operation completed successfully.")
        }
    }

    completer.await { result ->
        println(result)
    }

    // 防止程序立即退出
    Thread.sleep(2000)
}

class Completer<T> {
    private var deferred: CompletableDeferred<T>? = null

    fun isActive(): Boolean {
        return deferred != null && !deferred!!.isCancelled
    }

    fun complete(value: T) {
        if (isActive()) {
            deferred!!.complete(value)
        }
    }

    fun await(block: (T) -> Unit) {
        deferred = CompletableDeferred()

        GlobalScope.launch {
            val result = deferred!!.await()
            block(result)
        }
    }
}