Question

如果您有类似的回调并且想知道它们何时触发，我为基本用例编写了以下代码。

它包装回调并跟踪其进度：

//Triggers a callback when all supplied callbacks have been called at least once
class CallbackLatch(
    private val numberOfCallbacks: Int,
    private val callback: () -> Unit
) {
    private var autoIdCounter = 0
    private val progress = mutableMapOf<Int, Int>()

    fun <T> track(function: (input: T) -> Unit): (input: T) -> Unit {
        val callbackId = autoIdCounter++
        progress.putIfAbsent(callbackId, 0)
        return {
            function(it)
            updateProgress(callbackId)
        }
    }

    private fun updateProgress(id: Int) {
        progress.apply {
            this[id] = 1 + this.getOrElse(id) {0}
            if (values.all { it > 0 } && values.size >= numberOfCallbacks) {
            callback()
            }
        }
    }
}

我想避免编写多个跟踪方法，例如：

fun <T> track(function: (input: T) -> Unit): (input: T) -> Unit
fun <T, U> track(function: (i1: T, i2: U) -> Unit): (i1: T, i2: U) -> Unit
fun <T, U ,V> track(function: (i1: T, i2: U, i3: V) -> Unit): (i1: T, i2: U, i3: V) -> Unit

是否可以，track方法的方法签名是什么？（很抱歉，如果重复的话，我找不到）

在Kotlin中包装任何类型的功能

0 个答案: