Debounce

Debounce.kt

open class Debouncer<T>(
    protected val scope: CoroutineScope,
    protected val period: Long
) {
    protected var scheduleJob: Job? = null
    protected var lastRan: Long = -period

    fun debounce(
        arg: T,
        block: suspend CoroutineScope.(T) -> Unit
    ): Boolean = debounce(arg, period, block)

    protected fun debounce(
        arg: T,
        delay: Long,
        block: suspend CoroutineScope.(T) -> Unit
    ): Boolean {
        synchronized(this@Debouncer) {
            scheduleJob?.cancel()
            scheduleJob = scope.launch {
                delay(delay)
                synchronized(this@Debouncer) {
                    scheduleJob = null
                    lastRan = System.currentTimeMillis()
                }
                block(arg)
            }
        }
        return true
    }
}