ru.hnau.jutils.cache.AsyncAutoPossibleCache.kt Maven / Gradle / Ivy

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JUtils

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package ru.hnau.jutils.cache

import ru.hnau.jutils.finisher.Finisher
import ru.hnau.jutils.finisher.awaitError
import ru.hnau.jutils.possible.Possible


open class AsyncAutoPossibleCache(
        private val getter: (K) -> Finisher>,
        capacity: Int
) : Cache>>(
        capacity
) {

    operator fun get(key: K) = getValue(key) ?: run {
        synchronized(this@AsyncAutoPossibleCache) {
            val finisher = getter.invoke(key)
            putValue(key, finisher)
            finisher.awaitError {
                removeValue(key)
            }
            return@synchronized finisher
        }
    }

}