io.github.wulkanowy.sdk.scrapper.ResettableLazyManager.kt Maven / Gradle / Ivy

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Unified way of retrieving data from the UONET+ register through mobile api and scraping api

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package io.github.wulkanowy.sdk.scrapper

import java.util.LinkedList
import kotlin.reflect.KProperty

/**
 * see https://stackoverflow.com/a/35757638/6695449
 */
internal class ResettableLazyManager {
    // we synchronize to make sure the timing of a reset() call and new inits do not collide
    val managedDelegates = LinkedList()

    fun register(managed: Resettable) {
        synchronized(managedDelegates) {
            managedDelegates.add(managed)
        }
    }

    fun reset() {
        synchronized(managedDelegates) {
            managedDelegates.forEach { it.reset() }
            managedDelegates.clear()
        }
    }
}

internal interface Resettable {
    fun reset()
}

internal class ResettableLazy(val manager: ResettableLazyManager, val init: () -> PROPTYPE) : Resettable {
    @Volatile
    var lazyHolder = makeInitBlock()

    operator fun getValue(thisRef: Any?, property: KProperty<*>): PROPTYPE {
        return lazyHolder.value
    }

    override fun reset() {
        lazyHolder = makeInitBlock()
    }

    fun makeInitBlock(): Lazy {
        return lazy {
            manager.register(this)
            init()
        }
    }
}

internal fun  resettableLazy(manager: ResettableLazyManager, init: () -> PROPTYPE): ResettableLazy {
    return ResettableLazy(manager, init)
}

internal fun resettableManager(): ResettableLazyManager = ResettableLazyManager()