Сам спросил, сам отвечу: class Component<T>(private val builder: () -> T)

Question

Сам спросил, сам отвечу: class Component<T>(private val builder: () -> T)

{
private var instance: T? = null

fun getInstance() = instance ?: builder().also { instance = it }

fun destroy(){
instance = null
}
}

Ну и пропертя:
private var mainComponent = Component<MainComponent>({ getAppComponent().mainComponentBuilder().build() })

Норм?

#kotlin #programming #russian

0

12.07.2018

1 ответов

13 просмотров

Andrey Antipov · Accepted Answer

Можно реализовать свой Lazy: class ResettableLazy<out T>(private val initializer: () -> T) : Lazy<T> { @Volatile private var t: T? = null override val value: T get() { val t1 = t if (t1 !== null) { return t1 } return synchronized(this) { val t2 = t if (t2 !== null) { t2 } else { val t3 = initializer() t = t3 t3 } } } override fun isInitialized(): Boolean = t !== null fun reset() = synchronized(this) { t = null } } typealias MainComponent = Int val mainComponentLazy = ResettableLazy(::initMainComponent) val mainComponent: MainComponent by mainComponentLazy private var i = 0 fun initMainComponent() = i++ fun main(args: Array<String>) { println(mainComponent) println(mainComponent) mainComponentLazy.reset() println(mainComponent) println(mainComponent) mainComponentLazy.reset() println(mainComponentLazy.value) println(mainComponentLazy.value) mainComponentLazy.reset() println(mainComponentLazy.value) println(mainComponentLazy.value) }

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Сам спросил, сам отвечу: class Component<T>(private val builder: () -> T)

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