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| interface IResettable { | |
| fun reset() | |
| } | |
| open class ResettableAspect: IResettable { | |
| val delegateManager by lazy { | |
| ResettableDelegateManager() | |
| } | |
| override fun reset() { | |
| delegateManager.reset() | |
| } | |
| } | |
| class ResettableDelegateManager : IResettable { | |
| val delegates = LinkedList<IResettable>() | |
| override fun reset() { | |
| delegates.forEach { | |
| it.reset() | |
| } | |
| } | |
| fun <PROPTYPE> register(instance: ResettableDelegate<PROPTYPE>) { | |
| delegates.add(instance) | |
| } | |
| } | |
| class ResettableDelegate<PROPTYPE>(sourceManager: ResettableDelegateManager, val init: () -> PROPTYPE) : ReadWriteProperty<Any?, PROPTYPE>, IResettable { | |
| init { | |
| sourceManager.register(this) | |
| } | |
| var currentValue = init() | |
| override operator fun getValue(thisRef: Any?, property: KProperty<*>): PROPTYPE { | |
| return currentValue | |
| } | |
| override fun setValue(thisRef: Any?, property: KProperty<*>, value: PROPTYPE) { | |
| currentValue = value | |
| } | |
| override fun reset() { | |
| currentValue = init() | |
| } | |
| } | |
| // usage | |
| object Measurement: ResettableAspect() { | |
| var loadTimeStart by ResettableDelegate(delegateManager) { 0L } | |
| var loadTimeEnd by ResettableDelegate(delegateManager) { 0L } | |
| } | |
| 3AFA | |
| fun main() { | |
| Measurement.loadTimeStart = now() // presudo | |
| ... | |
| Measurement.loadTimeEnd = now() // presudo | |
| val diff = Measurement.loadTimeEnd - Measurement.loadTimeStart | |
| println("it takes $diff ms!) | |
| Measurement.reset() | |
| } |
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