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refactor: embrace impl property delegates
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31 changes: 31 additions & 0 deletions
31
...ce-android-sdk/src/main/java/io/embrace/android/embracesdk/injection/InjectEmbraceImpl.kt
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package io.embrace.android.embracesdk.injection | ||
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import io.embrace.android.embracesdk.EmbraceImpl | ||
import io.embrace.android.embracesdk.internal.utils.Provider | ||
import kotlin.properties.ReadOnlyProperty | ||
import kotlin.reflect.KProperty | ||
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/** | ||
* Provides a lazy property delegate for fields in [EmbraceImpl]. If the SDK is not started, this will | ||
* return null. If it is started, the value will return the value from the provider. | ||
* | ||
* This is convenient syntax to avoid a large number of lateinit vars in [EmbraceImpl]. | ||
*/ | ||
internal inline fun <reified T> EmbraceImpl.embraceImplInject( | ||
noinline provider: Provider<T> | ||
): ReadOnlyProperty<Any?, T?> = EmbraceImplFieldDelegate(::isStarted, provider) | ||
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internal class EmbraceImplFieldDelegate<T>( | ||
private val startedCheck: () -> Boolean, | ||
provider: Provider<T> | ||
) : ReadOnlyProperty<Any?, T?> { | ||
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// optimization: use atomic checks rather than synchronized in lazy. | ||
// Taking out a lock is overkill for the vast majority of objects on the graph | ||
private val value: T by lazy(LazyThreadSafetyMode.PUBLICATION, provider) | ||
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override fun getValue(thisRef: Any?, property: KProperty<*>): T? = when { | ||
startedCheck() -> value | ||
else -> null // not started yet - don't resolve anything. | ||
} | ||
} |