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46 lines
1.7 KiB
Kotlin
46 lines
1.7 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.perf
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import mozilla.components.support.base.log.logger.Logger
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import java.util.concurrent.atomic.AtomicInteger
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private val logger = Logger("LazyMonitored")
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/**
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* A container for the number of components initialized.
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*/
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object ComponentInitCount {
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val count = AtomicInteger(0)
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}
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/**
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* A convenience function for setting the [LazyMonitored] property delegate, which wraps
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* [lazy] to add performance monitoring.
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*/
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fun <T> lazyMonitored(initializer: () -> T): Lazy<T> = LazyMonitored(initializer)
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/**
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* A wrapper around the [lazy] property delegate to monitor for performance related issues.
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* For example, we can count the number of components initialized to see how the number of
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* components initialized on start up impacts start up time.
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*/
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private class LazyMonitored<T>(initializer: () -> T) : Lazy<T> {
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// Lazy is thread safe.
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private val lazyValue = lazy {
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// We're unlikely to have 4 billion components so we don't handle overflow.
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val componentInitCount = ComponentInitCount.count.incrementAndGet()
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initializer().also {
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@Suppress("UNNECESSARY_NOT_NULL_ASSERTION") // the compiler fails with !! but warns with !!.
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val className = if (it == null) "null" else it!!::class.java.canonicalName
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logger.debug("Init component #$componentInitCount: $className")
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}
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}
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override val value: T get() = lazyValue.value
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override fun isInitialized(): Boolean = lazyValue.isInitialized()
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}
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