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Implement caching mechanism for base64
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134 changes: 134 additions & 0 deletions
134
.../main/kotlin/com/datadog/android/sessionreplay/internal/recorder/base64/Base64LRUCache.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| /* | ||
| * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0. | ||
| * This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
| * Copyright 2016-Present Datadog, Inc. | ||
| */ | ||
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| package com.datadog.android.sessionreplay.internal.recorder.base64 | ||
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| import android.content.ComponentCallbacks2 | ||
| import android.content.res.Configuration | ||
| import android.graphics.drawable.AnimationDrawable | ||
| import android.graphics.drawable.Drawable | ||
| import android.graphics.drawable.DrawableContainer | ||
| import android.graphics.drawable.LayerDrawable | ||
| import android.util.LruCache | ||
| import androidx.annotation.VisibleForTesting | ||
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| internal object Base64LRUCache : Cache<Drawable, String>, ComponentCallbacks2 { | ||
| @Suppress("MagicNumber") | ||
| val MAX_CACHE_MEMORY_SIZE_BYTES = 4 * 1024 * 1024 // 4MB | ||
| @Suppress("MagicNumber") | ||
| private val ON_LOW_MEMORY_SIZE_BYTES = MAX_CACHE_MEMORY_SIZE_BYTES / 2 // 50% size | ||
| @Suppress("MagicNumber") | ||
| private val ON_MODERATE_MEMORY_SIZE_BYTES = (MAX_CACHE_MEMORY_SIZE_BYTES / 4) * 3 // 75% size | ||
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| private var cache: LruCache<String, ByteArray> = object : | ||
| LruCache<String, ByteArray>(MAX_CACHE_MEMORY_SIZE_BYTES) { | ||
| override fun sizeOf(key: String?, value: ByteArray): Int { | ||
| return value.size | ||
| } | ||
| } | ||
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| override fun onTrimMemory(level: Int) { | ||
| when (level) { | ||
| ComponentCallbacks2.TRIM_MEMORY_BACKGROUND -> { | ||
| cache.evictAll() | ||
| } | ||
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| ComponentCallbacks2.TRIM_MEMORY_COMPLETE -> { | ||
| cache.evictAll() | ||
| } | ||
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| ComponentCallbacks2.TRIM_MEMORY_MODERATE -> { | ||
| cache.trimToSize(ON_MODERATE_MEMORY_SIZE_BYTES) | ||
| } | ||
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| ComponentCallbacks2.TRIM_MEMORY_RUNNING_CRITICAL -> { | ||
| cache.evictAll() | ||
| } | ||
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| ComponentCallbacks2.TRIM_MEMORY_RUNNING_LOW -> { | ||
| cache.trimToSize(ON_LOW_MEMORY_SIZE_BYTES) | ||
| } | ||
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| ComponentCallbacks2.TRIM_MEMORY_RUNNING_MODERATE -> { | ||
| cache.trimToSize(ON_MODERATE_MEMORY_SIZE_BYTES) | ||
| } | ||
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| ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN -> { | ||
| cache.evictAll() | ||
| } | ||
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| else -> { | ||
| cache.evictAll() | ||
| } | ||
| } | ||
| } | ||
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| override fun onConfigurationChanged(newConfig: Configuration) {} | ||
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| override fun onLowMemory() { | ||
| cache.evictAll() | ||
| } | ||
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| @VisibleForTesting | ||
| internal fun setBackingCache(cache: LruCache<String, ByteArray>) { | ||
| this.cache = cache | ||
| } | ||
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| @Synchronized | ||
| override fun put(element: Drawable, value: String) { | ||
| val key = generateKey(element) | ||
| val byteArray = value.toByteArray(Charsets.UTF_8) | ||
| cache.put(key, byteArray) | ||
| } | ||
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| @Synchronized | ||
| override fun get(element: Drawable): String? = | ||
| cache.get(generateKey(element))?.let { | ||
| String(it) | ||
| } | ||
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| @Synchronized | ||
| override fun size(): Int = cache.size() | ||
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| @Synchronized | ||
| override fun clear() { | ||
| cache.evictAll() | ||
| } | ||
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| private fun generateKey(drawable: Drawable): String = | ||
| generatePrefix(drawable) + System.identityHashCode(drawable) | ||
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| private fun generatePrefix(drawable: Drawable): String { | ||
| return when (drawable) { | ||
| is DrawableContainer -> getPrefixForDrawableContainer(drawable) | ||
| is LayerDrawable -> getPrefixForLayerDrawable(drawable) | ||
| else -> "" | ||
| } | ||
| } | ||
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| private fun getPrefixForDrawableContainer(drawable: DrawableContainer): String { | ||
| if (drawable !is AnimationDrawable) { | ||
| return drawable.state.joinToString(separator = "", postfix = "-") | ||
| } | ||
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| return "" | ||
| } | ||
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| private fun getPrefixForLayerDrawable(drawable: LayerDrawable): String { | ||
| return if (drawable.numberOfLayers > 1) { | ||
| val sb = StringBuilder() | ||
| for (index in 0 until drawable.numberOfLayers) { | ||
| val layer = drawable.getDrawable(index) | ||
| val layerHash = System.identityHashCode(layer).toString() | ||
| sb.append(layerHash) | ||
| sb.append("-") | ||
| } | ||
| "$sb" | ||
| } else { | ||
| "" | ||
| } | ||
| } | ||
| } |
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