Как Blinkit решил загадку производительности Android-приложения с помощью Droid Dex

// Make your app performance-aware with a single call
DroidDex.getPerformanceLevelLd(PerformanceClass.CPU)
    .observe(this) { level ->
        when (level) {
            PerformanceLevel.EXCELLENT -> enableBeastMode()
            PerformanceLevel.LOW -> activateSurvivalMode()
            else -> runBalancedMode()
        }
    }

enum class PerformanceClass {
    CPU,        // Total RAM, Core Count, CPU Frequency
    MEMORY,     // Heap Limit, Heap Remaining, Available RAM
    NETWORK,    // Bandwidth Strength, Download Speed, Signal Strength
    STORAGE,    // Available Storage
    BATTERY     // Remaining Charge + Charging Status + Health
}

// For image-heavy e-commerce feeds
val imageLoadingProfile = DroidDex.getWeightedPerformanceLevelLd(
    PerformanceClass.NETWORK to 3.0f,    // Network is king
    PerformanceClass.MEMORY to 2.0f,     // Memory for bitmap handling
    PerformanceClass.STORAGE to 1.0f     // Storage for caching
)

// For video streaming features  
val videoStreamingProfile = DroidDex.getWeightedPerformanceLevelLd(
    PerformanceClass.CPU to 2.5f,        // Decoding power
    PerformanceClass.NETWORK to 2.0f,    // Streaming bandwidth
    PerformanceClass.BATTERY to 1.5f     // Power consumption
)

class ImageLoader {
    
    fun loadProductImage(imageUrl: String, imageView: ImageView) {
        val performanceLevel = DroidDex.getWeightedPerformanceLevel(
            PerformanceClass.NETWORK to 2.5f,  // Bandwidth is critical
            PerformanceClass.MEMORY to 2.0f,   // Bitmap memory pressure
            PerformanceClass.STORAGE to 1.0f   // Cache availability
        )

        val config = when (performanceLevel) {
            PerformanceLevel.EXCELLENT -> ImageConfig(
                quality = 95,
                format = "avif",
                resolution = "2048x2048",
                enableProgressiveLoading = true
            )
            PerformanceLevel.HIGH -> ImageConfig(
                quality = 85,
                format = "webp", 
                resolution = "1024x1024",
                enableProgressiveLoading = true
            )
            PerformanceLevel.AVERAGE -> ImageConfig(
                quality = 70,
                format = "jpg",
                resolution = "512x512",
                enableProgressiveLoading = false
            )
            PerformanceLevel.LOW -> ImageConfig(
                quality = 50,
                format = "jpg",
                resolution = "256x256",
                enableProgressiveLoading = false
            )
        }
        
        // Load the image using config
    }
}

class APICacheHelper {
    
    private val dynamicCacheSize: Int
        get() {
            return when(DroidDex.getPerformanceLevel(PerformanceClass.MEMORY)) {
                PerformanceLevel.EXCELLENT -> {
                    val networkLevel = DroidDex.getPerformanceLevel(PerformanceClass.NETWORK)
                    
                    if (networkLevel <= PerformanceLevel.AVERAGE) {
                        40 * 1024 * 1024  // 40MB - aggressive caching for slow networks
                    } else {
                        30 * 1024 * 1024  // 30MB - balanced approach
                    }
                }
                PerformanceLevel.HIGH -> 20 * 1024 * 1024      // 20MB
                PerformanceLevel.AVERAGE -> 10 * 1024 * 1024   // 10MB  
                PerformanceLevel.LOW -> 0                      // Disable Caching
                else -> 10 * 1024 * 1024 // fallback
            }
        }
    
    private val intelligentCache by lazy {
        object : LruCache<String, ApiResponse>(dynamicCacheSize) {
            // Actual Implementation
        }
    }
    
    fun cacheResponse(key: String, response: ApiResponse) {
        val memoryPressure = DroidDex.getPerformanceLevel(PerformanceClass.MEMORY)

        // Skip caching on critically low memory devices
        if (memoryPressure == PerformanceLevel.LOW) {
            intelligentCache.clear()
            return
        }

        intelligentCache.resize(dynamicCacheSize)
        
        // Cache the response
    }
}

class VideoPlaybackManager {
    
    private val maxConcurrentVideos: Int
        get() {
            val cpuLevel = DroidDex.getPerformanceLevel(PerformanceClass.CPU)
            val memoryLevel = DroidDex.getPerformanceLevel(PerformanceClass.MEMORY)
            val batteryLevel = DroidDex.getPerformanceLevel(PerformanceClass.BATTERY)
            
            return when {
                // Beast mode
                cpuLevel >= PerformanceLevel.HIGH && 
                memoryLevel >= PerformanceLevel.HIGH && 
                batteryLevel >= PerformanceLevel.AVERAGE -> 4
                
                // Balanced mode
                cpuLevel >= PerformanceLevel.AVERAGE && 
                memoryLevel >= PerformanceLevel.AVERAGE -> 2
                
                // Survival mode: One video at a time
                else -> 1
            }
        }
    
    // Real-time adaptation to changing conditions
    private fun monitorPerformanceChanges() {
        DroidDex.getPerformanceLevelLd(
            PerformanceClass.CPU, 
            PerformanceClass.MEMORY, 
            PerformanceClass.BATTERY
        ).observe(lifecycleOwner) { _ ->
            val idealVideoCount = maxConcurrentVideos
            val currentVideoCount = activeVideoPlayers.size
            
            when {
                currentVideoCount > idealVideoCount -> {
                    // Performance degraded - cleanup least important videos
                    cleanupExcessVideos(currentVideoCount - idealVideoCount)
                }
                currentVideoCount < idealVideoCount && queuedVideos.isNotEmpty() -> {
                    // Performance improved - play queued videos
                    playQueuedVideos(idealVideoCount - currentVideoCount)
                }
            }
        }
    }
}

class AnimationManager {
    
    data class AnimationProfile(
        val enableSharedTransitions: Boolean,
        val animationDuration: Long,
        val enableParallaxEffects: Boolean
    )
    
    private val animationProfile: AnimationProfile
        get() {
            val cpuLevel = DroidDex.getPerformanceLevel(PerformanceClass.CPU)
            val memoryLevel = DroidDex.getPerformanceLevel(PerformanceClass.MEMORY)
            val batteryLevel = DroidDex.getPerformanceLevel(PerformanceClass.BATTERY)

            return when {
                // Premium experience for capable devices
                cpuLevel >= PerformanceLevel.HIGH && 
                memoryLevel >= PerformanceLevel.HIGH && 
                batteryLevel >= PerformanceLevel.AVERAGE -> {
                    AnimationProfile(
                        enableSharedTransitions = true,
                        animationDuration = 350L,
                        enableParallaxEffects = true
                    )
                }

                // Balanced experience  
                cpuLevel >= PerformanceLevel.AVERAGE && 
                memoryLevel >= PerformanceLevel.AVERAGE -> {
                    AnimationProfile(
                        enableSharedTransitions = true,
                        animationDuration = 250L,
                        enableParallaxEffects = false
                    )
                }

                // Simplified experience for budget devices
                else -> {
                    AnimationProfile(
                        enableSharedTransitions = false,
                        animationDuration = 150L,
                        enableParallaxEffects = false
                    )
                }
            }
        }

    // Use the animationProfile to perform actual transitions & animations
}