304 lines
8.1 KiB
Kotlin
304 lines
8.1 KiB
Kotlin
package jp.juggler.subwaytooter.util
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import android.content.Context
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import android.graphics.Bitmap
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import android.graphics.BitmapFactory
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import android.os.Handler
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import android.os.SystemClock
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import java.io.ByteArrayInputStream
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import java.lang.ref.WeakReference
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import java.util.ArrayList
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import java.util.LinkedList
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import java.util.concurrent.ConcurrentHashMap
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import jp.juggler.subwaytooter.App1
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import jp.juggler.subwaytooter.span.NetworkEmojiSpan
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import jp.juggler.apng.ApngFrames
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class CustomEmojiCache(internal val context : Context) {
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companion object {
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private val log = LogCategory("CustomEmojiCache")
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internal const val DEBUG = false
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internal const val CACHE_MAX = 512 // 使用中のビットマップは掃除しないので、頻度によってはこれより多くなることもある
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internal const val ERROR_EXPIRE = 60000L * 10
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private val elapsedTime : Long
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get() = SystemClock.elapsedRealtime()
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}
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private class CacheItem(val url : String, var frames : ApngFrames?) {
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var time_used : Long = elapsedTime
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}
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private class Request(
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val refTarget : WeakReference<Any>,
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val url : String,
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val onLoadComplete : ()->Unit
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)
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////////////////////////////////
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// 成功キャッシュ
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private val cache : ConcurrentHashMap<String, CacheItem>
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// エラーキャッシュ
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private val cache_error = ConcurrentHashMap<String, Long>()
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private val cache_error_item = CacheItem("error", null)
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// リクエストキュー
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// キャンセル操作の都合上、アクセス時に排他が必要
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private val queue = LinkedList<Request>()
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private val handler : Handler
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private val worker : Worker
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init {
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handler = Handler(context.mainLooper)
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cache = ConcurrentHashMap()
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worker = Worker()
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worker.start()
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}
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// カラムのリロードボタンを押したタイミングでエラーキャッシュをクリアする
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fun clearErrorCache() {
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cache_error.clear()
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}
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// tag_target を持つリクエストまたはtagがGCされたリクエストをキューから除去する
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fun cancelRequest(refTarget : WeakReference<Any>) {
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val targetTag = refTarget.get() ?: return
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synchronized(queue) {
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val it = queue.iterator()
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while(it.hasNext()) {
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val request = it.next()
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val tag = request.refTarget.get()
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if(tag === null || tag === targetTag) it.remove()
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}
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}
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}
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private fun getCached(now : Long, url : String) : CacheItem? {
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// 成功キャッシュ
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val item = cache[url]
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if(item != null) {
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item.time_used = now
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return item
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}
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// エラーキャッシュ
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val time_error = cache_error[url]
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if(time_error != null && now < time_error + ERROR_EXPIRE) {
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return cache_error_item
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}
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return null
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}
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fun getFrames(refDrawTarget: WeakReference<Any>?, url : String, onLoadComplete : ()->Unit) : ApngFrames? {
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try {
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if( refDrawTarget?.get() == null ){
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NetworkEmojiSpan.log.e("draw: DrawTarget is null ")
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return null
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}
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cancelRequest(refDrawTarget)
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synchronized(cache) {
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val item = getCached(elapsedTime, url)
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if(item != null) return item.frames
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}
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// キャンセル操作の都合上、排他が必要
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synchronized(queue) {
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queue.addLast(Request(refDrawTarget, url, onLoadComplete))
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}
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worker.notifyEx()
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} catch(ex : Throwable) {
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log.trace(ex)
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// たまにcache変数がなぜかnullになる端末があるらしい
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}
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return null
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}
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private inner class Worker : WorkerBase() {
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override fun cancel() {
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// このスレッドはプロセスが生きてる限りキャンセルされない
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}
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override fun run() {
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while(true) {
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try {
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var queue_size : Int = -1
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val request = synchronized(queue) {
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val x = if(queue.isNotEmpty()) queue.removeFirst() else null
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queue_size = queue.size
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return@synchronized x
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}
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if(request == null) {
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if(DEBUG) log.d("wait")
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waitEx(86400000L)
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continue
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}
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// 描画先がGCされたなら何もしない
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request.refTarget.get() ?: continue
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var cache_size : Int = - 1
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if(synchronized(cache) {
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val now = elapsedTime
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val item = getCached(now, request.url)
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if(item != null) {
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if(item.frames != null) {
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fireCallback(request)
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}
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return@synchronized true
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}
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sweep_cache(now)
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cache_size = cache.size
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return@synchronized false
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}) continue
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if(DEBUG)
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log.d("start get image. queue_size=%d, cache_size=%d url=%s", queue_size, cache_size, request.url)
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var frames : ApngFrames? = null
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try {
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val data = App1.getHttpCached(request.url)
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if(data == null) {
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log.e("get failed. url=%s", request.url)
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} else {
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frames = decodeAPNG(data, request.url)
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}
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} catch(ex : Throwable) {
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log.trace(ex)
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}
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synchronized(cache) {
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if(frames == null) {
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cache_error.put(request.url, elapsedTime)
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} else {
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// 古いキャッシュがある
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var item : CacheItem? = cache[request.url]
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if(item == null) {
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item = CacheItem(request.url, frames)
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cache[request.url] = item
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} else {
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item.frames?.dispose()
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item.frames = frames
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}
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fireCallback(request)
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}
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}
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} catch(ex : Throwable) {
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log.trace(ex)
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// Fujitsu F-01H（F01H）, 2048MB RAM, Android 6.0
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// java.lang.NullPointerException:
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// at java.util.concurrent.ConcurrentHashMap.get (ConcurrentHashMap.java:772)
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// at jp.juggler.subwaytooter.util.CustomEmojiCache$Worker.run (CustomEmojiCache.java:183)
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waitEx(3000L)
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}
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}
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}
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private fun fireCallback(request : Request) {
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handler.post { request.onLoadComplete() }
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}
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private fun sweep_cache(now : Long) {
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// キャッシュ限界を超過した数
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val over = cache.size - CACHE_MAX
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// 超過した数がある程度大きくなるまで掃除しない
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if(over <= 64) return
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// 掃除する候補
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val list = ArrayList<CacheItem>()
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for(item in cache.values) {
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// 最近使われていないものが掃除対象
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if(now - item.time_used > 1000L) list.add(item)
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}
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// 昇順ソート
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list.sortBy { it.time_used }
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// 古い物から順に捨てる
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var removed = 0
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for(item in list) {
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cache.remove(item.url)
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item.frames?.dispose()
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if( ++removed >= over) break
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}
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}
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private fun decodeAPNG(data : ByteArray, url : String) : ApngFrames? {
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try {
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// PNGヘッダを確認
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if( data.size >= 8
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&& (data[0].toInt() and 0xff) == 0x89
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&& (data[1].toInt() and 0xff) == 0x50
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){
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// APNGをデコード
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return ApngFrames.parseApng(ByteArrayInputStream(data), 64)
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}
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// fall thru
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} catch(ex : Throwable) {
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if(DEBUG) log.trace(ex)
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log.e(ex, "PNG decode failed. %s ", url)
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}
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// 通常のビットマップでのロードを試みる
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try {
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val b = decodeBitmap(data, 128)
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if(b != null) {
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if(DEBUG) log.d("bitmap decoded.")
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return ApngFrames(b)
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} else {
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log.e("Bitmap decode returns null. %s", url)
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}
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} catch(ex : Throwable) {
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log.e(ex, "Bitmap decode failed. %s", url)
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}
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return null
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}
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private val options = BitmapFactory.Options()
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private fun decodeBitmap(data : ByteArray, pixel_max : Int) : Bitmap? {
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options.inJustDecodeBounds = true
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options.inScaled = false
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options.outWidth = 0
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options.outHeight = 0
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BitmapFactory.decodeByteArray(data, 0, data.size, options)
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var w = options.outWidth
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var h = options.outHeight
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if(w <= 0 || h <= 0) {
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log.e("can't decode bounds.")
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return null
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}
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var bits = 0
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while(w > pixel_max || h > pixel_max) {
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++ bits
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w = w shr 1
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h = h shr 1
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}
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options.inJustDecodeBounds = false
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options.inSampleSize = 1 shl bits
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return BitmapFactory.decodeByteArray(data, 0, data.size, options)
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}
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}
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}
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