!453 优化文件缓存初始化效率

Merge pull request !453 from 刘海康/master

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 3.2.1-rc.0
 - Fix bug: CropTransformation is used to crop the original image
 - Fix bug: After calling the clear all file cache interfaces, the file cache becomes invalid 
+- Optimize the efficiency of file cache initialization.
 
 ## 3.2.0
 - When successfully requesting the network, return the httpcode as well

library/src/main/ets/cache/FileCache.ets

@@ -70,6 +70,7 @@ export class FileCache {
     interface CacheFileInfo {
       file: string;
       ctime: number;
+      size: number;
     }
 
     // 按照上次访问该文件的时间排序
@@ -78,26 +79,25 @@ export class FileCache {
       let stat: fs.Stat | undefined = await FileUtils.getInstance().Stat(this.path + filenames[i])
       cachefiles.push({
         file: filenames[i],
-        ctime: stat === undefined ? 0 : stat.ctime
+        ctime: stat === undefined ? 0 : stat.ctime,
+        size: stat?.size ?? 0
       })
     }
     let sortedCachefiles: CacheFileInfo[] = cachefiles.sort((a, b) => a.ctime - b.ctime)
 
     for (let i = 0; i < sortedCachefiles.length; i++) {
-      let buf: ArrayBuffer | undefined = await FileUtils.getInstance().readFile(this.path + sortedCachefiles[i].file)
+      const fileSize: number = sortedCachefiles[i].size;
-      if (buf !== undefined) {
       // 处理数量超过size的场景，移除即将排除的文件
       if (this.lruCache.length == this.maxSize && !this.lruCache.contains(sortedCachefiles[i].file)) {
         let remove: number | undefined = this.lruCache.remove(this.lruCache.keys()[0])
         if (remove !== undefined) {
           FileUtils.getInstance().deleteFile(this.path + this.lruCache.keys()[0])
-            this.removeMemorySize(buf)
+          this.removeMemorySize(fileSize)
         }
       }
 
-        this.lruCache.put(sortedCachefiles[i].file, buf.byteLength)
+      this.lruCache.put(sortedCachefiles[i].file, fileSize)
-        this.addMemorySize(buf)
+      this.addMemorySize(fileSize)
-      }
     }
 
     this.trimToSize();