@Override
        public Void call() throws Exception {
            touchInBackground(file);
            return null;
        }
{@link DiskUsage} that uses LRU (Least Recently Used) strategy to trim cache.

@author Alexey Danilov (danikula@gmail.com).
dkplayer-videocache/src/main/java/com/danikula/videocache/file/LruDiskUsage.java