@Override
            public void run() {
              synchronized (mLock) {
                maybeUpdateFileCacheSize();
              }
              mIndexReady = true;
              mCountDownLatch.countDown();
            }
Stats about the cache - currently size of the cache (in bytes) and number of items in the cache
imagepipeline-base/src/main/java/com/facebook/cache/disk/DiskStorageCache.java