@Override
      public int compare(DiskStorage.Entry e1, DiskStorage.Entry e2) {
        long time1 = e1.getTimestamp();
        long time2 = e2.getTimestamp();
        return time1 < time2 ? -1 : ((time2 == time1) ? 0 : 1);
      }
Sorts entries by date of the last access, evicting old ones first
imagepipeline-base/src/main/java/com/facebook/cache/disk/DefaultEntryEvictionComparatorSupplier.java