Editor edit(String key, long expectedSequenceNumber) should throw ConcurrentModificationException about disklrucache HOT 3 OPEN

Clients call edit() to create or update the values of an entry. An entry may have only one editor at one time; if a value is not available to be edited then edit() will return null.

ref: https://github.com/JakeWharton/DiskLruCache/blob/master/src/main/java/com/jakewharton/DiskLruCache.java#L68

from disklrucache.

It should definitely not throw a ConcurrentModificationException as that's a RuntimeException. I think it would be valid to throw IOException (as we can't open the file) and then state that it never returns null.

from disklrucache.

It should NOT throw ANYTHING, it should successfully return another Editor and allow concurrent modification of cache.

from disklrucache.