public interface TxnIntCallable
TxnExecutor.
This transactional callable is optimized for retuning a primitive type: int. Using this TxnIntCallable instead of
the TxnCallable is that no object wrapper needs to be created and there is no reason to deal with a potential
null value.int call(Txn txn) throws java.lang.Exception
txn - the Transaction. Depending on the txn PropagationLevel, this could
be null.java.lang.Exception