JENA-1089, JENA-1131
DatasetGraphs now support the Transactional interface, rather than it
being an optional extra. Dataset itself already had Transactional.
Implementations of DatasetGraph now need to opt out of transactions via
the TransactionalNotSupported interface.
DatasetGraph and Dataset provide
supportTransactions() : begin/commit/end
supportTransactionAbort() : and also abort.
Some of the compound DSGs can't provide abort properly. Crashing out of
a transaction with an exception needs proper abort.
DatasetGraphText provides abort if and only if the underlying data does.
jena-text is the most complicated part of the changes. All the tests
pass but if you are a big user of jena-text with update it would be
worth checking the changes.
Rob - I switched the tests for jena-jdbc-driver-mem to use the
transaction memory dataset implementation. In the course of that, I
found and fixed an oddity in jena-jdbc-driver-mem:MemConnection. The
code comments discuss the initialization issue.
Andy
