/* package */
DbSequence openSequence(final Db db, final DbTxn txn, final DatabaseEntry key)
throws DatabaseException {
final DbSequence seq = createSequence(db);
// The DB_THREAD flag is inherited from the database
boolean threaded = ((db.get_open_flags() & DbConstants.DB_THREAD) != 0);
int openFlags = 0;
openFlags |= allowCreate ? DbConstants.DB_CREATE : 0;
openFlags |= exclusiveCreate ? DbConstants.DB_EXCL : 0;
openFlags |= threaded ? DbConstants.DB_THREAD : 0;
if (db.get_transactional() && txn == null) openFlags |= DbConstants.DB_AUTO_COMMIT;
configureSequence(seq, DEFAULT);
boolean succeeded = false;
try {
seq.open(txn, key, openFlags);
succeeded = true;
return seq;
} finally {
if (!succeeded)
try {
seq.close(0);
} catch (Throwable t) {
// Ignore it -- an exception is already in flight.
}
}
}
/* package */
void configureSequence(final DbSequence seq, final SequenceConfig oldConfig)
throws DatabaseException {
int seqFlags = 0;
seqFlags |= decrement ? DbConstants.DB_SEQ_DEC : DbConstants.DB_SEQ_INC;
seqFlags |= wrap ? DbConstants.DB_SEQ_WRAP : 0;
if (seqFlags != 0) seq.set_flags(seqFlags);
if (rangeMin != oldConfig.rangeMin || rangeMax != oldConfig.rangeMax)
seq.set_range(rangeMin, rangeMax);
if (initialValue != oldConfig.initialValue) seq.initial_value(initialValue);
if (cacheSize != oldConfig.cacheSize) seq.set_cachesize(cacheSize);
}
/* package */
SequenceConfig(final DbSequence seq) throws DatabaseException {
// XXX: can't get open flags
final int openFlags = 0;
allowCreate = (openFlags & DbConstants.DB_CREATE) != 0;
exclusiveCreate = (openFlags & DbConstants.DB_EXCL) != 0;
final int seqFlags = seq.get_flags();
decrement = (seqFlags & DbConstants.DB_SEQ_DEC) != 0;
wrap = (seqFlags & DbConstants.DB_SEQ_WRAP) != 0;
// XXX: can't get initial value
final long initialValue = 0;
cacheSize = seq.get_cachesize();
rangeMin = seq.get_range_min();
rangeMax = seq.get_range_max();
}