public ModificationQueue finishTx() {
final TransactionReference tx = transactions.get();
ModificationQueue modificationQueue = null;
if (tx != null) {
if (tx.isToplevel()) {
modificationQueue = queues.get();
final Set<String> synchronizationKeys = modificationQueue.getSynchronizationKeys();
// cleanup
queues.remove();
buffers.remove();
currentCommand.remove();
transactions.remove();
try {
tx.close();
} catch (Throwable t) {
t.printStackTrace();
} finally {
// release semaphores as the transaction is now finished
semaphore.release(synchronizationKeys); // careful: this can be null
}
} else {
tx.end();
}
}
return modificationQueue;
}
