void onTransactionPurged(final TransactionIdentifier txId) {
final UnsignedLong id = UnsignedLong.fromLongBits(txId.getTransactionId());
closedTransactions.remove(id);
void onTransactionPurged(final TransactionIdentifier txId) {
final UnsignedLong id = UnsignedLong.fromLongBits(txId.getTransactionId());
closedTransactions.remove(id);