/** add session to the end of queue when a transaction starts (depending on isolation mode) */
public void beginAction(Session session, Statement cs) {
if (session.hasLocks(cs)) {
return;
}
writeLock.lock();
try {
if (cs.getCompileTimestamp() < database.schemaManager.getSchemaChangeTimestamp()) {
cs = session.statementManager.getStatement(session, cs);
session.sessionContext.currentStatement = cs;
if (cs == null) {
return;
}
}
boolean canProceed = setWaitedSessionsTPL(session, cs);
if (canProceed) {
if (session.tempSet.isEmpty()) {
lockTablesTPL(session, cs);
// we don't set other sessions that would now be waiting for this one too
} else {
setWaitingSessionTPL(session);
}
} else {
session.abortTransaction = true;
}
} finally {
writeLock.unlock();
}
}
/** add session to the end of queue when a transaction starts (depending on isolation mode) */
public void beginAction(Session session, Statement cs) {
synchronized (liveTransactionTimestamps) {
session.actionTimestamp = nextChangeTimestamp();
if (!session.isTransaction) {
session.transactionTimestamp = session.actionTimestamp;
session.isTransaction = true;
liveTransactionTimestamps.addLast(session.actionTimestamp);
}
}
if (session.hasLocks()) {
return;
}
try {
writeLock.lock();
boolean canProceed = beginActionTPL(session, cs);
if (!canProceed) {
session.abortTransaction = true;
}
} finally {
writeLock.unlock();
}
}