/**
* Acquires a repository lock and begins a matching MDR transaction (shared lock for read, or
* exclusive lock for write). Typical usage is start of SQL statement preparation (e.g.
* readOnly=true for DML or query, false for DDL).
*
* @param readOnly if true, a shared lock is acquired on the catalog; otherwise, an exclusive lock
* is acquired
*/
public void beginLockedTxn(boolean readOnly) {
int level = (readOnly) ? 1 : 2;
// TODO jvs 24-Jan-2007: Get rid of downcast here and below by
// making all creation of FarragoReposTxnContext go through
// factory method interface on FarragoRepos.
((FarragoReposImpl) repos).lockRepos(level);
// Don't set lockLevel until we've successfully acquired the lock
lockLevel = level;
if (readOnly) {
beginReadTxn();
} else {
beginWriteTxn();
}
}
