/** Begins a new read-only transaction. */
public void beginReadTxn() {
assert (!isTxnInProgress());
if (manageReposSession) {
repos.beginReposSession();
}
repos.beginReposTxn(false);
state = State.READ_TXN;
}
/** Rolls back the active transaction, if any. */
public void rollback() {
if (!isTxnInProgress()) {
return;
}
// NOTE jvs 12-Jan-2007: see comment in commit() for ordering rationale
state = State.NO_TXN;
repos.endReposTxn(true);
if (manageReposSession) {
repos.endReposSession();
}
}
/** Commits the active transaction, if any. */
public void commit() {
if (!isTxnInProgress()) {
return;
}
// NOTE jvs 12-Jan-2007: change state BEFORE attempting
// to end transaction; if endReposTxn throws an excn,
// we're in an unknown state, but further calls could just
// mask the original excn, so pretend we're back to
// State.NO_TXN regardless.
state = State.NO_TXN;
repos.endReposTxn(false);
if (manageReposSession) {
repos.endReposSession();
}
}
/** Begins a new read/write transaction. */
public void beginWriteTxn() {
assert (!isTxnInProgress());
if (readOnly) {
throw FarragoResource.instance().CatalogReadOnly.ex();
}
if (manageReposSession) {
repos.beginReposSession();
}
// NOTE jvs 12-Jan-2007: don't change state until AFTER successfully
// beginning a transaction; if beginReposTxn throws an excn,
// we want to stay in State.NO_TXN
repos.beginReposTxn(true);
state = State.WRITE_TXN;
}