/** Returns the XA resource. */
void enableLocalTransactionOptimization(boolean enableOptimization) {
if (_xaResource == null) _isXATransaction = false;
else if (_localTransaction == null) _isXATransaction = true;
else if (!_cm.isLocalTransactionOptimization()) _isXATransaction = true;
else if (!_cm.isShareable()) _isXATransaction = true;
else _isXATransaction = !enableOptimization;
}
