MojErr MojDbIndex::find(MojDbCursor& cursor, MojDbWatcher* watcher, MojDbReq& req)
{
LOG_TRACE("Entering function %s", __FUNCTION__);
MojAssert(isOpen());
MojAutoPtr<MojDbQueryPlan> plan(new MojDbQueryPlan(*m_kindEngine));
MojAllocCheck(plan.get());
MojErr err = plan->init(cursor.query(), *this);
MojErrCheck(err);
if (watcher) {
// we have to add the watch before beginning the txn or we may miss events
MojAssert(cursor.txn() == NULL);
err = addWatch(*plan, cursor, watcher, req);
MojErrCheck(err);
}
if (!cursor.txn()) {
MojDbStorageTxn* txn = req.txn();
bool cursorOwnsTxn = !(req.batch() || txn);
if (txn) {
cursor.txn(txn, cursorOwnsTxn);
} else {
MojRefCountedPtr<MojDbStorageTxn> localTxn;
err = m_collection->beginTxn(localTxn);
MojErrCheck(err);
cursor.txn(localTxn.get(), cursorOwnsTxn);
req.txn(localTxn.get());
}
}
cursor.m_dbIndex = this; // for debugging
err = m_collection->find(plan, cursor.txn(), cursor.m_storageQuery);
MojErrCheck(err);
cursor.m_watcher = watcher;
return MojErrNone;
}
MojErr MojDbKind::find(MojDbCursor& cursor, MojDbWatcher* watcher, MojDbReq& req, MojDbOp op)
{
MojLogTrace(s_log);
MojErr err = checkPermission(op, req);
MojErrCheck(err);
const MojDbQuery& query = cursor.query();
MojDbIndex* index = indexForQuery(query);
if (index == NULL)
MojErrThrow(MojErrDbNoIndexForQuery);
cursor.m_dbIndex = index;
MojLogInfo(s_log, _T("Dbkind_find: Kind: %s, UsingIndex: %s, order: %s, limit: %d \n"), m_id.data(), index->name().data(),
query.order().data(), (int)query.limit());
err = index->find(cursor, watcher, req);
MojErrCheck(err);
return MojErrNone;
}