BSONObj KVCatalog::_findEntry(OperationContext* opCtx, StringData ns, RecordId* out) const {
std::unique_ptr<Lock::ResourceLock> rLk;
if (!_isRsThreadSafe && opCtx->lockState()) {
rLk.reset(new Lock::ResourceLock(opCtx->lockState(), resourceIdCatalogMetadata, MODE_S));
}
RecordId dl;
{
stdx::lock_guard<stdx::mutex> lk(_identsLock);
NSToIdentMap::const_iterator it = _idents.find(ns.toString());
invariant(it != _idents.end());
dl = it->second.storedLoc;
}
LOG(1) << "looking up metadata for: " << ns << " @ " << dl;
RecordData data;
if (!_rs->findRecord(opCtx, dl, &data)) {
// since the in memory meta data isn't managed with mvcc
// its possible for different transactions to see slightly
// different things, which is ok via the locking above.
return BSONObj();
}
if (out)
*out = dl;
return data.releaseToBson().getOwned();
}
bool Collection::findDoc(OperationContext* txn, const RecordId& loc, BSONObj* out) const {
RecordData rd;
if ( !_recordStore->findRecord( txn, loc, &rd ) )
return false;
*out = rd.releaseToBson();
return true;
}
Status Collection::aboutToDeleteCapped(OperationContext* txn,
const RecordId& loc,
RecordData data) {
/* check if any cursors point to us. if so, advance them. */
_cursorManager.invalidateDocument(txn, loc, INVALIDATION_DELETION);
BSONObj doc = data.releaseToBson();
_indexCatalog.unindexRecord(txn, doc, loc, false);
return Status::OK();
}
bool Collection::findDoc(OperationContext* txn,
const RecordId& loc,
Snapshotted<BSONObj>* out) const {
dassert(txn->lockState()->isCollectionLockedForMode(ns().toString(), MODE_IS));
RecordData rd;
if (!_recordStore->findRecord(txn, loc, &rd))
return false;
*out = Snapshotted<BSONObj>(txn->recoveryUnit()->getSnapshotId(), rd.releaseToBson());
return true;
}
CollectionOptions MMAPV1DatabaseCatalogEntry::getCollectionOptions(OperationContext* txn,
RecordId rid) const {
CollectionOptions options;
if (rid.isNull()) {
return options;
}
RecordStoreV1Base* rs = _getNamespaceRecordStore();
invariant(rs);
RecordData data;
invariant(rs->findRecord(txn, rid, &data));
if (data.releaseToBson()["options"].isABSONObj()) {
Status status = options.parse(data.releaseToBson()["options"].Obj());
fassert(18523, status);
}
return options;
}
BSONObj KVCatalog::_findEntry(OperationContext* opCtx, StringData ns, RecordId* out) const {
RecordId dl;
{
stdx::lock_guard<stdx::mutex> lk(_identsLock);
NSToIdentMap::const_iterator it = _idents.find(ns.toString());
invariant(it != _idents.end(), str::stream() << "Did not find collection. Ns: " << ns);
dl = it->second.storedLoc;
}
LOG(3) << "looking up metadata for: " << ns << " @ " << dl;
RecordData data;
if (!_rs->findRecord(opCtx, dl, &data)) {
// since the in memory meta data isn't managed with mvcc
// its possible for different transactions to see slightly
// different things, which is ok via the locking above.
return BSONObj();
}
if (out)
*out = dl;
return data.releaseToBson().getOwned();
}