bool DoLookupTransaction(const char *db_name,
const char *key_name,
Buffer *buf)
{
// lookups can occur even as some backends are being finished
// (i.e. the block backend). allow this behavior, which must come
// before the Xdb backend itself is finished.
if (TransactionBackend::HasFinishedBackends()) {
Assert(!IsAnalysisRemote());
Xdb *xdb = GetDatabase(db_name, false);
if (!xdb || !xdb->Exists())
return false;
String *key = String::Make(key_name);
return XdbFindUncompressed(xdb, key, buf);
}
Transaction *t = new Transaction();
size_t data_res = t->MakeVariable(true);
TOperand *key_arg = new TOperandString(t, key_name);
t->PushAction(Backend::XdbLookup(t, db_name, key_arg, data_res));
SubmitTransaction(t);
TOperandString *data_value = t->LookupString(data_res);
if (data_value->GetDataLength() == 0) {
delete t;
return false;
}
else {
TOperandString::Uncompress(data_value, buf);
delete t;
return true;
}
}
