int DictionaryDatabase::lookupIDFromName(OperationContext &context,
const Name &name,
NameID &id, bool define)
{
int err = 0;
if (name == Name::dbxml_colon_name) {
id = nidName_;
} else if (name == Name::dbxml_colon_root) {
id = nidRoot_;
}
if (id == 0) {
MutexLock ml(mutex_);
u_int32_t flags = (getTxn(context) && !define) ? DB_READ_COMMITTED : 0;
name.setDbtFromThis_SecondaryKey(context.key());
if (stringCacheLookup(context, context.key(), id))
return 0;
err = secondary_->get(getTxn(context), &context.key(), &context.data(), flags);
if (err == 0) {
id.setThisFromDbt(context.data());
stringCache_.insert(&context.key(), id.raw());
} else if (err == DB_NOTFOUND && define) {
err = defineName(context, name, id); // define from name:uri
} else {
id.reset();
}
}
return err;
}
int DictionaryDatabase::lookupIDFromStringNameInternal(
OperationContext &context,
DbXmlDbt &dbt,
NameID &id,
bool define) const
{
if (!dbt.size) {
id.reset();
return 0;
}
u_int32_t flags = (getTxn(context) && !define) ? DB_READ_COMMITTED : 0;
if (stringCacheLookup(context, dbt, id))
return 0;
int err = secondary_->get(getTxn(context), &dbt,
&context.data(), flags);
if (err == 0) {
id.setThisFromDbt(context.data());
stringCache_.insert(&dbt, id.raw());
} else
id.reset();
return err;
}
// mutex is locked if present and necessary
int DictionaryDatabase::defineStringName(OperationContext &context,
const char *name, size_t namelen,
NameID &id)
{
// Primary { id -> name\0 }
// Secondary { name -> id }
int err = 0;
id.reset();
DbtIn primaryData((void*)name, namelen + 1); // add null
DbtIn secondaryKey((void*)name, namelen); // don't add null
err = primary_->appendPrimary(context, id,
primaryData, /*no flags*/0);
if (err == 0) {
/* Cache after insert. This prevents the cache from returning bad answers
* on a transaction abort, and speeds up access to newly inserted element
* and attribute names that are needed for indexing after an insert.
*/
cache_.insert(id.raw(), primaryData);
id.setDbtFromThis(context.key());
Transaction *txn = getTxn(context);
err = secondary_->put(txn, &secondaryKey,
&context.key(),
/*no flags*/0);
if (err == 0) {
/* Add to the transaction's string cache, that way if an abort occurs
* the values can be removed from the cache.
*/
if (txn) {
DictionaryStringCache *dsc = txn->getStringCache(this, true);
dsc->insert(&secondaryKey, id.raw());
}
if (Log::isLogEnabled(Log::C_DICTIONARY, Log::L_INFO)) {
ostringstream oss;
oss << "Define new name " << id << " -> " << name;
Log::log(environment_, Log::C_DICTIONARY, Log::L_INFO,
name_.c_str(),
oss.str().c_str());
}
}
}
return err;
}