/*
* Load a database and adapt to the description if needed
*/
CDatabase* CDbManager::loadDatabase(TDatabaseId id, const string& description, CLog* log)
{
CHECK_DB_MGR_INIT(loadDatabase, false);
nlinfo("CDbManager::loadDatabase(): load/setup database '%d'", id);
CDatabase* db = getDatabase(id);
// database not loaded yet?
if (db == NULL)
{
// create a memory image
db = createDatabase(id, log);
if (db == NULL)
{
log->displayNL("failed to create database '%d'", id);
return NULL;
}
// if can't load database
if (!db->loadState())
{
nlinfo("CDbManager::loadDatabase(): database '%d' doesn't exist, create new", id);
// create a new database with the new description
if (!db->createFromScratch(description))
{
log->displayNL("failed to create database '%d' from scratch", id);
return NULL;
}
return db;
}
}
CDatabase* adapted = db->adapt(description);
if (adapted == NULL)
{
log->displayNL("failed to adapt database '%s' to new description", db->getName().c_str());
return NULL;
}
// database changed?
if (db != adapted)
{
// replace old on with new one
_DatabaseMap[id] = adapted;
// and delete old
delete db;
}
return adapted;
}
/*
* Adapt database to new description
* \param description is the latest xml description of the database
* \returns true is adaptation succeded
*/
CDatabase* CDatabase::adapt(const string& description)
{
PDS_DEBUG("adapt()");
if (!initialised())
{
PDS_WARNING("adapt(): failed, database not initialised");
return NULL;
}
// get 'From' HashKey
CHashKey hash1 = _Description.getHashKey();
// get 'Into' HashKey
CHashKey hash2 = getSHA1((const uint8*)(description.c_str()), (uint32)description.size());
// same hash, ok go on
if (hash1 == hash2)
return this;
// build a clean reference if needed
if (!isReferenceUpToDate())
{
if (!buildReference())
{
PDS_WARNING("adapt(): failed to buildReference()");
return false;
}
}
// backup old reference
if (!_Reference.save(_Reference.getPath()+"ref"))
{
PDS_WARNING("adapt(): failed to backup reference index");
}
// create a new destination database
CDatabase* into = new CDatabase(_State.Id);
if (!into->createFromScratch(description))
{
PDS_WARNING("adapt(): failed to create new reference");
delete into;
return NULL;
}
CDatabaseAdapter adapter;
if (!adapter.build(this, into))
{
PDS_WARNING("adapt(): failed to build() adapter");
delete into;
return NULL;
}
if (!adapter.buildContent())
{
PDS_WARNING("adapt(): adapter failed to buildContent()");
delete into;
return NULL;
}
// rebuild volatile data
// that is all non persistant data that can be found from persistant data
if (!into->rebuildVolatileData())
{
PDS_WARNING("adapt(): failed to rebuildVolatileData()");
delete into;
return NULL;
}
// init timestamps as database is ready to run
into->initTimestamps();
return into;
}
