void readThis() throws OldFormatException {
newSystemData(AbstractFreespaceManager.FM_LEGACY_RAM, StandardIdSystemFactory.LEGACY);
blockSizeReadFromFile(1);
_fileHeader = FileHeader.read(this);
if (config().generateCommitTimestamps().isUnspecified()) {
config().generateCommitTimestamps(_systemData.idToTimestampIndexId() != 0);
}
createStringIO(_systemData.stringEncoding());
createIdSystem();
initializeClassMetadataRepository();
initalizeWeakReferenceSupport();
setNextTimeStampId(systemData().lastTimeStampID());
classCollection().setID(_systemData.classCollectionID());
classCollection().read(systemTransaction());
Converter.convert(new ConversionStage.ClassCollectionAvailableStage(this));
_fileHeader.readIdentity(this);
if (_config.isReadOnly()) {
return;
}
if (!configImpl().commitRecoveryDisabled()) {
_fileHeader.completeInterruptedTransaction(this);
}
FreespaceManager blockedFreespaceManager =
AbstractFreespaceManager.createNew(this, _systemData.freespaceSystem());
installFreespaceManager(blockedFreespaceManager);
blockedFreespaceManager.read(this, _systemData.inMemoryFreespaceSlot());
blockedFreespaceManager.start(_systemData.bTreeFreespaceId());
_fileHeader = _fileHeader.convert(this);
if (freespaceMigrationRequired(blockedFreespaceManager)) {
migrateFreespace(blockedFreespaceManager);
}
writeHeader(true, false);
if (Converter.convert(new ConversionStage.SystemUpStage(this))) {
_systemData.converterVersion(Converter.VERSION);
_fileHeader.writeVariablePart(this);
transaction().commit();
}
}
private void migrateFreespace(FreespaceManager oldFreespaceManager) {
FreespaceManager newFreespaceManager =
AbstractFreespaceManager.createNew(this, configImpl().freespaceSystem());
newFreespaceManager.start(0);
systemData().freespaceSystem(configImpl().freespaceSystem());
installFreespaceManager(newFreespaceManager);
AbstractFreespaceManager.migrate(oldFreespaceManager, newFreespaceManager);
_fileHeader.writeVariablePart(this);
}