@Override
	protected boolean refresh() {
		try {
			DBRecord rec = adapter.getRecord(key);
			if (rec != null) {
				settingsDef = null;
				record = rec;
				return super.refresh();
			}
		}
		catch (IOException e) {
			dataMgr.dbError(e);
		}
		return false;
	}
Construct TypeDefDB instance
@param dataMgr datatype manager
@param cache DataTypeDB cache
@param adapter TypeDef record adapter
@param record TypeDefDB record
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/TypedefDB.java