@Override
	protected boolean refresh() {
		try {
			DBRecord rec = fragmentAdapter.getFragmentRecord(key);
			if (rec != null) {
				record = rec;
				addrSet = moduleMgr.getFragmentAddressSet(key);
				return true;
			}
		}
		catch (IOException e) {
			moduleMgr.dbError(e);

		}
		return false;
	}
Constructor
@param moduleMgr module manager
@param cache fragment DB cache
@param record fragment record
@param addrSet fragment address set
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/module/FragmentDB.java