@Override
	public void invalidateCache(boolean all) throws IOException {
		lock.acquire();
		try {
			valueMaps.clear();
		}
		finally {
			lock.release();
		}
	}
Constructs a new ProgramContextDB object
@param dbHandle the handle to the database.
@param errHandler the error handler
@param language the processor language
@param addrMap the address map.
@param lock the program synchronization lock
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/register/OldProgramContextDB.java