public class DataReader  {
 private static final ReentrantReadWriteLock readWriteLock = new ReentrantReadWriteLock();
 private static final Lock read = readWriteLock.readLock();
 private static final Lock write = readWriteLock.writeLock();
 public static void loadData() {
  try {
   write.lock();
   loadDataFromTheDB());
  } finally {
   write.unlock();
  }
 }
 
 public static boolean readData() {
  try {
   read.lock();
   readData();
  } finally {
   read.unlock();
  }
 }

 public static List loadDataFromTheDB() {
     List list = new ArrayList();
  return list;
 }

    public static void readData() throws DataServicesException {
     //Write reading logic
    }
}

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