@Override
 public void populateDatabase(int blockCount) {
   shutdownDbServer();
   fetcherService.writeBlockchainToJSON(blockCount);
   parseService.writeJSONToDB();
   startDbServer();
 }
 @Override
 public void updateDatabase() {
   shutdownDbServer();
   fetcherService.writeBlockchainToJSON();
   parseService.writeJSONToDB();
   startDbServer();
 }