code: public static boolean typeRegistryExistsForId(int typeRegistryId) {
  		for (TypeRegistry typeRegistry : loaderToRegistryMap.values()) {
  			if (typeRegistry != null && typeRegistry.getId() == typeRegistryId) {
  				return true;
  			}
  		}
  		return false;
  	}
docs: Check if a type registry exists for a specific type registry ID. Enables parts of the system (for example the
  FileSystemWatcher) to check if a type registry is still alive/active.
  
  @param typeRegistryId the ID of a type registry
  @return true if that type registry is still around, false otherwise