code: @SuppressWarnings("unchecked")
     public static <T> T lookup(Class<T> type)
     {
        if (instanceProviders == null) {
           instanceProviders = Iterators.asList(ServiceLoader.load(InstanceProvider.class));
           Collections.sort(instanceProviders, new WeightedComparator());
           ServiceLogger.logLoadedServices(log, InstanceProvider.class, instanceProviders);
        }
  
        T result = null;
        for (InstanceProvider p : instanceProviders) {
           result = (T) p.getInstance(type);
           if (result != null)
           {
              break;
           }
        }
        return result;
     }
docs: Lookup an instance of the given {@link Class} type.