public <T> DrawableTypeRequest<T> from(Class<T> modelClass) {
        return loadGeneric(modelClass);
    }
Returns a request builder that can be used for multiple loads that uses the
{@link com.bumptech.glide.load.model.ModelLoaderFactory}s registered for the given model class for
{@link InputStream}s and {@link ParcelFileDescriptor}s to load a thumbnail from objects of
the given modelClass.

<p>
    Note - you must use {@link DrawableRequestBuilder#load(Object)}} to set a concrete model
    to be loaded before calling
    {@link DrawableRequestBuilder#into(com.bumptech.glide.request.target.Target)}. You may
    also use this object for repeated loads by calling <code>request.load(model).into(target)</code>. You may
    also adjust the options after calling {@link DrawableRequestBuilder#load(Object)}} and/or
    {@link DrawableRequestBuilder#into(com.bumptech.glide.request.target.Target)}}. However,
    keep in mind that any changes in options will apply to all future loads.
</p>

@param modelClass The class of model requests built by this class will load data from.
@param <T> The type of the model.
core/src/main/java/com/bumptech/glide/RequestManager.java