| BaseBitmapDataSubscriber | Implementation of DataSubscriber for cases where the client wants access to a bitmap. |
| BaseListBitmapDataSubscriber | Implementation of DataSubscriber for cases where the client wants to access
a list of bitmaps. |
| ListDataSource<T> | Data source that wraps number of other data sources and waits until all of them are finished. |
| SettableDataSource<T> | A DataSource whose result may be set by a #set(CloseableReferencesetException(Throwable) call. |