- Type Parameters:
FROM- Data type this transformer receives
TO- Type of transformed data
public interface DataTransformer<FROM,TO>Transforms or processes data before it is given to subscribed
DataObservers. A transformer is set via
Note that a transformer is not required to actually "transform" any data. Technically, it's fine to return the same data it received and just do some processing with it.
Threading notes: transformations are executed sequentially on a background thread owned by the subscription publisher. It is OK to perform long lasting operations, however this will block notifications to all other observers until finished.
transformTransforms/processes the given data.
source- data to be transformed
- transformed data
java.lang.Exception- Transformers may throw any exceptions, which can be reacted on via