template<class TWorker>
class TFWLiteSelector< TWorker >
Description: A 'safe' form of a TSelector which uses a Worker helper class to do the processing
Usage: This is a safe form of a TSelector which separates the processing (which could happen on many computers when using PROOF) from the handling of the final result (which only happens on the original computer which is running the ROOT job).
The processing is handled by a worker class. This class is expected to have the following methods 1) a constructor which takes a 'const TList*' and a 'TList&' as its arguments. The 'const TList*' holds objects The 'TList&' is used to hold all the 'TObject' items (e.g. histograms) you want to access for the final result (e.g. the sum of all histograms created by the many Workers running on different computers). You should create the items in the constructor, hold onto them as member data in the Worker and 'Add' them to the TList. In addition, the 'TList&' can hold items sent to the workers from the TFWLiteSelector. 2) a method called 'process(const edm::Event&)' this is called for each Event 3) a destructor which does what ever you want to have done after all the Events have finished
You should inherit from TFWLiteSelector<...> where the template argument should be the worker you want to use. You need to implement the following methods 1) 'begin(const TList*& itemsForProcessing)' this is called before processing has started and before any workers get created. If you want to pass data to your workers, you can create a new TList and assign it to 'itemsForProcessing' and then add the objects you want passed into that list. NOTE: you are responsible for deleting the created TList and for deleting all items held by the TList. The easiest way to do this is to add a 'std::unique_ptr<TList>' member data to your Selector and then call 'SetOwner()' on the TList. 2) 'terminate(TList&)' this is called after all processing has finished. The TList& contains all the accumulated information from all the workers.
Definition at line 57 of file TFWLiteSelector.h.
Public Member Functions inherited from TFWLiteSelectorBasic
1.8.16