CommonDataMaker


Purpose

Create an CommonData object and store it to the TES.
CommonData is a place that provides data and functionality shared by two or more Makers.


CommonDataMaker Overiew

There a number of parameters and functionality that needs to be available to different makers. These include

CommonData provides methods to retreive simple data such as the luminosity flag.

The invisible particles are not distributed as a list: rather, selector objects
embodying the beviour which is in common to the makers is provided.
InvisibleToCal returns a function object which returns a boolean indicating if a HepMC particle is visible to the calorimeter.
This is set to reject e, mu and tau neutrinos, any user requested invisible, and muons.
This selector is used by CellMaker and Isolator in the current design.

InvisibleToATLAS returns a function object which returns a boolean indicating if a HepMC particle is visible to the ATLAS - this is set to reject e, mu and tau neutrinos, any user requested invisible, and muons out of the acceptance.
This selector is used by EventHeaderMaker in the escaped momentum calculation.

The two selectors (which can be used by more than one maker) thus share the same information
about particles which the user has declared to be invisible.

In the present design, CommonDataMaker makes a CommonData object at Initialise, and stores it in the TES once per event.
The makers retrieve the CommonData object in their Execute method, and set there selectors to it.
This less than perfect solution (these activities should be done once, at initialise) is due to current limitations of the framework or understanding of the framework.

User Requirements Satisfied

The design fulfills requirements 3.1.6 of the ARD.


CommonDataMaker Detail

jobOptions Properties

jobOptions properties are steering parameters which can be set by the user in the jobOptions file.
They are declared in the constructor and initialised to Default Values
The options for this algorithm are


Initialisation

The initialise method is called once at the beginning of the job.
The CommonData object is created.


Execution

CommonData is written to the TES.

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