DataHandles

bundle for DataHandle and DataObjectHandle

Major components: DataObjID : data object identification

DataHandle -> DataObjectHandleBase -> DataObjectHandle DataHandle: base class shared between ATLAS and Gaudi DataObjectHandleBase: base class for Handles in Gaudi, used for property manipulation and basic functionality DataObjectHandle: user class for handles, templated in type of object in store.

handles are declared in header file:

DataObjectHandle m_trackHnd;

initialized in constructor of parent Algorithm / AlgTool:

m_trackHnd("/Event/Rec/Tracks", Gaudi::DataHandle::Reader, this),

declared as Property in constructor of parent Algorithm / AlgTool:

declareProperty("tracks", m_trackHnd, "the tracks");

after this, all dependency propagation is automatic.

DataObjectHandles have the following attributes that can be set at runtime via the jobOptions: Path : string path to location in EDS, eg "/Event/RAW/tracks" Mode : int matching Gaudi::DataHandle::Mode (should probably allow string too) Optional: bool, whether the object is optional AlternativePaths: string array of alternative paths in EDS

in order to maintain uniform syntax for all handle types, the "private only" constructor for ToolHandles has been reverted. Thus:

in header:

ToolHandle m_myPrivToolHandle; ToolHandle m_myPubToolHandle;

in Algorithm constructor:

m_myPrivToolHandle("MyTool/PrivToolHandle",this), m_myPubToolHandle("MyTool/PubToolHandle"),

declareProperty("PrivToolHandle", m_myPrivToolHandle, "the private tool"); declareProperty("PubToolHandle", m_myPubToolHandle, "the public tool");

no need for separate call for declareXXXTool

Also includes updates to GaudiHive for support of DataObjID

tests and examples have been updated for new DataHandle usage