Athena Developer Guide

Athena Chapter 8 StoreGate - the event data access model Version/Issue: 2.0.0
8.5 Recording a DataObject
A DataObject may be recorded to the TransientStore using the StoreGateSvc. Each Algorithm has
access to the storeGateSvc() and can therefore invoke the record method. Once recorded, the TDS has
ownership of the DataObject. Hence clients must not call the delete of the DataObject.
All recorded DataObjects are organized according to their type. A key can be optionally associated to a
DataObject when this is recorded. At present it is the client responsibility to explicitly lock (set
constant) the DataObjects which should no longer be modified.
8.5.1 Recording DataObjects without keys
In the execute method of WriteData, create a DataObject of type MyDataObj, and set its member data:
Listing 8.4 Fragment 1 of WriteData Algorithm
MyDataObj* dobj = new MyDataObj();
dobj -> val(10);
Record it in the TDS as shown in Listing 8.5: (Note that the pointer to storeGateSvc() is available to
you if you are an “Algorithm”
Listing 8.5 Fragment 2 of WriteData Algorithm
StatusCode sc = storeGateSvc()->record(dobj);
if (sc.isFailure())
{
log