#include <NSCLDAQFactorySelector.h>
namespace FormatSelector {
enum SupportedVersions {v10, v11, v12};
RingItemFactoryBase& selectFactory(SupportedVersions version);
RingItemFactoryBase& selectFactory(CDataFormatItem& item);
}
The definitions in the FormatSelector namespace provide mechnisms to select specific format factory either from an explicit format specifier or from a data format item. Note that data format items appear in NSCLDAQ-11 and later.
The format factories instantiated by these functions are cached for later lookup. This implies that:
Ownership of the factories continues to reside with this module. Deleting a factory returned from this API will result in undefined, possibly fatal, behavior.
Several attempts to get a factory reference for the same format version will return references to the same factory instance.
The FormatSelector::SupportedVersions enum is a type that is used as an NSCLDAQ version selector.
Note that while all functions live in the FormatSelector namespace this is not shown in the function list below for the sake of brevity.
::RingItemFactoryBase& selectFactory(SupportedVersions version);
Returns a reference to a ring item factory that is
suitable for creatig ring items for the NSCLDAQ
version selected by version.
The factory continues to be owned by the selection
subsystem and must not be deleted
by the caller.
A cache of factories ensures that several attempts to obtain a factory for the same version will return references to the same factory.
::RingItemFactoryBase& selectFactory(CDataFormatItem& item);
Given a reference to a data format item from any
version of NSCLDAQ that can produce these, provides
a factory for the version of NSCLDAQ indicated by that
item. This wraps the prior overload for
selectFactory so everything
described above about the returned reference holds for
this one.
If a version is selected which is somehow not supported,
std::invalid_argument is thrown by
the selectFactoryMethods above.