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User modules in psana are the instances of the C++ class which must inherit from a special base class psana::Module
. There are several methods in the base class which can be overriden in the subclass (event() must always be implemented):
void beginJob(Event& evt, Env& env)
void beginRun(Event& evt, Env& env)
void beginCalibCycle(Event& evt, Env& env)
void event(Event& evt, Env& env)
void endCalibCycle(Event& evt, Env& env)
void endRun(Event& evt, Env& env)
void endJob(Event& evt, Env& env)
To start with the doing analysis one should have user release setup first as explained in Packages and Releases. If you have not done it yet create a package for your analysis with some unique name:
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#ifndef MY_ANA_PKG_MY_ANA_MOD_H
#define MY_ANA_PKG_MY_ANA_MOD_H
#include "psana/Module.h"
namespace my_ana_pkg {
class my_ana_mod : public Module {
public:
my_ana_mod (const std::string& name) ;
virtual ~my_ana_mod () ;
virtual void event(Event& evt, Env& env);
virtual void endJob(Event& evt, Env& env);
private:
double m_threshold;
unsigned long m_count;
unsigned long m_total;
};
}
#endif // MY_ANA_PKG_MY_ANA_MOD_H
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#include "my_ana_pkg/my_ana_mod.h"
#include "MsgLogger/MsgLogger.h"
#include "psddl_psana/bld.ddl.h"
// This declares this class as psana module
using namespace my_ana_pkg;
PSANA_MODULE_FACTORY(my_ana_mod)
namespace my_ana_pkg {
my_ana_mod::my_ana_mod (const std::string& name)
: Module(name)
, m_threshold(0.0)
, m_count(0)
, m_total(0)
{
m_threshold = config("threshold");
}
my_ana_mod::~my_ana_mod ()
{
}
void
my_ana_mod::event(Event& evt, Env& env)
{
// get beam data
boost::shared_ptr<Psana::Bld::BldDataEBeam> ebeam = evt.get(Source());
if (ebeam.get()) {
if (ebeam->ebeamL3Energy() > m_threshold) {
++ m_count;
}
++ m_total;
}
}
void
my_ana_mod::endJob(Event& evt, Env& env)
{
MsgLog(name(), info, "Fraction of events with energy>" << m_threshold
<< " is " << m_count*100.0/m_total << "%");
}
}
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