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Here is the minimal example of the module class declaration with only the event() method implemented and many non-essential details are skipped:
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#include "psana/Module.h"
namespace Package {
class ExampleModule: public Module {
public:
// Constructor takes module name as a parameter
ExampleModule(const std::string& name);
// Implementation of event() from base class
virtual void event(Event& evt, Env& env);
};
} // namespace Package
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Definition of the factory function and methods:
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#include "Package/ExampleModule.h"
#include "MsgLogger/MsgLogger.h"
#include "PSEvt/EventId.h"
// define factory function
using namespace Package;
PSANA_MODULE_FACTORY(ExampleModule)
// Constructor
ExampleModule::ExampleModule(const std::string& name)
: Module(name)
{
}
void
ExampleModule::event(Event& evt, Env& env)
{
// get event ID
shared_ptr<EventId> eventId = evt.get();
if (not eventId.get()) {
MsgLog(name(), info, "event ID not found");
} else {
MsgLog(name(), info, "event ID: " << *eventId);
}
}
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A set of psana modules is available in current release as explained in Psana Module Catalog - Old. Part of them demonstrates how data can be accessed from user module code . Other modules can be used in data analysis or event filtering. Example of application for these modules are available in separate document:
- Psana Module Examples - Old - for advanced modules for analysis and event filtering
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