looper.Looper Class Reference

Inheritance diagram for looper.Looper:

Public Member Functions
def	__init__
def	loop
def	process
def	write

Public Attributes
	analyzers
	cfg_comp
	classes
	event
	events
	firstEvent
	iEvent
	logger
	name
	nEvents
	nPrint
	outDir
	setup
	start_time
	start_time_event
	timeReport

Private Member Functions
def	_build
def	_prepareOutput

Detailed Description

Creates a set of analyzers, and schedules the event processing.

Definition at line 47 of file looper.py.

Constructor & Destructor Documentation

def looper.Looper.__init__	(		self,
			name,
			config,
			nEvents = None,
			firstEvent = 0,
			nPrint = 0,
			timeReport = False,
			quiet = False
	)

Handles the processing of an event sample.
An Analyzer is built for each Config.Analyzer present
in sequence. The Looper can then be used to process an event,
or a collection of events.

Parameters:
name    : name of the Looper, will be used as the output directory name
config  : process configuration information, see Config
nEvents : number of events to process. Defaults to all.
firstEvent : first event to process. Defaults to the first one.
nPrint  : number of events to print at the beginning

Definition at line 56 of file looper.py.

                  quiet=False):
        """Handles the processing of an event sample.
        An Analyzer is built for each Config.Analyzer present
        in sequence. The Looper can then be used to process an event,
        or a collection of events.

        Parameters:
        name    : name of the Looper, will be used as the output directory name
        config  : process configuration information, see Config
        nEvents : number of events to process. Defaults to all.
        firstEvent : first event to process. Defaults to the first one.
        nPrint  : number of events to print at the beginning
        """

        self.name = self._prepareOutput(name)
        self.outDir = self.name
        self.logger = logging.getLogger( self.name )
        self.logger.addHandler(logging.FileHandler('/'.join([self.name,
                                                             'log.txt'])))
        self.logger.propagate = False
        if not quiet: 
            self.logger.addHandler( logging.StreamHandler(sys.stdout) )

        self.cfg_comp = config.components[0]
        self.classes = {}
        self.analyzers = map( self._build, config.sequence )
        self.nEvents = nEvents
        self.firstEvent = firstEvent
        self.nPrint = int(nPrint)
        self.timeReport = [ {'time':0.0,'events':0} for a in self.analyzers ] if timeReport else False
        tree_name = None
        if( hasattr(self.cfg_comp, 'tree_name') ):
            tree_name = self.cfg_comp.tree_name
        if len(self.cfg_comp.files)==0:
            errmsg = 'please provide at least an input file in the files attribute of this component\n' + str(self.cfg_comp)
            raise ValueError( errmsg )
        if hasattr(config,"preprocessor") and config.preprocessor is not None :
              self.cfg_comp = config.preprocessor.run(self.cfg_comp,self.outDir,firstEvent,nEvents)
        if hasattr(self.cfg_comp,"options"):
              print self.cfg_comp.files,self.cfg_comp.options
              self.events = config.events_class(self.cfg_comp.files, tree_name,options=self.cfg_comp.options)
        else :
              self.events = config.events_class(self.cfg_comp.files, tree_name)
        if hasattr(self.cfg_comp, 'fineSplit'):
            fineSplitIndex, fineSplitFactor = self.cfg_comp.fineSplit
            if fineSplitFactor > 1:
                if len(self.cfg_comp.files) != 1:
                    raise RuntimeError, "Any component with fineSplit > 1 is supposed to have just a single file, while %s has %s" % (self.cfg_comp.name, self.cfg_comp.files)
                totevents = min(len(self.events),int(nEvents)) if (nEvents and int(nEvents) not in [-1,0]) else len(self.events)
                self.nEvents = int(ceil(totevents/float(fineSplitFactor)))
                self.firstEvent = firstEvent + fineSplitIndex * self.nEvents
                if self.firstEvent + self.nEvents >= totevents:
                    self.nEvents = totevents - self.firstEvent 
                #print "For component %s will process %d events starting from the %d one, ending at %d excluded" % (self.cfg_comp.name, self.nEvents, self.firstEvent, self.nEvents + self.firstEvent)
        # self.event is set in self.process
        self.event = None
        services = dict()
        for cfg_serv in config.services:
            service = self._build(cfg_serv)
            services[cfg_serv.name] = service
        # would like to provide a copy of the config to the setup,
        # so that analyzers cannot modify the config of other analyzers. 
        # but cannot copy the autofill config.
        self.setup = Setup(config, services)