/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/FWCore/Framework/src/WorkerInPath.h

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#ifndef FWCore_Framework_WorkerInPath_h
#define FWCore_Framework_WorkerInPath_h

/*

        Author: Jim Kowalkowski 28-01-06

        $Id: WorkerInPath.h,v 1.14 2010/10/30 01:34:01 chrjones Exp $

        A wrapper around a Worker, so that statistics can be managed
        per path.  A Path holds Workers as these things.

*/

#include "FWCore/Framework/src/Worker.h"
#include "FWCore/Framework/src/RunStopwatch.h"

namespace edm {

  class WorkerInPath {
  public:
    enum FilterAction { Normal=0, Ignore, Veto };

    explicit WorkerInPath(Worker*);
    WorkerInPath(Worker*, FilterAction theAction);

    template <typename T>
    bool runWorker(typename T::MyPrincipal&, EventSetup const&,
                   CurrentProcessingContext const* cpc);

    std::pair<double,double> timeCpuReal() const {
      if(stopwatch_) {
        return std::pair<double,double>(stopwatch_->cpuTime(),stopwatch_->realTime());
      }
      return std::pair<double,double>(0.,0.);
    }

    void clearCounters() {
      timesVisited_ = timesPassed_ = timesFailed_ = timesExcept_ = 0;
    }
    void useStopwatch();
    
    int timesVisited() const { return timesVisited_; }
    int timesPassed() const { return timesPassed_; }
    int timesFailed() const { return timesFailed_; }
    int timesExcept() const { return timesExcept_; }

    FilterAction filterAction() const { return filterAction_; }
    Worker* getWorker() const { return worker_; }

  private:
    RunStopwatch::StopwatchPointer stopwatch_;

    int timesVisited_;
    int timesPassed_;
    int timesFailed_;
    int timesExcept_;
    
    FilterAction filterAction_;
    Worker* worker_;
  };

  template <typename T>
  bool WorkerInPath::runWorker(typename T::MyPrincipal & ep, EventSetup const & es,
                               CurrentProcessingContext const* cpc) {

    if (T::isEvent_) {
      ++timesVisited_;
    }
    bool rc = true;

    try {
        // may want to change the return value from the worker to be 
        // the Worker::FilterAction so conditions in the path will be easier to 
        // identify
        rc = worker_->doWork<T>(ep, es, cpc,stopwatch_.get());

        // Ignore return code for non-event (e.g. run, lumi) calls
        if (!T::isEvent_) rc = true;
        else if (filterAction_ == Veto) rc = !rc;
        else if (filterAction_ == Ignore) rc = true;

        if (T::isEvent_) {
          if(rc) ++timesPassed_; else ++timesFailed_;
        }
    }
    catch(...) {
        if (T::isEvent_) ++timesExcept_;
        throw;
    }

    return rc;
  }

}

#endif