AbstractServices/interface/RootHandlers.h

0001 #ifndef FWCore_AbstractServices_interface_RootHandlers_h
0002 #define FWCore_AbstractServices_interface_RootHandlers_h
0003
0004 #include "FWCore/Utilities/interface/propagate_const.h"
0005 namespace edm {
0006   class EventProcessor;
0007   class RootHandlers {
0008   public:
0009     enum class SeverityLevel { kInfo, kWarning, kError, kSysError, kFatal };
0010
0011   private:
0012     struct WarningSentry {
0013       WarningSentry(RootHandlers* iHandler, SeverityLevel level) : m_handler(iHandler) {
0014         m_handler->ignoreWarnings_(level);
0015       };
0016       ~WarningSentry() { m_handler->enableWarnings_(); }
0017       edm::propagate_const<RootHandlers*> m_handler;
0018     };
0019     friend struct edm::RootHandlers::WarningSentry;
0020     friend class edm::EventProcessor;
0021
0022   public:
0023     RootHandlers() = default;
0024     RootHandlers(RootHandlers const&) = delete;
0025     RootHandlers& operator=(RootHandlers const&) = delete;
0026     RootHandlers(RootHandlers&&) = delete;
0027     RootHandlers& operator=(RootHandlers&&) = delete;
0028     virtual ~RootHandlers() = default;
0029
0030     template <typename F>
0031     void ignoreWarningsWhileDoing(F iFunc, SeverityLevel level = SeverityLevel::kWarning) {
0032       WarningSentry sentry(this, level);
0033       iFunc();
0034     }
0035
0036   private:
0037     virtual void willBeUsingThreads() = 0;
0038
0039     virtual void enableWarnings_() = 0;
0040     virtual void ignoreWarnings_(SeverityLevel level) = 0;
0041   };
0042 }  // end of namespace edm
0043
0044 #endif