ITimelineSvc.h

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/***********************************************************************************\
* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#ifndef GAUDIKERNEL_ITIMELINESVC_H
#define GAUDIKERNEL_ITIMELINESVC_H

#include "GaudiKernel/IService.h"

#include <pthread.h>
#include <string>

#include <chrono>

class EventContext;

struct TimelineEvent final {
  using Clock      = std::chrono::high_resolution_clock;
  using time_point = Clock::time_point;

  pthread_t thread;
  size_t    slot;
  size_t    event;

  std::string algorithm;

  time_point start;
  time_point end;
};

class GAUDI_API ITimelineSvc : virtual public IService {

public:
  DeclareInterfaceID( ITimelineSvc, 2, 0 );

  class TimelineRecorder final {
  public:
    using Clock = TimelineEvent::Clock;

    TimelineRecorder() = default;
    TimelineRecorder( TimelineEvent& record, std::string alg, const EventContext& ctx );

    TimelineRecorder( const TimelineRecorder& ) = delete;
    TimelineRecorder( TimelineRecorder&& other ) : m_record{other.m_record} { other.m_record = nullptr; }

    TimelineRecorder& operator=( TimelineRecorder&& other ) {
      std::swap( m_record, other.m_record );
      return *this;
    }

    ~TimelineRecorder() {
      if ( m_record ) m_record->end = Clock::now();
    }

  private:
    TimelineEvent* m_record = nullptr;
  };

  virtual TimelineRecorder getRecorder( std::string alg, const EventContext& ctx ) = 0;
  // Augment a partially pre-filled TimelineEvent object with matching info
  virtual bool getTimelineEvent( TimelineEvent& ) const = 0;
  virtual bool isEnabled() const                        = 0;
};

#endif