IncidentSvc.cpp

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#ifdef _WIN32
// ============================================================================
// Avoid conflicts between windows and the message service.
// ============================================================================
#define NOMSG
#define NOGDI
#endif
// ============================================================================
// Include Files
// ============================================================================
#include <functional>
#include "GaudiKernel/MsgStream.h"
#include "GaudiKernel/ISvcLocator.h"
#include "GaudiKernel/SmartIF.h"
#include "GaudiKernel/IIncidentListener.h"
#include "GaudiKernel/Incident.h"
#include "GaudiKernel/GaudiException.h"
#include "GaudiKernel/LockedChrono.h"
#include "GaudiKernel/AppReturnCode.h"
// ============================================================================
// Local
// ============================================================================
#include "IncidentSvc.h"
// ============================================================================
// Instantiation of a static factory class used by clients to create
//  instances of this service
DECLARE_COMPONENT(IncidentSvc)
// ============================================================================
namespace
{
  // ==========================================================================
  static const std::string s_unknown = "<unknown>" ;
  // Helper to get the name of the listener
  inline const std::string& getListenerName ( IIncidentListener* lis )
  {
    SmartIF<INamedInterface> iNamed(lis);
    return iNamed ? iNamed->name() : s_unknown ;
  }
  // ==========================================================================
}

#define ON_DEBUG if (UNLIKELY(outputLevel() <= MSG::DEBUG))
#define ON_VERBOSE if (UNLIKELY(outputLevel() <= MSG::VERBOSE))

#define DEBMSG ON_DEBUG debug()
#define VERMSG ON_VERBOSE verbose()

// ============================================================================
// Constructors and Destructors
// ============================================================================
IncidentSvc::IncidentSvc( const std::string& name, ISvcLocator* svc )
  : base_class(name, svc)
{}
// ============================================================================
IncidentSvc::~IncidentSvc()
{
  std::unique_lock<std::recursive_mutex> lock(m_listenerMapMutex);
}
// ============================================================================
// Inherited Service overrides:
// ============================================================================
StatusCode IncidentSvc::initialize()
{
  // initialize the Service Base class
  StatusCode sc = Service::initialize();
  if ( sc.isFailure() ) return sc;

  m_currentIncidentType = nullptr;

  // set my own (IncidentSvc) properties via the jobOptionService
  sc = setProperties();
  if ( UNLIKELY(sc.isFailure()) )
  {
    error() << "Could not set my properties" << endmsg;
    return sc;
  }
  return StatusCode::SUCCESS;
}
// ============================================================================
StatusCode IncidentSvc::finalize()
{
  DEBMSG << m_timer.outputUserTime( "Incident  timing: Mean(+-rms)/Min/Max:%3%(+-%4%)/%6%/%7%[ms] " , System::milliSec )
         << m_timer.outputUserTime ( "Total:%2%[s]" , System::Sec ) << endmsg ;

  // Finalize this specific service
  StatusCode sc = Service::finalize();
  if ( UNLIKELY(sc.isFailure()) ) { return sc; }

  return StatusCode::SUCCESS;
}
// ============================================================================
// Inherited IIncidentSvc overrides:
// ============================================================================
void IncidentSvc::addListener ( IIncidentListener* lis ,
                                const std::string& type ,
                                long prio, bool rethrow, bool singleShot)
{
  static const std::string all{ "ALL" };
  std::unique_lock<std::recursive_mutex> lock(m_listenerMapMutex);

  const std::string& ltype = ( !type.empty() ? type : all );

  // find if the type already exists
  auto itMap = m_listenerMap.find( ltype );
  if( itMap == m_listenerMap.end() ) {
    // if not found, create and insert now a list of listeners
    auto p = m_listenerMap.insert( { ltype, std::unique_ptr<ListenerList>( new ListenerList() )  } );
    if ( !p.second ) { /* OOPS */ }
    itMap = p.first;
  }
  auto& llist = *itMap->second;
  // add Listener ordered by priority -- higher priority first,
  // and then add behind listeneres with the same priority
  // -- so we skip over all items with higher or same priority
  auto i = std::partition_point( std::begin(llist),std::end(llist),
                                 [&](const Listener& j) { return j.priority >= prio; } );
  // We insert before the current position
  DEBMSG << "Adding [" << type << "] listener '" << getListenerName(lis)
         << "' with priority " << prio << endmsg;
  llist.emplace(i, lis, prio, rethrow, singleShot);
}
// ============================================================================
IncidentSvc::ListenerMap::iterator
IncidentSvc::removeListenerFromList(ListenerMap::iterator i,
                                    IIncidentListener* item,
                                    bool scheduleRemoval  )
{
    auto match = [&](ListenerList::const_reference j )
                 { return !item || item == j.iListener;  };

    auto& c = *(i->second);
    if (!scheduleRemoval) {
        ON_DEBUG std::for_each( std::begin(c), std::end(c),
                                [&](ListenerList::const_reference j) {
          if (match(j)) debug() << "Removing [" << i->first << "] listener '"
                               << getListenerName(j.iListener) << "'" << endmsg;
        });
        c.erase( std::remove_if( std::begin(c), std::end(c), match ),
                 std::end(c) );
    } else {
        std::for_each( std::begin(c), std::end(c), [&](Listener& i) {
            if (match(i)) i.singleShot = true; // will trigger removal as soon as it is safe
        });
    }
    return c.empty() ? m_listenerMap.erase(i) : std::next(i);
}
// ============================================================================
void IncidentSvc::removeListener( IIncidentListener* lis  ,
                                  const std::string& type )
{
  std::unique_lock<std::recursive_mutex> lock(m_listenerMapMutex);

  bool scheduleForRemoval = ( m_currentIncidentType
                              && type == *m_currentIncidentType );
  if( type.empty() ) {
    auto i =  std::begin(m_listenerMap);
    while ( i != std::end(m_listenerMap) ) {
      i = removeListenerFromList( i, lis, scheduleForRemoval );
    }
  } else {
    auto i = m_listenerMap.find( type );
    if ( i != m_listenerMap.end() ) removeListenerFromList( i, lis, scheduleForRemoval );
  }
}
// ============================================================================
namespace {
  constexpr struct isSingleShot_t {
    bool operator() (const IncidentSvc::Listener& l) const
    { return l.singleShot; }
  } isSingleShot {};
}
// ============================================================================
void IncidentSvc::i_fireIncident( const Incident&    incident     ,
                                  const std::string& listenerType )
{

  std::unique_lock<std::recursive_mutex> lock(m_listenerMapMutex);

  // Wouldn't it be better to write a small 'ReturnCode' service which
  // looks for these 'special' incidents and does whatever needs to
  // be done instead of making a special case here?

  // Special case: FailInputFile incident must set the application return code
  if ( incident.type() == IncidentType::FailInputFile ||
       incident.type() == IncidentType::CorruptedInputFile ) {
    auto appmgr = serviceLocator()->as<IProperty>();
    Gaudi::setAppReturnCode(appmgr,
                            incident.type() == IncidentType::FailInputFile ?
                                  Gaudi::ReturnCode::FailInput :
                                  Gaudi::ReturnCode::CorruptedInput
                           ).ignore();
  }

  auto ilisteners = m_listenerMap.find( listenerType );
  if ( m_listenerMap.end() == ilisteners ) return;

  // setting this pointer will avoid that a call to removeListener() during
  // the loop triggers a segfault
  m_currentIncidentType = &incident.type();

  bool firedSingleShot = false;

  auto& listeners = *ilisteners->second;

  for( auto& listener : listeners )
  {

    VERMSG << "Calling '" << getListenerName(listener.iListener)
           << "' for incident [" << incident.type() << "]" << endmsg;

    // handle exceptions if they occur
    try {
      listener.iListener->handle(incident);
    }
    catch( const GaudiException& exc ) {
      error() << "Exception with tag=" << exc.tag() << " is caught"
                 " handling incident" << m_currentIncidentType << endmsg;
      error() <<  exc  << endmsg;
      if ( listener.rethrow ) { throw exc; }
    }
    catch( const std::exception& exc ) {
     error() << "Standard std::exception is caught"
          " handling incident" << m_currentIncidentType << endmsg;
      error() << exc.what()  << endmsg;
      if ( listener.rethrow ) { throw exc; }
    }
    catch(...) {
      error() << "UNKNOWN Exception is caught"
          " handling incident" << m_currentIncidentType << endmsg;
      if ( listener.rethrow ) { throw; }
    }
    // check wheter one of the listeners is singleShot
    firedSingleShot |= listener.singleShot;
  }
  if (firedSingleShot) {
    // remove all the singleshot listeners that got there shot...
    listeners.erase( std::remove_if( std::begin(listeners),std::end(listeners), isSingleShot ),
                     std::end(listeners) ) ;
    if (listeners.empty()) m_listenerMap.erase(ilisteners);
  }

  m_currentIncidentType = nullptr;
}
// ============================================================================
void IncidentSvc::fireIncident( const Incident& incident )
{

  Gaudi::Utils::LockedChrono timer ( m_timer , m_timerLock ) ;

  // Call specific listeners
  i_fireIncident(incident, incident.type());
  // Try listeners registered for ALL incidents
  if ( incident.type() != "ALL" ){ // avoid double calls if somebody fires the incident "ALL"
    i_fireIncident(incident, "ALL");
  }
}

// ============================================================================
void
IncidentSvc::getListeners(std::vector<IIncidentListener*>& l,
                          const std::string& type) const
{
  static const std::string ALL { "ALL" };
  std::unique_lock<std::recursive_mutex> lock(m_listenerMapMutex);

  const std::string&  ltype = ( !type.empty() ? type : ALL );

  l.clear();
  auto i = m_listenerMap.find( ltype );
  if (i != m_listenerMap.end()) {
      l.reserve(i->second->size());
      std::transform( std::begin(*i->second), std::end(*i->second),
                      std::back_inserter(l),
                      std::mem_fn(&Listener::iListener) );
  }
}

// ============================================================================
// The END
// ============================================================================