IncidentSvc Class Reference

#include <IncidentSvc.h>

Inheritance diagram for IncidentSvc:

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Collaboration diagram for IncidentSvc:

[legend]

List of all members.

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Detailed Description

Default implementation of the IIncidentSvc interface.

This implementation is thread-safe with the following features:

• Calls to fireIncident(), addListener() and removeListener() are synchronized across threads.
• Calls to IIncidentListener::handle() are serialized, i.e. at any time there is at most one incident handler being executed across all threads.

Definition at line 28 of file IncidentSvc.h.

Public Types
typedef std::list< Listener >	ListenerList
typedef std::map< std::string, ListenerList * >	ListenerMap
Public Member Functions
virtual StatusCode	initialize ()
virtual StatusCode	finalize ()
virtual void	addListener (IIncidentListener *lis, const std::string &type="", long priority=0, bool rethrow=false, bool singleShot=false)
	Add listener.
virtual void	removeListener (IIncidentListener *lis, const std::string &type="")
	Remove listener.
virtual void	fireIncident (const Incident &incident)
	Fire an Incident.
	IncidentSvc (const std::string &name, ISvcLocator *svc)
virtual	~IncidentSvc ()
Private Member Functions
void	i_fireIncident (const Incident &incident, const std::string &type)
	Internal function to allow incidents listening to all events.
Private Attributes
ListenerMap	m_listenerMap
	List of auditor names.
const std::string *	m_currentIncidentType
	Incident being fired.
MsgStream	m_log
	Internal MsgStream.
boost::recursive_mutex	m_listenerMapMutex
	Mutex to synchronize access to m_listenerMap.
Classes
struct	Listener

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Member Typedef Documentation

typedef std::list<Listener> IncidentSvc::ListenerList

Definition at line 44 of file IncidentSvc.h.

typedef std::map<std::string, ListenerList*> IncidentSvc::ListenerMap

Definition at line 45 of file IncidentSvc.h.

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Constructor & Destructor Documentation

IncidentSvc::IncidentSvc	(	const std::string &	name,
		ISvcLocator *	svc
	)

Definition at line 36 of file IncidentSvc.cpp.

  : base_class(name, svc),
    m_currentIncidentType(0),
    m_log(msgSvc(), name)
{
}

IncidentSvc::~IncidentSvc

(

)

[virtual]

Definition at line 43 of file IncidentSvc.cpp.

                          {
  boost::recursive_mutex::scoped_lock lock(m_listenerMapMutex);

  for (ListenerMap::iterator i = m_listenerMap.begin();
       i != m_listenerMap.end();
       ++i) {
    delete i->second;
  }
}

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Member Function Documentation

StatusCode IncidentSvc::initialize

(

)

[virtual]

Reimplemented from Service.

Definition at line 57 of file IncidentSvc.cpp.

                                   {
  // initialize the Service Base class
  StatusCode sc = Service::initialize();
  if ( sc.isFailure() ) {
    return sc;
  }

  m_log.setLevel(outputLevel());
  m_currentIncidentType = 0;

  // set my own (IncidentSvc) properties via the jobOptionService
  sc = setProperties();
  if ( sc.isFailure() ) {
    m_log << MSG::ERROR << "Could not set my properties" << endmsg;
    return sc;
  }

  return StatusCode::SUCCESS;
}

StatusCode IncidentSvc::finalize

(

void

)

[virtual]

Reimplemented from Service.

Definition at line 77 of file IncidentSvc.cpp.

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

  return StatusCode::SUCCESS;
}

void IncidentSvc::addListener	(	IIncidentListener *	lis,
		const std::string &	type = "",
		long	priority = 0,
		bool	rethrow = false,
		bool	singleShot = false
	)			[virtual]

Add listener.

Parameters:

	lis	Listener address
	type	Incident type
	priority	Priority in handling incident

Implements IIncidentSvc.

Definition at line 91 of file IncidentSvc.cpp.

                                                                        {

  boost::recursive_mutex::scoped_lock lock(m_listenerMapMutex);

  std::string ltype;
  if( type == "" ) ltype = "ALL";
  else             ltype = type;
  // find if the type already exists
  ListenerMap::iterator itMap = m_listenerMap.find( ltype );
  if( itMap == m_listenerMap.end() ) {
    // if not found, create and insert now a list of listeners
    ListenerList* newlist = new ListenerList();
    std::pair<ListenerMap::iterator, bool> p;
    p = m_listenerMap.insert(ListenerMap::value_type(ltype, newlist));
    if( p.second ) itMap = p.first;
  }
  ListenerList* llist = (*itMap).second;
  // add Listener in the ListenerList according to the priority
  ListenerList::iterator itlist;
  for( itlist = llist->begin(); itlist != llist->end(); itlist++ ) {
    if( (*itlist).priority < prio ) {
      // We insert before the current position
      break;
    }
  }

  m_log << MSG::DEBUG << "Adding [" << type << "] listener '" << getListenerName(lis)
        << "' with priority " << prio << endmsg;

  llist->insert(itlist, Listener(lis, prio, rethrow, singleShot));
}

void IncidentSvc::removeListener	(	IIncidentListener *	lis,
		const std::string &	type = ""
	)			[virtual]

Remove listener.

Parameters:

	lis	Listener address
	type	Incident type

Implements IIncidentSvc.

Definition at line 124 of file IncidentSvc.cpp.

                                                                              {

  boost::recursive_mutex::scoped_lock lock(m_listenerMapMutex);

  if( type == "") {
    // remove Listener from all the lists
    ListenerMap::iterator itmap;
    for ( itmap = m_listenerMap.begin(); itmap != m_listenerMap.end();) {
      // since the current entry may be eventually deleted
      // we need to keep a memory of the next index before calling recursively this method
      ListenerMap::iterator itmap_old = itmap;
      itmap++;
      removeListener( lis, (*itmap_old).first );
    }
  }
  else {
    ListenerMap::iterator itmap = m_listenerMap.find( type );

    if( itmap == m_listenerMap.end() ) {
      // if not found the incident type then return
      return;
    }
    else {
      ListenerList* llist = (*itmap).second;
      ListenerList::iterator itlist;
      bool justScheduleForRemoval = ( 0!= m_currentIncidentType )
                                    && (type == *m_currentIncidentType);
      // loop over all the entries in the Listener list to remove all of them than matches
      // the listener address. Remember the next index before erasing the current one
      for( itlist = llist->begin(); itlist != llist->end(); ) {
        if( (*itlist).iListener == lis || lis == 0) {
          if (justScheduleForRemoval) {
            (itlist++)->singleShot = true; // remove it as soon as it is safe
          }
          else {
            m_log << MSG::DEBUG << "Removing [" << type << "] listener '"
                << getListenerName(lis) << "'" << endmsg;
            itlist = llist->erase(itlist); // remove from the list now
          }
        }
        else {
          itlist++;
        }
      }
      if( llist->size() == 0) {
        delete llist;
        m_listenerMap.erase(itmap);
      }
    }
  }
}

void IncidentSvc::fireIncident

(

const Incident &

incident

)

[virtual]

Fire an Incident.

Parameters:

Incident

being fired

Implements IIncidentSvc.

Definition at line 242 of file IncidentSvc.cpp.

                                                         {

  // 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::i_fireIncident	(	const Incident &	incident,
		const std::string &	type
	)			[private]

Internal function to allow incidents listening to all events.

Definition at line 186 of file IncidentSvc.cpp.

                                                                                          {

  boost::recursive_mutex::scoped_lock lock(m_listenerMapMutex);

  ListenerMap::iterator itmap = m_listenerMap.find( listenerType );
  if ( m_listenerMap.end() == itmap ) return;

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

  ListenerList* llist = (*itmap).second;
  ListenerList::iterator itlist;
  bool weHaveToCleanUp = false;
  // loop over all registered Listeners
  for( itlist = llist->begin(); itlist != llist->end(); itlist++ ) {
    m_log << MSG::VERBOSE << "Calling '" << getListenerName((*itlist).iListener)
          << "' for incident [" << incident.type() << "]" << endmsg;

    // handle exceptions if they occur
    try {
      (*itlist).iListener->handle(incident);
    }
    catch( const GaudiException& exc ) {
      m_log << MSG::ERROR << "Exception with tag=" << exc.tag() << " is caught"
          " handling incident" << m_currentIncidentType << endmsg;
      m_log << MSG::ERROR <<  exc  << endmsg;
      if ( (*itlist).rethrow ) { throw (exc); }
    }
    catch( const std::exception& exc ) {
      m_log << MSG::ERROR << "Standard std::exception is caught"
          " handling incident" << m_currentIncidentType << endmsg;
      m_log << MSG::ERROR << exc.what()  << endmsg;
      if ( (*itlist).rethrow ) { throw (exc); }
    }
    catch(...) {
      m_log << MSG::ERROR << "UNKNOWN Exception is caught"
          " handling incident" << m_currentIncidentType << endmsg;
      if ( (*itlist).rethrow ) { throw; }
    }
    // check if at least one of the listeners is a one-shot
    weHaveToCleanUp |= itlist->singleShot;
  }
  if (weHaveToCleanUp) {
    // remove all the listeners that need to be removed from the list
    llist->remove_if( listenerToBeRemoved() );
    // if the list is empty, we can remove it
    if( llist->size() == 0) {
      delete llist;
      m_listenerMap.erase(itmap);
    }
  }

  m_currentIncidentType = 0;
}

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Member Data Documentation

ListenerMap IncidentSvc::m_listenerMap [private]

List of auditor names.

Definition at line 70 of file IncidentSvc.h.

const std::string* IncidentSvc::m_currentIncidentType [private]

Incident being fired.

It is used to know if we can safely remove a listener or we have to schedule its removal for later.

Definition at line 74 of file IncidentSvc.h.

MsgStream IncidentSvc::m_log [private]

Internal MsgStream.

Definition at line 77 of file IncidentSvc.h.

boost::recursive_mutex IncidentSvc::m_listenerMapMutex [private]

Mutex to synchronize access to m_listenerMap.

Definition at line 80 of file IncidentSvc.h.

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The documentation for this class was generated from the following files:

• /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v21r6/GaudiSvc/src/IncidentSvc/IncidentSvc.h
• /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v21r6/GaudiSvc/src/IncidentSvc/IncidentSvc.cpp