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EventGeneratorBase.h

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00001 //-*-c++-*-
00002 #ifndef INCLUDED_EventGeneratorBase_h_
00003 #define INCLUDED_EventGeneratorBase_h_
00004 
00005 #include "Behaviors/BehaviorBase.h"
00006 
00007 //! A simple convenience class for event generators
00008 /*! Note that you don't need to inherit from this class to be able to
00009  *  send events!  Any code can send any event any time, just by calling 
00010  *  one of the EventRouter::postEvent() functions.
00011  *  
00012  *  Uses a BehaviorBase base class so that you can start and stop it.
00013  *
00014  *  Allows variable settings of the generator id and source id for
00015  *  outgoing events as well as automatic handling of
00016  *  listening/unlistening for a single optional event source.  If you
00017  *  want something more fancy that that though, you'll have to
00018  *  override DoStart/DoStop yourself. (or extend/modify this class...)
00019  *
00020  */
00021 class EventGeneratorBase : public BehaviorBase {
00022 public:
00023   // Constructors are all protected - doesn't make sense to
00024   // instantiate this class directly, you want to use a subclass
00025 
00026   //! destructor - does nothing
00027   virtual ~EventGeneratorBase() {}
00028   
00029   virtual void DoStart();
00030   
00031   virtual void DoStop();
00032   
00033   //! if autolistening, will receive EventRouter events concerning our own listeners
00034   /*! This will automatically reduce overhead by eliminating chains of events thrown
00035    *  that don't have any end listeners.  However, this might mean your subclass's
00036    *  processEvent will be receiving the events from erouterEGID, and will need
00037    *  to call EventGeneratorBase::processEvent() in order to allow them to be used */
00038   virtual void processEvent(const EventBase& event);
00039   
00040   //! return the generator ID that will be broadcast from
00041   virtual EventBase::EventGeneratorID_t getGeneratorID() { return myGenID; }
00042   //! set the generator ID that will be broadcast from (typically it's a bad idea to call this...)
00043   virtual void setGeneratorID(EventBase::EventGeneratorID_t gid) { myGenID=gid; }
00044 
00045   //! return the source ID that will be broadcast on
00046   virtual unsigned int getSourceID() { return mySourceID; }
00047   //! set the source ID that will be broadcast on
00048   virtual void setSourceID(unsigned int sid) { mySourceID=sid; }
00049 
00050   //! returns the source ID that will be listened for (not the source of the FilterBankEvent to be created - that depends on the subclass)
00051   virtual unsigned int getListenSourceID() const { return srcSourceID; }
00052   //! returns the generator ID that will be listened for (not the generator of the FilterBankEvent to be created - that depends on the subclass)
00053   virtual EventBase::EventGeneratorID_t getListenGeneratorID() const { return srcGenID; }
00054   //! turns on auto listening to make it easier to set up dependancies between vision filters
00055   virtual void setAutoListen(EventBase::EventGeneratorID_t gid, unsigned int sid);
00056 
00057   //! turns off auto listening
00058   virtual void unsetAutoListen();
00059 
00060 protected:
00061   //!@name Constructors
00062   //!
00063   EventGeneratorBase(const std::string& name, EventBase::EventGeneratorID_t mgid, unsigned int msid)
00064     : BehaviorBase(name), myGenID(mgid), mySourceID(msid), autoListen(false), isListening(false), srcGenID(EventBase::unknownEGID), srcSourceID(0)
00065   {}
00066   EventGeneratorBase(const std::string& name, EventBase::EventGeneratorID_t mgid, unsigned int msid,EventBase::EventGeneratorID_t srcgid, unsigned int srcsid)
00067     : BehaviorBase(name), myGenID(mgid), mySourceID(msid), autoListen(true), isListening(false), srcGenID(srcgid), srcSourceID(srcsid)
00068   {}
00069   EventGeneratorBase(const std::string& classname, const std::string& instancename, EventBase::EventGeneratorID_t mgid, unsigned int msid)
00070     : BehaviorBase(classname,instancename), myGenID(mgid), mySourceID(msid), autoListen(false), isListening(false), srcGenID(EventBase::unknownEGID), srcSourceID(0)
00071   {}
00072   EventGeneratorBase(const std::string& classname, const std::string& instancename, EventBase::EventGeneratorID_t mgid, unsigned int msid,EventBase::EventGeneratorID_t srcgid, unsigned int srcsid)
00073     : BehaviorBase(classname,instancename), myGenID(mgid), mySourceID(msid), autoListen(true), isListening(false), srcGenID(srcgid), srcSourceID(srcsid)
00074   {}
00075   //@}
00076 
00077   EventBase::EventGeneratorID_t myGenID; //!< the generator ID to broadcast on
00078   unsigned int mySourceID;     //!< the source ID to broadcast on
00079   bool autoListen;          //!< if true, will automatically start listening for EventBase(genID,sourceID) events
00080   bool isListening;         //!< true if listening triggered by autoListen
00081   EventBase::EventGeneratorID_t srcGenID; //!< the generator ID to listen for (typically the source that this filter works on)
00082   unsigned int srcSourceID;    //!< the source ID to listen for
00083 };
00084 
00085 /*! @file
00086  * @brief 
00087  * @author ejt (Creator)
00088  *
00089  * $Author: ejt $
00090  * $Name: tekkotsu-2_2_2 $
00091  * $Revision: 1.8 $
00092  * $State: Exp $
00093  * $Date: 2004/12/20 21:47:59 $
00094  */
00095 
00096 #endif

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