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authorHarpreet2016-09-03 00:36:51 +0530
committerHarpreet2016-09-03 00:36:51 +0530
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tree1a1955c5482ae608fd7f618b06f4ecc6a0d39a23 /newstructure/thirdparty/linux/include/coin/IpObserver.hpp
parent4b64cf486f5c999fd8167758cae27839f3b50848 (diff)
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-// Copyright (C) 2004, 2006 International Business Machines and others.
-// All Rights Reserved.
-// This code is published under the Eclipse Public License.
-//
-// $Id: IpObserver.hpp 2161 2013-01-01 20:39:05Z stefan $
-//
-// Authors: Carl Laird, Andreas Waechter IBM 2004-08-13
-
-#ifndef __IPOBSERVER_HPP__
-#define __IPOBSERVER_HPP__
-
-#include "IpUtils.hpp"
-#include <vector>
-#include <algorithm>
-
-//#define IP_DEBUG_OBSERVER
-#if COIN_IPOPT_CHECKLEVEL > 2
-# define IP_DEBUG_OBSERVER
-#endif
-#ifdef IP_DEBUG_OBSERVER
-# include "IpDebug.hpp"
-#endif
-
-namespace Ipopt
-{
- /** Forward declarations */
- class Subject;
-
- /** Slight Variation of the Observer Design Pattern.
- * This class implements the Observer class of the
- * Observer Design Pattern. An Observer "Attach"es
- * to a Subject, indicating that it would like to
- * be notified of changes in the Subject.
- * Any derived class wishing to recieve notifications
- * from a Subject should inherit off of
- * Observer and overload the protected method,
- * RecieveNotification_(...).
- */
- class Observer
- {
- public:
-#ifdef IP_DEBUG_OBSERVER
-
- static const Index dbg_verbosity;
-#endif
-
- /**@name Constructors/Destructors */
- //@{
- /** Default Constructor */
- Observer()
- {}
-
- /** Default destructor */
- inline
- virtual ~Observer();
- //@}
-
- /** Enumeration specifying the type of notification */
- enum NotifyType
- {
- NT_All,
- NT_BeingDestroyed,
- NT_Changed
- };
-
- protected:
- /** Derived classes should call this method
- * to request an "Attach" to a Subject. Do
- * not call "Attach" explicitly on the Subject
- * since further processing is done here
- */
- inline
- void RequestAttach(NotifyType notify_type, const Subject* subject);
-
- /** Derived classes should call this method
- * to request a "Detach" to a Subject. Do
- * not call "Detach" explicitly on the Subject
- * since further processing is done here
- */
- inline
- void RequestDetach(NotifyType notify_type, const Subject* subject);
-
- /** Derived classes should overload this method to
- * recieve the requested notification from
- * attached Subjects
- */
- virtual void RecieveNotification(NotifyType notify_type, const Subject* subject)=0;
-
- private:
- /**@name Default Compiler Generated Methods
- * (Hidden to avoid implicit creation/calling).
- * These methods are not implemented and
- * we do not want the compiler to implement
- * them for us, so we declare them private
- * and do not define them. This ensures that
- * they will not be implicitly created/called. */
- //@{
- /** Copy Constructor */
- Observer(const Observer&);
-
- /** Overloaded Equals Operator */
- void operator=(const Observer&);
- //@}
-
- /** A list of the subjects currently being
- * observed. */
- std::vector<const Subject*> subjects_;
-
- /** Private Method for Recieving Notification
- * should only be called by the friend class
- * Subject. This method will, in turn, call
- * the overloaded RecieveNotification method
- * for the derived class to process.
- */
- inline
- void ProcessNotification(NotifyType notify_type, const Subject* subject);
-
- friend class Subject;
- };
-
- /** Slight Variation of the Observer Design Pattern (Subject part).
- * This class implements the Subject class of the Observer Design
- * Pattern. An Observer "Attach"es to a Subject, indicating that it
- * would like to be notified of changes in the Subject. Any
- * derived class that is to be observed has to inherit off the
- * Subject base class. If the subject needs to notify the
- * Observer, it calls the Notify method.
- */
- class Subject
- {
- public:
-#ifdef IP_DEBUG_OBSERVER
-
- static const Index dbg_verbosity;
-#endif
-
- /**@name Constructors/Destructors */
- //@{
- /** Default Constructor */
- Subject()
- {}
-
- /** Default destructor */
- inline
- virtual ~Subject();
- //@}
-
- /**@name Methods to Add and Remove Observers.
- * Currently, the notify_type flags are not used,
- * and Observers are attached in general and will
- * recieve all notifications (of the type requested
- * and possibly of types not requested). It is
- * up to the observer to ignore the types they
- * are not interested in. The NotifyType in the
- * parameter list is so a more efficient mechanism
- * depending on type could be implemented later if
- * necessary.*/
- //@{
-
- /** Attach the specified observer
- * (i.e., begin recieving notifications). */
- inline
- void AttachObserver(Observer::NotifyType notify_type, Observer* observer) const;
-
- /** Detach the specified observer
- * (i.e., no longer recieve notifications). */
- inline
- void DetachObserver(Observer::NotifyType notify_type, Observer* observer) const;
- //@}
-
- protected:
-
- inline
- void Notify(Observer::NotifyType notify_type) const;
-
- private:
- /**@name Default Compiler Generated Methods
- * (Hidden to avoid implicit creation/calling).
- * These methods are not implemented and
- * we do not want the compiler to implement
- * them for us, so we declare them private
- * and do not define them. This ensures that
- * they will not be implicitly created/called. */
- //@{
- /** Copy Constructor */
- Subject(const Subject&);
-
- /** Overloaded Equals Operator */
- void operator=(const Subject&);
- //@}
-
- mutable std::vector<Observer*> observers_;
-
- };
-
- /* inline methods */
- inline
- Observer::~Observer()
- {
-#ifdef IP_DEBUG_OBSERVER
- DBG_START_METH("Observer::~Observer", dbg_verbosity);
- if (DBG_VERBOSITY()>=1) {
- for (Index i=0; i<(Index)subjects_.size(); i++) {
- DBG_PRINT((1,"subjects_[%d] = 0x%x\n", i, subjects_[i]));
- }
- }
-#endif
- // Detach all subjects
- for (Int i=(Int)(subjects_.size()-1); i>=0; i--) {
-#ifdef IP_DEBUG_OBSERVER
- DBG_PRINT((1,"About to detach subjects_[%d] = 0x%x\n", i, subjects_[i]));
-#endif
-
- RequestDetach(NT_All, subjects_[i]);
- }
- }
-
- inline
- void Observer::RequestAttach(NotifyType notify_type, const Subject* subject)
- {
-#ifdef IP_DEBUG_OBSERVER
- DBG_START_METH("Observer::RequestAttach", dbg_verbosity);
-
- // Add the subject to the list if it does not already exist
- std::vector<const Subject*>::iterator attached_subject;
- attached_subject = std::find(subjects_.begin(), subjects_.end(), subject);
- DBG_ASSERT(attached_subject == subjects_.end());
- DBG_ASSERT(subject);
-#endif
-
- // add the subject to the list
- subjects_.push_back(subject);
- // Attach the observer to the subject
- subject->AttachObserver(notify_type, this);
- }
-
- inline
- void Observer::RequestDetach(NotifyType notify_type, const Subject* subject)
- {
-#ifdef IP_DEBUG_OBSERVER
- DBG_START_METH("Observer::RequestDetach", dbg_verbosity);
- DBG_PRINT((1, "Requesting detach of subject: 0x%x\n", subject));
- DBG_ASSERT(subject);
-#endif
-
- if (subject) {
- std::vector<const Subject*>::iterator attached_subject;
- attached_subject = std::find(subjects_.begin(), subjects_.end(), subject);
-#ifdef IP_DEBUG_OBSERVER
-
- DBG_ASSERT(attached_subject != subjects_.end());
-#endif
-
- if (attached_subject != subjects_.end()) {
-#ifdef IP_DEBUG_OBSERVER
- DBG_PRINT((1, "Removing subject: 0x%x from the list\n", subject));
-#endif
-
- subjects_.erase(attached_subject);
- }
-
- // Detach the observer from the subject
- subject->DetachObserver(notify_type, this);
- }
- }
-
- inline
- void Observer::ProcessNotification(NotifyType notify_type, const Subject* subject)
- {
-#ifdef IP_DEBUG_OBSERVER
- DBG_START_METH("Observer::ProcessNotification", dbg_verbosity);
- DBG_ASSERT(subject);
-#endif
-
- if (subject) {
- std::vector<const Subject*>::iterator attached_subject;
- attached_subject = std::find(subjects_.begin(), subjects_.end(), subject);
-
- // We must be processing a notification for a
- // subject that was previously attached.
-#ifdef IP_DEBUG_OBSERVER
-
- DBG_ASSERT(attached_subject != subjects_.end());
-#endif
-
- this->RecieveNotification(notify_type, subject);
-
- if (notify_type == NT_BeingDestroyed) {
- // the subject is going away, remove it from our list
- subjects_.erase(attached_subject);
- }
- }
- }
-
- inline
- Subject::~Subject()
- {
-#ifdef IP_DEBUG_OBSERVER
- DBG_START_METH("Subject::~Subject", dbg_verbosity);
-#endif
-
- std::vector<Observer*>::iterator iter;
- for (iter = observers_.begin(); iter != observers_.end(); iter++) {
- (*iter)->ProcessNotification(Observer::NT_BeingDestroyed, this);
- }
- }
-
- inline
- void Subject::AttachObserver(Observer::NotifyType notify_type, Observer* observer) const
- {
-#ifdef IP_DEBUG_OBSERVER
- DBG_START_METH("Subject::AttachObserver", dbg_verbosity);
- // current implementation notifies all observers of everything
- // they must filter the notifications that they are not interested
- // in (i.e. a hub, not a router)
- DBG_ASSERT(observer);
-
- std::vector<Observer*>::iterator attached_observer;
- attached_observer = std::find(observers_.begin(), observers_.end(), observer);
- DBG_ASSERT(attached_observer == observers_.end());
-
- DBG_ASSERT(observer);
-#endif
-
- observers_.push_back(observer);
- }
-
- inline
- void Subject::DetachObserver(Observer::NotifyType notify_type, Observer* observer) const
- {
-#ifdef IP_DEBUG_OBSERVER
- DBG_START_METH("Subject::DetachObserver", dbg_verbosity);
- DBG_ASSERT(observer);
-#endif
-
- if (observer) {
- std::vector<Observer*>::iterator attached_observer;
- attached_observer = std::find(observers_.begin(), observers_.end(), observer);
-#ifdef IP_DEBUG_OBSERVER
-
- DBG_ASSERT(attached_observer != observers_.end());
-#endif
-
- if (attached_observer != observers_.end()) {
- observers_.erase(attached_observer);
- }
- }
- }
-
- inline
- void Subject::Notify(Observer::NotifyType notify_type) const
- {
-#ifdef IP_DEBUG_OBSERVER
- DBG_START_METH("Subject::Notify", dbg_verbosity);
-#endif
-
- std::vector<Observer*>::iterator iter;
- for (iter = observers_.begin(); iter != observers_.end(); iter++) {
- (*iter)->ProcessNotification(notify_type, this);
- }
- }
-
-
-} // namespace Ipopt
-
-#endif