137 lines
3.4 KiB
C++
137 lines
3.4 KiB
C++
// Copyright (c) 2009 The Chromium Embedded Framework Authors. All rights
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// reserved. Use of this source code is governed by a BSD-style license that
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// can be found in the LICENSE file.
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#ifndef _TRACKER_H
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#define _TRACKER_H
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#include "include/cef.h"
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// Class extended by objects that must be tracked. After creating a tracked
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// object you should add it to the appropriate track manager.
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class CefTrackObject
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{
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public:
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CefTrackObject()
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{
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track_next_ = NULL;
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track_prev_ = NULL;
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}
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virtual ~CefTrackObject()
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{
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}
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// Returns true if the object is currently being tracked.
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bool IsTracked() { return (track_prev_ || track_next_); }
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private:
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CefTrackObject* GetTrackPrev() { return track_prev_; }
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void SetTrackPrev(CefTrackObject* base) { track_prev_ = base; }
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CefTrackObject* GetTrackNext() { return track_next_; }
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void SetTrackNext(CefTrackObject* base) { track_next_ = base; }
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// Insert a new object into the tracking list before this object.
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void InsertTrackPrev(CefTrackObject* object)
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{
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if(track_prev_)
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track_prev_->SetTrackNext(object);
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object->SetTrackNext(this);
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object->SetTrackPrev(track_prev_);
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track_prev_ = object;
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}
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// Insert a new object into the tracking list after this object.
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void InsertTrackNext(CefTrackObject* object)
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{
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if(track_next_)
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track_next_->SetTrackPrev(object);
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object->SetTrackPrev(this);
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object->SetTrackNext(track_next_);
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track_next_ = object;
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}
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// Remove this object from the tracking list.
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void RemoveTracking()
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{
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if(track_next_)
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track_next_->SetTrackPrev(track_prev_);
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if(track_prev_)
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track_prev_->SetTrackNext(track_next_);
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track_next_ = NULL;
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track_prev_ = NULL;
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}
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private:
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CefTrackObject* track_next_;
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CefTrackObject* track_prev_;
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friend class CefTrackManager;
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};
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// Class used to manage tracked objects. A single instance of this class
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// should be created for each intended usage. Any objects that have not been
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// removed by explicit calls to the Destroy() method will be removed when the
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// manager object is destroyed. A manager object can be created as either a
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// member variable of another class or by using lazy initialization:
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// base::LazyInstance<CefTrackManager> g_singleton(base::LINKER_INITIALIZED);
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class CefTrackManager : public CefThreadSafeBase<CefBase>
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{
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public:
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CefTrackManager() : object_count_(0) {}
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virtual ~CefTrackManager()
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{
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DeleteAll();
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}
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// Add an object to be tracked by this manager.
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void Add(CefTrackObject* object)
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{
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Lock();
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if(!object->IsTracked()) {
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tracker_.InsertTrackNext(object);
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++object_count_;
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}
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Unlock();
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}
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// Delete an object tracked by this manager.
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bool Delete(CefTrackObject* object)
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{
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bool rv = false;
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Lock();
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if(object->IsTracked()) {
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object->RemoveTracking();
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delete object;
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--object_count_;
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rv = true;
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}
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Unlock();
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return rv;
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}
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// Delete all objects tracked by this manager.
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void DeleteAll()
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{
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Lock();
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CefTrackObject* next;
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do {
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next = tracker_.GetTrackNext();
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if(next) {
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next->RemoveTracking();
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delete next;
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}
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} while(next != NULL);
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object_count_ = 0;
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Unlock();
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}
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// Returns the number of objects currently being tracked.
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long GetCount() { return object_count_; }
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private:
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CefTrackObject tracker_;
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long object_count_;
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};
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#endif // _TRACKER_H
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