cef/libcef/tracker.h

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