cef/libcef/common/tracker.h

78 lines
2.4 KiB
C++

// Copyright (c) 2012 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 CEF_LIBCEF_COMMON_TRACKER_H_
#define CEF_LIBCEF_COMMON_TRACKER_H_
#pragma once
#include "include/cef_base.h"
#include "base/synchronization/lock.h"
// Class extended by objects that must be tracked. After creating a tracked
// object you should add it to the appropriate track manager.
class CefTrackNode {
public:
CefTrackNode();
virtual ~CefTrackNode();
// Returns true if the object is currently being tracked.
inline bool IsTracked() { return (track_prev_ || track_next_); }
private:
inline CefTrackNode* GetTrackPrev() { return track_prev_; }
inline void SetTrackPrev(CefTrackNode* base) { track_prev_ = base; }
inline CefTrackNode* GetTrackNext() { return track_next_; }
inline void SetTrackNext(CefTrackNode* base) { track_next_ = base; }
// Insert a new object into the tracking list before this object.
void InsertTrackPrev(CefTrackNode* object);
// Insert a new object into the tracking list after this object.
void InsertTrackNext(CefTrackNode* object);
// Remove this object from the tracking list.
void RemoveTracking();
private:
CefTrackNode* track_next_;
CefTrackNode* 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 = LAZY_INSTANCE_INITIALIZER;
class CefTrackManager : public CefBaseRefCounted {
public:
CefTrackManager();
~CefTrackManager() override;
// Add an object to be tracked by this manager.
void Add(CefTrackNode* object);
// Delete an object tracked by this manager.
bool Delete(CefTrackNode* object);
// Delete all objects tracked by this manager.
void DeleteAll();
// Returns the number of objects currently being tracked.
inline int GetCount() { return object_count_; }
private:
CefTrackNode tracker_;
int object_count_;
base::Lock lock_;
IMPLEMENT_REFCOUNTING(CefTrackManager);
};
#endif // CEF_LIBCEF_COMMON_TRACKER_H_