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// Copyright (c) 2010 The Chromium 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 COMPONENTS_HISTORY_CORE_BROWSER_VISIT_TRACKER_H__
#define COMPONENTS_HISTORY_CORE_BROWSER_VISIT_TRACKER_H__
#include <map>
#include <vector>
#include "base/macros.h"
#include "components/history/core/browser/history_types.h"
namespace history {
// Tracks history transitions between pages. The history backend uses this to
// link up page transitions to form a chain of page visits, and to set the
// transition type properly.
//
// This class is not thread safe.
class VisitTracker {
public:
VisitTracker();
~VisitTracker();
// Notifications -------------------------------------------------------------
void AddVisit(ContextID context_id,
int nav_entry_id,
const GURL& url,
VisitID visit_id);
// When a RenderProcessHost is destroyed, we want to clear out our saved
// transitions/visit IDs for it.
void ClearCachedDataForContextID(ContextID context_id);
// Querying ------------------------------------------------------------------
// Returns the visit ID for the transition given information about the visit
// supplied by the renderer. We will return 0 if there is no appropriate
// referring visit.
VisitID GetLastVisit(ContextID context_id,
int nav_entry_id,
const GURL& url);
private:
struct Transition {
GURL url; // URL that the event happened to.
int nav_entry_id; // ID of the navigation entry.
VisitID visit_id; // Visit ID generated by history.
};
typedef std::vector<Transition> TransitionList;
// Expires oldish items in the given transition list. This keeps the list
// size small by removing items that are unlikely to be needed, which is
// important for GetReferrer which does brute-force searches of this list.
void CleanupTransitionList(TransitionList* transitions);
// Maps render view hosts to lists of recent transitions.
std::map<ContextID, TransitionList> contexts_;
DISALLOW_COPY_AND_ASSIGN(VisitTracker);
};
} // namespace history
#endif // COMPONENTS_HISTORY_CORE_BROWSER_VISIT_TRACKER_H__
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