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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef CHROME_BROWSER_HISTORY_VISIT_TRACKER_H__
#define CHROME_BROWSER_HISTORY_VISIT_TRACKER_H__
#include <list>
#include <map>
#include "base/basictypes.h"
#include "base/time.h"
#include "chrome/browser/history/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(const void* host,
int32 page_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 NotifyRenderProcessHostDestruction(const void* host);
// 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(const void* host, int32 page_id, const GURL& url);
private:
struct Transition {
GURL url; // URL that the event happened to.
int32 page_id; // ID generated by the render process host.
VisitID visit_id; // Visit ID generated by history.
};
typedef std::vector<Transition> TransitionList;
typedef std::map<const void*, TransitionList*> HostList;
// 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.
HostList hosts_;
DISALLOW_EVIL_CONSTRUCTORS(VisitTracker);
};
} // namespace history
#endif // CHROME_BROWSER_HISTORY_VISIT_TRACKER_H__
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