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// Copyright (c) 2012 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 CHROME_BROWSER_PRERENDER_PRERENDER_LOCAL_PREDICTOR_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_LOCAL_PREDICTOR_H_
#include <vector>
#include "base/timer.h"
#include "chrome/browser/common/cancelable_request.h"
#include "chrome/browser/history/visit_database.h"
#include "googleurl/src/gurl.h"
class HistoryService;
namespace prerender {
class PrerenderManager;
// PrerenderLocalPredictor maintains local browsing history to make prerender
// predictions.
// At this point, the class is not actually creating prerenders, but just
// recording timing stats about the effect prerendering would have.
class PrerenderLocalPredictor : public history::VisitDatabaseObserver {
public:
enum Event {
EVENT_CONSTRUCTED = 0,
EVENT_INIT_SCHEDULED = 1,
EVENT_INIT_STARTED = 2,
EVENT_INIT_FAILED_NO_HISTORY = 3,
EVENT_INIT_SUCCEEDED = 4,
EVENT_ADD_VISIT = 5,
EVENT_ADD_VISIT_INITIALIZED = 6,
EVENT_ADD_VISIT_PRERENDER_IDENTIFIED = 7,
EVENT_ADD_VISIT_RELEVANT_TRANSITION = 8,
EVENT_ADD_VISIT_IDENTIFIED_PRERENDER_CANDIDATE = 9,
EVENT_ADD_VISIT_PRERENDERING = 10,
EVENT_GOT_PRERENDER_URL = 11,
EVENT_ERROR_NO_PRERENDER_URL_FOR_PLT = 12,
EVENT_ADD_VISIT_PRERENDERING_EXTENDED = 13,
EVENT_PRERENDER_URL_LOOKUP_RESULT = 14,
EVENT_PRERENDER_URL_LOOKUP_RESULT_ROOT_PAGE = 15,
EVENT_PRERENDER_URL_LOOKUP_RESULT_IS_HTTP = 16,
EVENT_PRERENDER_URL_LOOKUP_RESULT_HAS_QUERY_STRING = 17,
EVENT_PRERENDER_URL_LOOKUP_RESULT_CONTAINS_LOGOUT = 18,
EVENT_PRERENDER_URL_LOOKUP_RESULT_CONTAINS_LOGIN = 19,
EVENT_START_URL_LOOKUP = 20,
EVENT_ADD_VISIT_NOT_ROOTPAGE = 21,
EVENT_MAX_VALUE
};
// A PrerenderLocalPredictor is owned by the PrerenderManager specified
// in the constructor. It will be destoryed at the time its owning
// PrerenderManager is destroyed.
explicit PrerenderLocalPredictor(PrerenderManager* prerender_manager);
virtual ~PrerenderLocalPredictor();
// history::VisitDatabaseObserver implementation
virtual void OnAddVisit(const history::BriefVisitInfo& info) OVERRIDE;
void OnLookupURL(history::URLID url_id, double priority, const GURL& url);
void OnGetInitialVisitHistory(
scoped_ptr<std::vector<history::BriefVisitInfo> > visit_history);
void OnPLTEventForURL(const GURL& url, base::TimeDelta page_load_time);
private:
struct PrerenderData;
HistoryService* GetHistoryIfExists() const;
void Init();
bool IsPrerenderStillValid(PrerenderData* prerender) const;
bool DoesPrerenderMatchPLTRecord(PrerenderData* prerender,
const GURL& url,
base::TimeDelta plt) const;
void RecordEvent(Event event) const;
// Returns whether a new prerender of the specified priority should replace
// the current prerender (based on whether it exists, whether it has expired,
// and based on what its priority is).
bool ShouldReplaceCurrentPrerender(double priority) const;
PrerenderManager* prerender_manager_;
base::OneShotTimer<PrerenderLocalPredictor> timer_;
// Delay after which to initialize, to avoid putting to much load on the
// database thread early on when Chrome is starting up.
static const int kInitDelayMs = 5 * 1000;
CancelableRequestConsumer history_db_consumer_;
scoped_ptr<std::vector<history::BriefVisitInfo> > visit_history_;
scoped_ptr<PrerenderData> current_prerender_;
scoped_ptr<PrerenderData> last_swapped_in_prerender_;
DISALLOW_COPY_AND_ASSIGN(PrerenderLocalPredictor);
};
} // namespace prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_LOCAL_PREDICTOR_H_
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