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// Copyright 2017 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_UKM_OBSERVERS_HISTORY_DELETE_OBSERVER_H_
#define COMPONENTS_UKM_OBSERVERS_HISTORY_DELETE_OBSERVER_H_
#include <set>
#include "base/scoped_observer.h"
#include "components/history/core/browser/history_service_observer.h"
namespace ukm {
// Observes multiple HistoryService objects for any events that delete history.
// Handles cleanup and removing observers as objects are destroyed.
class HistoryDeleteObserver : public history::HistoryServiceObserver {
public:
HistoryDeleteObserver();
~HistoryDeleteObserver() override;
// Starts observing a service for history deletions.
void ObserveServiceForDeletions(history::HistoryService* history_service);
// history::HistoryServiceObserver
void OnURLsDeleted(history::HistoryService* history_service,
bool all_history,
bool expired,
const history::URLRows& deleted_rows,
const std::set<GURL>& favicon_urls) override;
void HistoryServiceBeingDeleted(
history::HistoryService* history_service) override;
protected:
virtual void OnHistoryDeleted() = 0;
private:
// Tracks observed history services, for cleanup.
ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
history_observer_;
DISALLOW_COPY_AND_ASSIGN(HistoryDeleteObserver);
};
} // namespace ukm
#endif // COMPONENTS_UKM_OBSERVERS_HISTORY_DELETE_OBSERVER_H_
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