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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 CHROME_BROWSER_HISTORY_TOP_SITES_BACKEND_H_
#define CHROME_BROWSER_HISTORY_TOP_SITES_BACKEND_H_
#pragma once
#include "base/file_path.h"
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "chrome/browser/cancelable_request.h"
#include "chrome/browser/history/history_types.h"
class FilePath;
namespace history {
class TopSitesDatabase;
// Service used by TopSites to have db interaction happen on the DB thread. All
// public methods are invoked on the ui thread and get funneled to the DB
// thread.
class TopSitesBackend
: public base::RefCountedThreadSafe<TopSitesBackend>,
public CancelableRequestProvider {
public:
TopSitesBackend();
void Init(const FilePath& path);
// Schedules the db to be shutdown.
void Shutdown();
// The boolean parameter indicates if the DB existed on disk or needs to be
// migrated.
typedef Callback3<Handle, scoped_refptr<MostVisitedThumbnails>, bool >::Type
GetMostVisitedThumbnailsCallback;
typedef CancelableRequest1<TopSitesBackend::GetMostVisitedThumbnailsCallback,
scoped_refptr<MostVisitedThumbnails> >
GetMostVisitedThumbnailsRequest;
// Fetches MostVisitedThumbnails.
Handle GetMostVisitedThumbnails(CancelableRequestConsumerBase* consumer,
GetMostVisitedThumbnailsCallback* callback);
// Updates top sites database from the specified delta.
void UpdateTopSites(const TopSitesDelta& delta);
// Sets the thumbnail.
void SetPageThumbnail(const MostVisitedURL& url,
int url_rank,
const Images& thumbnail);
// Deletes the database and recreates it.
void ResetDatabase();
typedef Callback1<Handle>::Type EmptyRequestCallback;
typedef CancelableRequest<TopSitesBackend::EmptyRequestCallback>
EmptyRequestRequest;
// Schedules a request that does nothing on the DB thread, but then notifies
// the callback on the calling thread. This is used to make sure the db has
// finished processing a request.
Handle DoEmptyRequest(CancelableRequestConsumerBase* consumer,
EmptyRequestCallback* callback);
private:
friend class base::RefCountedThreadSafe<TopSitesBackend>;
~TopSitesBackend();
// Invokes Init on the db_.
void InitDBOnDBThread(const FilePath& path);
// Shuts down the db.
void ShutdownDBOnDBThread();
// Does the work of getting the most visted thumbnails.
void GetMostVisitedThumbnailsOnDBThread(
scoped_refptr<GetMostVisitedThumbnailsRequest> request);
// Updates top sites.
void UpdateTopSitesOnDBThread(const TopSitesDelta& delta);
// Sets the thumbnail.
void SetPageThumbnailOnDBThread(const MostVisitedURL& url,
int url_rank,
const Images& thumbnail);
// Resets the database.
void ResetDatabaseOnDBThread(const FilePath& file_path);
// Notifies the request.
void DoEmptyRequestOnDBThread(scoped_refptr<EmptyRequestRequest> request);
FilePath db_path_;
scoped_ptr<TopSitesDatabase> db_;
DISALLOW_COPY_AND_ASSIGN(TopSitesBackend);
};
} // namespace history
#endif // CHROME_BROWSER_HISTORY_TOP_SITES_BACKEND_H_
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