Componentize TopSites, TopSitesBackend, TopSitesDatabase

chrome/browser/history/top_sites_backend.cc

Index: chrome/browser/history/top_sites_backend.cc
diff --git a/chrome/browser/history/top_sites_backend.cc b/chrome/browser/history/top_sites_backend.cc
deleted file mode 100644
index fdecd1c869ef93b657aa09365ea803e89e31f791..0000000000000000000000000000000000000000
--- a/chrome/browser/history/top_sites_backend.cc
+++ /dev/null
@@ -1,140 +0,0 @@
-// Copyright (c) 2011 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.
-
-#include "chrome/browser/history/top_sites_backend.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-#include "base/task/cancelable_task_tracker.h"
-#include "chrome/browser/history/top_sites_database.h"
-#include "content/public/browser/browser_thread.h"
-#include "sql/connection.h"
-
-using content::BrowserThread;
-
-namespace history {
-
-TopSitesBackend::TopSitesBackend()
-    : db_(new TopSitesDatabase()) {
-}
-
-void TopSitesBackend::Init(const base::FilePath& path) {
-  db_path_ = path;
-  BrowserThread::PostTask(
-      BrowserThread::DB, FROM_HERE,
-      base::Bind(&TopSitesBackend::InitDBOnDBThread, this, path));
-}
-
-void TopSitesBackend::Shutdown() {
-  BrowserThread::PostTask(
-      BrowserThread::DB, FROM_HERE,
-      base::Bind(&TopSitesBackend::ShutdownDBOnDBThread, this));
-}
-
-void TopSitesBackend::GetMostVisitedThumbnails(
-    const GetMostVisitedThumbnailsCallback& callback,
-    base::CancelableTaskTracker* tracker) {
-  scoped_refptr<MostVisitedThumbnails> thumbnails = new MostVisitedThumbnails();
-
-  tracker->PostTaskAndReply(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB).get(),
-      FROM_HERE,
-      base::Bind(&TopSitesBackend::GetMostVisitedThumbnailsOnDBThread,
-                 this,
-                 thumbnails),
-      base::Bind(callback, thumbnails));
-}
-
-void TopSitesBackend::UpdateTopSites(const TopSitesDelta& delta) {
-  BrowserThread::PostTask(
-      BrowserThread::DB, FROM_HERE,
-      base::Bind(&TopSitesBackend::UpdateTopSitesOnDBThread, this, delta));
-}
-
-void TopSitesBackend::SetPageThumbnail(const MostVisitedURL& url,
-                                       int url_rank,
-                                       const Images& thumbnail) {
-  BrowserThread::PostTask(
-      BrowserThread::DB, FROM_HERE,
-      base::Bind(&TopSitesBackend::SetPageThumbnailOnDBThread, this, url,
-                 url_rank, thumbnail));
-}
-
-void TopSitesBackend::ResetDatabase() {
-  BrowserThread::PostTask(
-      BrowserThread::DB, FROM_HERE,
-      base::Bind(&TopSitesBackend::ResetDatabaseOnDBThread, this, db_path_));
-}
-
-void TopSitesBackend::DoEmptyRequest(const base::Closure& reply,
-                                     base::CancelableTaskTracker* tracker) {
-  tracker->PostTaskAndReply(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB).get(),
-      FROM_HERE,
-      base::Bind(&base::DoNothing),
-      reply);
-}
-
-TopSitesBackend::~TopSitesBackend() {
-  DCHECK(!db_);  // Shutdown should have happened first (which results in
-                 // nulling out db).
-}
-
-void TopSitesBackend::InitDBOnDBThread(const base::FilePath& path) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
-  if (!db_->Init(path)) {
-    LOG(ERROR) << "Failed to initialize database.";
-    db_.reset();
-  }
-}
-
-void TopSitesBackend::ShutdownDBOnDBThread() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
-  db_.reset();
-}
-
-void TopSitesBackend::GetMostVisitedThumbnailsOnDBThread(
-    scoped_refptr<MostVisitedThumbnails> thumbnails) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
-
-  if (db_) {
-    db_->GetPageThumbnails(&(thumbnails->most_visited),
-                           &(thumbnails->url_to_images_map));
-  }
-}
-
-void TopSitesBackend::UpdateTopSitesOnDBThread(const TopSitesDelta& delta) {
-  if (!db_)
-    return;
-
-  for (size_t i = 0; i < delta.deleted.size(); ++i)
-    db_->RemoveURL(delta.deleted[i]);
-
-  for (size_t i = 0; i < delta.added.size(); ++i)
-    db_->SetPageThumbnail(delta.added[i].url, delta.added[i].rank, Images());
-
-  for (size_t i = 0; i < delta.moved.size(); ++i)
-    db_->UpdatePageRank(delta.moved[i].url, delta.moved[i].rank);
-}
-
-void TopSitesBackend::SetPageThumbnailOnDBThread(const MostVisitedURL& url,
-                                                 int url_rank,
-                                                 const Images& thumbnail) {
-  if (!db_)
-    return;
-
-  db_->SetPageThumbnail(url, url_rank, thumbnail);
-}
-
-void TopSitesBackend::ResetDatabaseOnDBThread(const base::FilePath& file_path) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
-  db_.reset(NULL);
-  sql::Connection::Delete(db_path_);
-  db_.reset(new TopSitesDatabase());
-  InitDBOnDBThread(db_path_);
-}
-
-}  // namespace history