[Suggestions] Move ImageManager to the component

chrome/browser/search/suggestions/image_manager_impl.h

-// Copyright 2014 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_SEARCH_SUGGESTIONS_IMAGE_MANAGER_IMPL_H_
-#define CHROME_BROWSER_SEARCH_SUGGESTIONS_IMAGE_MANAGER_IMPL_H_
-
-#include <map>
-#include <utility>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/callback.h"
-#include "base/containers/hash_tables.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
-#include "components/leveldb_proto/proto_database.h"
-#include "components/suggestions/image_manager.h"
-#include "components/suggestions/proto/suggestions.pb.h"
-#include "ui/gfx/image/image_skia.h"
-#include "url/gurl.h"
-
-namespace net {
-class URLRequestContextGetter;
-}
-
-namespace suggestions {
-
-class ImageData;
-class SuggestionsProfile;
-
-// A class used to fetch server images asynchronously and manage the caching
-// layer (both in memory and on disk).
-class ImageManagerImpl : public ImageManager,
-                         public chrome::BitmapFetcherDelegate {
- public:
-  typedef std::vector<ImageData> ImageDataVector;
-
-  ImageManagerImpl(
-      net::URLRequestContextGetter* url_request_context,
-      scoped_ptr<leveldb_proto::ProtoDatabase<ImageData> > database,
-      const base::FilePath& database_dir);
-  virtual ~ImageManagerImpl();
-
-  // Overrides from ImageManager.
-  virtual void Initialize(const SuggestionsProfile& suggestions) OVERRIDE;
-  // Should be called from the UI thread.
-  virtual void GetImageForURL(
-      const GURL& url,
-      base::Callback<void(const GURL&, const SkBitmap*)> callback) OVERRIDE;
-
- private:
-  friend class MockImageManagerImpl;
-  friend class ImageManagerImplBrowserTest;
-  FRIEND_TEST_ALL_PREFIXES(ImageManagerImplTest, InitializeTest);
-  FRIEND_TEST_ALL_PREFIXES(ImageManagerImplBrowserTest,
-                           GetImageForURLNetworkCacheHit);
-  FRIEND_TEST_ALL_PREFIXES(ImageManagerImplBrowserTest,
-                           GetImageForURLNetworkCacheNotInitialized);
-
-  // Used for testing.
-  ImageManagerImpl();
-
-  typedef std::vector<base::Callback<void(const GURL&, const SkBitmap*)> >
-      CallbackVector;
-  typedef base::hash_map<std::string, SkBitmap> ImageMap;
-
-  // State related to an image fetch (associated website url, image_url,
-  // fetcher, pending callbacks).
-  struct ImageRequest {
-    ImageRequest();
-    explicit ImageRequest(chrome::BitmapFetcher* f);
-    ~ImageRequest();
-
-    void swap(ImageRequest* other) {
-      std::swap(url, other->url);
-      std::swap(image_url, other->image_url);
-      std::swap(callbacks, other->callbacks);
-      std::swap(fetcher, other->fetcher);
-    }
-
-    GURL url;
-    GURL image_url;
-    chrome::BitmapFetcher* fetcher;
-    // Queue for pending callbacks, which may accumulate while the request is in
-    // flight.
-    CallbackVector callbacks;
-  };
-
-  typedef std::map<const GURL, ImageRequest> ImageRequestMap;
-
-  // Looks up image URL for |url|. If found, writes the result to |image_url|
-  // and returns true. Otherwise just returns false.
-  bool GetImageURL(const GURL& url, GURL* image_url);
-
-  void QueueCacheRequest(
-      const GURL& url, const GURL& image_url,
-      base::Callback<void(const GURL&, const SkBitmap*)> callback);
-
-  void ServeFromCacheOrNetwork(
-      const GURL& url, const GURL& image_url,
-      base::Callback<void(const GURL&, const SkBitmap*)> callback);
-
-  // Will return false if no bitmap was found corresponding to |url|, else
-  // return true and call |callback| with the found bitmap.
-  bool ServeFromCache(
-      const GURL& url,
-      base::Callback<void(const GURL&, const SkBitmap*)> callback);
-
-  // Returns null if the |url| had no entry in the cache.
-  SkBitmap* GetBitmapFromCache(const GURL& url);
-
-  void StartOrQueueNetworkRequest(
-      const GURL& url, const GURL& image_url,
-      base::Callback<void(const GURL&, const SkBitmap*)> callback);
-
-  // Inherited from BitmapFetcherDelegate. Runs on the UI thread.
-  virtual void OnFetchComplete(const GURL image_url,
-                               const SkBitmap* bitmap) OVERRIDE;
-
-  // Save the image bitmap in the cache and in the database.
-  void SaveImage(const GURL& url, const SkBitmap& bitmap);
-
-  // Database callback methods.
-  // Will initiate loading the entries.
-  void OnDatabaseInit(bool success);
-  // Will transfer the loaded |entries| in memory (|image_map_|).
-  void OnDatabaseLoad(bool success, scoped_ptr<ImageDataVector> entries);
-  void OnDatabaseSave(bool success);
-
-  // Take entries from the database and put them in the local cache.
-  void LoadEntriesInCache(scoped_ptr<ImageDataVector> entries);
-
-  void ServePendingCacheRequests();
-
-  // From SkBitmap to the vector of JPEG-encoded bytes, |dst|. Visible only for
-  // testing.
-  static bool EncodeImage(const SkBitmap& bitmap,
-                          std::vector<unsigned char>* dest);
-
-  // Map from URL to image URL. Should be kept up to date when a new
-  // SuggestionsProfile is available.
-  std::map<GURL, GURL> image_url_map_;
-
-  // Map from each image URL to the request information (associated website
-  // url, fetcher, pending callbacks).
-  ImageRequestMap pending_net_requests_;
-
-  // Map from website URL to request information, used for pending cache
-  // requests while the database hasn't loaded.
-  ImageRequestMap pending_cache_requests_;
-
-  // Holding the bitmaps in memory, keyed by website URL string.
-  ImageMap image_map_;
-
-  net::URLRequestContextGetter* url_request_context_;
-
-  scoped_ptr<leveldb_proto::ProtoDatabase<ImageData> > database_;
-
-  bool database_ready_;
-
-  base::WeakPtrFactory<ImageManagerImpl> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(ImageManagerImpl);
-};
-
-}  // namespace suggestions
-
-#endif  // CHROME_BROWSER_SEARCH_SUGGESTIONS_IMAGE_MANAGER_IMPL_H_