Revert of [Suggestions] Move ImageManager to the component

components/suggestions/image_manager.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 COMPONENTS_SUGGESTIONS_IMAGE_MANAGER_H_
 #define COMPONENTS_SUGGESTIONS_IMAGE_MANAGER_H_
 
-#include <map>
-#include <string>
-#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 "base/threading/thread_checker.h"
-#include "components/leveldb_proto/proto_database.h"
-#include "components/suggestions/image_fetcher_delegate.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 ImageFetcher;
-class SuggestionsProfile;
+// An interface to retrieve images related to a specific URL.
+class ImageManager {
+ public:
+  ImageManager() {}
+  virtual ~ImageManager() {}
 
-// A class used to fetch server images asynchronously and manage the caching
-// layer (both in memory and on disk).
-class ImageManager : public ImageFetcherDelegate {
- public:
-  typedef std::vector<ImageData> ImageDataVector;
+  // (Re)Initializes states using data received from a SuggestionService. We're
+  // not doing this in the constructor because an instance may be long-lived.
+  virtual void Initialize(const SuggestionsProfile& suggestions) = 0;
 
-  ImageManager(scoped_ptr<ImageFetcher> image_fetcher,
-               scoped_ptr<leveldb_proto::ProtoDatabase<ImageData> > database,
-               const base::FilePath& database_dir);
-  virtual ~ImageManager();
-
-  virtual void Initialize(const SuggestionsProfile& suggestions);
-
-  // Should be called from the UI thread.
+  // Retrieves stored image for website |url| asynchronously. Calls |callback|
+  // with Bitmap pointer if found, and NULL otherwise.
   virtual void GetImageForURL(
       const GURL& url,
-      base::Callback<void(const GURL&, const SkBitmap*)> callback);
-
- protected:
-  // Perform additional tasks when an image has been fetched.
-  virtual void OnImageFetched(const GURL& url, const SkBitmap* bitmap) OVERRIDE;
+      base::Callback<void(const GURL&, const SkBitmap*)> callback) = 0;
 
  private:
-  friend class MockImageManager;
-  friend class ImageManagerTest;
-  FRIEND_TEST_ALL_PREFIXES(ImageManagerTest, InitializeTest);
-  FRIEND_TEST_ALL_PREFIXES(ImageManagerTest, GetImageForURLNetworkCacheHit);
-  FRIEND_TEST_ALL_PREFIXES(ImageManagerTest,
-                           GetImageForURLNetworkCacheNotInitialized);
-
-  // Used for testing.
-  ImageManager();
-
-  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,
-  // pending callbacks).
-  struct ImageCacheRequest {
-    ImageCacheRequest();
-    ~ImageCacheRequest();
-
-    GURL url;
-    GURL image_url;
-    // Queue for pending callbacks, which may accumulate while the request is in
-    // flight.
-    CallbackVector callbacks;
-  };
-
-  typedef std::map<const GURL, ImageCacheRequest> ImageCacheRequestMap;
-
-  // 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);
-
-  // 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 website URL to request information, used for pending cache
-  // requests while the database hasn't loaded.
-  ImageCacheRequestMap pending_cache_requests_;
-
-  // Holding the bitmaps in memory, keyed by website URL string.
-  ImageMap image_map_;
-
-  scoped_ptr<ImageFetcher> image_fetcher_;
-
-  scoped_ptr<leveldb_proto::ProtoDatabase<ImageData> > database_;
-
-  bool database_ready_;
-
-  base::WeakPtrFactory<ImageManager> weak_ptr_factory_;
-
-  base::ThreadChecker thread_checker_;
-
   DISALLOW_COPY_AND_ASSIGN(ImageManager);
 };
 
 }  // namespace suggestions
 
 #endif  // COMPONENTS_SUGGESTIONS_IMAGE_MANAGER_H_