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// 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.
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/containers/hash_tables.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/ref_counted_memory.h"
#include "base/memory/weak_ptr.h"
#include "base/task_runner.h"
#include "base/threading/thread_checker.h"
#include "components/image_fetcher/image_fetcher_delegate.h"
#include "components/leveldb_proto/proto_database.h"
#include "components/suggestions/proto/suggestions.pb.h"
#include "ui/gfx/image/image_skia.h"
#include "url/gurl.h"
namespace gfx {
class Image;
namespace image_fetcher {
class ImageFetcher;
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 ImageManager : public image_fetcher::ImageFetcherDelegate {
typedef std::vector<ImageData> ImageDataVector;
using ImageCallback = base::Callback<void(const GURL&, const gfx::Image&)>;
std::unique_ptr<image_fetcher::ImageFetcher> image_fetcher,
std::unique_ptr<leveldb_proto::ProtoDatabase<ImageData>> database,
const base::FilePath& database_dir,
scoped_refptr<base::TaskRunner> background_task_runner);
~ImageManager() override;
virtual void Initialize(const SuggestionsProfile& suggestions);
// Should be called from the UI thread.
virtual void AddImageURL(const GURL& url, const GURL& image_url);
// Should be called from the UI thread.
virtual void GetImageForURL(const GURL& url, ImageCallback callback);
// Methods inherited from image_fetcher::ImageFetcherDelegate
// Perform additional tasks when an image has been fetched.
void OnImageFetched(const std::string& url, const gfx::Image& image) override;
friend class MockImageManager;
friend class ImageManagerTest;
FRIEND_TEST_ALL_PREFIXES(ImageManagerTest, InitializeTest);
FRIEND_TEST_ALL_PREFIXES(ImageManagerTest, GetImageForURLNetworkCacheHit);
// Used for testing.
typedef std::vector<base::Callback<void(const GURL&, const gfx::Image&)> >
typedef base::hash_map<std::string, scoped_refptr<base::RefCountedMemory>>
// State related to an image fetch (associated website url, image_url,
// pending callbacks).
struct ImageCacheRequest {
ImageCacheRequest(const ImageCacheRequest& other);
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, ImageCallback callback);
void ServeFromCacheOrNetwork(
const GURL& url, const GURL& image_url, ImageCallback callback);
void OnCacheImageDecoded(
const GURL& url,
const GURL& image_url,
const ImageCallback& callback,
std::unique_ptr<SkBitmap> bitmap);
// Returns null if the |url| had no entry in the cache.
scoped_refptr<base::RefCountedMemory> GetEncodedImageFromCache(
const GURL& url);
// Save the image bitmap in the cache and in the database.
void SaveImage(const std::string& 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, std::unique_ptr<ImageDataVector> entries);
void OnDatabaseSave(bool success);
// Take entries from the database and put them in the local cache.
void LoadEntriesInCache(std::unique_ptr<ImageDataVector> entries);
void ServePendingCacheRequests();
// 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_;
std::unique_ptr<image_fetcher::ImageFetcher> image_fetcher_;
std::unique_ptr<leveldb_proto::ProtoDatabase<ImageData>> database_;
scoped_refptr<base::TaskRunner> background_task_runner_;
bool database_ready_;
base::ThreadChecker thread_checker_;
base::WeakPtrFactory<ImageManager> weak_ptr_factory_;
} // namespace suggestions