| // Copyright 2018 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_IMAGE_FETCHER_CORE_CACHED_IMAGE_FETCHER_H_ |
| #define COMPONENTS_IMAGE_FETCHER_CORE_CACHED_IMAGE_FETCHER_H_ |
| |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "base/memory/weak_ptr.h" |
| #include "base/sequence_checker.h" |
| #include "components/image_fetcher/core/image_decoder.h" |
| #include "components/image_fetcher/core/image_fetcher.h" |
| #include "components/image_fetcher/core/image_fetcher_types.h" |
| #include "net/traffic_annotation/network_traffic_annotation.h" |
| #include "ui/gfx/geometry/size.h" |
| #include "url/gurl.h" |
| |
| namespace image_fetcher { |
| |
| class ImageCache; |
| class ImageFetcher; |
| struct RequestMetadata; |
| |
| // Encapsulates a request to simplify argument lists. |
| struct CachedImageFetcherRequest; |
| |
| // CachedImageFetcher takes care of fetching images from the network and caching |
| // them. Has a read-only mode which doesn't perform write operations on the |
| // cache. |
| class CachedImageFetcher : public ImageFetcher { |
| public: |
| CachedImageFetcher(ImageFetcher* image_fetcher, |
| scoped_refptr<ImageCache> image_cache, |
| bool read_only); |
| ~CachedImageFetcher() override; |
| |
| // ImageFetcher: |
| void FetchImageAndData(const GURL& image_url, |
| ImageDataFetcherCallback image_data_callback, |
| ImageFetcherCallback image_callback, |
| ImageFetcherParams params) override; |
| ImageDecoder* GetImageDecoder() override; |
| |
| private: |
| // Cache |
| void OnImageFetchedFromCache( |
| CachedImageFetcherRequest request, |
| ImageDataFetcherCallback image_data_callback, |
| ImageFetcherCallback image_callback, |
| std::string image_data); |
| void OnImageDecodedFromCache( |
| CachedImageFetcherRequest request, |
| ImageDataFetcherCallback image_data_callback, |
| ImageFetcherCallback image_callback, |
| const gfx::Image& image); |
| |
| // Network |
| void EnqueueFetchImageFromNetwork( |
| CachedImageFetcherRequest request, |
| ImageDataFetcherCallback image_data_callback, |
| ImageFetcherCallback image_callback); |
| void FetchImageFromNetwork( |
| CachedImageFetcherRequest request, |
| ImageDataFetcherCallback image_data_callback, |
| ImageFetcherCallback image_callback); |
| void StoreImageDataWithoutTranscoding( |
| CachedImageFetcherRequest request, |
| ImageDataFetcherCallback image_data_callback, |
| const std::string& image_data, |
| const RequestMetadata& request_metadata); |
| void StoreImageDataWithTranscoding(CachedImageFetcherRequest request, |
| ImageFetcherCallback image_data_callback, |
| const gfx::Image& image, |
| const RequestMetadata& request_metadata); |
| void StoreData(CachedImageFetcherRequest request, std::string image_data); |
| |
| // Owned by ImageFetcherService. |
| ImageFetcher* image_fetcher_; |
| scoped_refptr<ImageCache> image_cache_; |
| |
| // Whether the ImageCache is allowed to be modified in any way from requests |
| // made by this CachedImageFetcher. This includes updating last used times, |
| // writing new data to the cache, or cleaning up unreadable data. Note that |
| // the ImageCache may still decide to perform eviction/reconciliation even |
| // when only read only CachedImageFetchers are using it. |
| bool read_only_; |
| |
| // Used to ensure that operations are performed on the sequence that this |
| // object was created on. |
| SEQUENCE_CHECKER(sequence_checker_); |
| |
| base::WeakPtrFactory<CachedImageFetcher> weak_ptr_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CachedImageFetcher); |
| }; |
| |
| } // namespace image_fetcher |
| |
| #endif // COMPONENTS_IMAGE_FETCHER_CORE_CACHED_IMAGE_FETCHER_H_ |