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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.
#ifndef COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_IMPL_H_
#define COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_IMPL_H_
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "components/image_fetcher/image_data_fetcher.h"
#include "components/image_fetcher/image_decoder.h"
#include "components/image_fetcher/image_fetcher.h"
#include "url/gurl.h"
namespace gfx {
class Image;
}
namespace net {
class URLRequestContextGetter;
}
namespace image_fetcher {
// TODO(markusheintz): Once the iOS implementation of the ImageFetcher is
// removed merge the two classes ImageFetcher and ImageFetcherImpl.
class ImageFetcherImpl : public image_fetcher::ImageFetcher {
public:
ImageFetcherImpl(
std::unique_ptr<ImageDecoder> image_decoder,
net::URLRequestContextGetter* url_request_context);
~ImageFetcherImpl() override;
// Sets the |delegate| of the ImageFetcherImpl. The |delegate| has to be alive
// during the lifetime of the ImageFetcherImpl object. It is the caller's
// responsibility to ensure this.
void SetImageFetcherDelegate(ImageFetcherDelegate* delegate) override;
// Sets a service name against which to track data usage.
void SetDataUseServiceName(DataUseServiceName data_use_service_name) override;
void StartOrQueueNetworkRequest(
const std::string& id,
const GURL& image_url,
base::Callback<void(const std::string&, const gfx::Image&)> callback)
override;
private:
using CallbackVector =
std::vector<base::Callback<void(const std::string&, const gfx::Image&)>>;
// State related to an image fetch (id, pending callbacks).
struct ImageRequest {
ImageRequest();
ImageRequest(const ImageRequest& other);
~ImageRequest();
void swap(ImageRequest* other) {
std::swap(id, other->id);
std::swap(callbacks, other->callbacks);
}
std::string id;
// Queue for pending callbacks, which may accumulate while the request is in
// flight.
CallbackVector callbacks;
};
using ImageRequestMap = std::map<const GURL, ImageRequest>;
// Processes image URL fetched events. This is the continuation method used
// for creating callbacks that are passed to the ImageDataFetcher.
void OnImageURLFetched(const GURL& image_url, const std::string& image_data);
// Processes image decoded events. This is the continuation method used for
// creating callbacks that are passed to the ImageDecoder.
void OnImageDecoded(const GURL& image_url, const gfx::Image& image);
ImageFetcherDelegate* delegate_;
scoped_refptr<net::URLRequestContextGetter> url_request_context_;
std::unique_ptr<ImageDecoder> image_decoder_;
std::unique_ptr<ImageDataFetcher> image_data_fetcher_;
// Map from each image URL to the request information (associated website
// url, fetcher, pending callbacks).
ImageRequestMap pending_net_requests_;
DISALLOW_COPY_AND_ASSIGN(ImageFetcherImpl);
};
} // namespace image_fetcher
#endif // COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_IMPL_H_
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