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// Copyright 2016 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_LOADER_PREDICTOR_RESOURCE_THROTTLE_H_
#define CHROME_BROWSER_LOADER_PREDICTOR_RESOURCE_THROTTLE_H_
#include <memory>
#include "base/macros.h"
#include "content/public/browser/resource_throttle.h"
namespace chrome_browser_net {
class Predictor;
}
namespace net {
struct RedirectInfo;
class URLRequest;
}
class ProfileIOData;
// This resource throttle tracks requests in order to help the predictor learn
// resource relationships. It notifies the predictor of redirect and referrer
// relationships, and populates the predictor's timed cache of ongoing
// navigations. It also initiates predictive actions based on subframe
// requests and redirects.
// Note: This class does not issue predictive actions off of the initial main
// frame request (before any redirects). That is done on the UI thread in
// response to navigation callbacks in predictor_tab_helper.cc.
// TODO(csharrison): This class shouldn't depend on chrome_browser_net. The
// predictor should probably be moved here (along with its dependencies).
// TODO(csharrison): When the PreconnectMore experiment is over, move all
// prediction dispatching to the tab helper.
class PredictorResourceThrottle : public content::ResourceThrottle {
public:
PredictorResourceThrottle(net::URLRequest* request,
chrome_browser_net::Predictor* predictor);
~PredictorResourceThrottle() override;
static std::unique_ptr<PredictorResourceThrottle> MaybeCreate(
net::URLRequest* request,
ProfileIOData* io_data);
// content::ResourceThrottle:
void WillStartRequest(bool* defer) override;
void WillRedirectRequest(const net::RedirectInfo& redirect_info,
bool* defer) override;
const char* GetNameForLogging() const override;
private:
net::URLRequest* request_;
chrome_browser_net::Predictor* predictor_;
DISALLOW_COPY_AND_ASSIGN(PredictorResourceThrottle);
};
#endif // CHROME_BROWSER_LOADER_PREDICTOR_RESOURCE_THROTTLE_H_
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