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// Copyright (c) 2012 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 CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_
#define CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_vector.h"
#include "content/browser/loader/layered_resource_handler.h"
#include "content/public/browser/resource_controller.h"
#include "url/gurl.h"
namespace net {
class URLRequest;
}
namespace content {
class ResourceThrottle;
struct ResourceResponse;
// Used to apply a list of ResourceThrottle instances to an URLRequest.
class ThrottlingResourceHandler : public LayeredResourceHandler,
public ResourceController {
public:
// Takes ownership of the ResourceThrottle instances.
ThrottlingResourceHandler(scoped_ptr<ResourceHandler> next_handler,
net::URLRequest* request,
ScopedVector<ResourceThrottle> throttles);
virtual ~ThrottlingResourceHandler();
// LayeredResourceHandler overrides:
virtual bool OnRequestRedirected(const GURL& url,
ResourceResponse* response,
bool* defer) OVERRIDE;
virtual bool OnResponseStarted(ResourceResponse* response,
bool* defer) OVERRIDE;
virtual bool OnWillStart(const GURL& url, bool* defer) OVERRIDE;
virtual bool OnBeforeNetworkStart(const GURL& url, bool* defer) OVERRIDE;
// ResourceController implementation:
virtual void Cancel() OVERRIDE;
virtual void CancelAndIgnore() OVERRIDE;
virtual void CancelWithError(int error_code) OVERRIDE;
virtual void Resume() OVERRIDE;
private:
void ResumeStart();
void ResumeNetworkStart();
void ResumeRedirect();
void ResumeResponse();
// Called when the throttle at |throttle_index| defers a request. Logs the
// name of the throttle that delayed the request.
void OnRequestDefered(int throttle_index);
enum DeferredStage {
DEFERRED_NONE,
DEFERRED_START,
DEFERRED_NETWORK_START,
DEFERRED_REDIRECT,
DEFERRED_RESPONSE
};
DeferredStage deferred_stage_;
ScopedVector<ResourceThrottle> throttles_;
size_t next_index_;
GURL deferred_url_;
scoped_refptr<ResourceResponse> deferred_response_;
bool cancelled_by_resource_throttle_;
};
} // namespace content
#endif // CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_
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