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// Copyright 2013 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_PRERENDER_PRERENDER_RESOURCE_THROTTLE_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_THROTTLE_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "content/public/browser/resource_throttle.h"
#include "content/public/common/resource_type.h"
namespace net {
class URLRequest;
}
namespace prerender {
class PrerenderContents;
// This class implements policy on resource requests in prerenders. It cancels
// prerenders on certain requests. It also defers certain requests until after
// the prerender is swapped in.
//
// TODO(davidben): Experiment with deferring network requests that
// would otherwise cancel the prerender.
class PrerenderResourceThrottle
: public content::ResourceThrottle,
public base::SupportsWeakPtr<PrerenderResourceThrottle> {
public:
explicit PrerenderResourceThrottle(net::URLRequest* request);
// content::ResourceThrottle implementation:
virtual void WillStartRequest(bool* defer) OVERRIDE;
virtual void WillRedirectRequest(const GURL& new_url, bool* defer) OVERRIDE;
virtual const char* GetNameForLogging() const OVERRIDE;
// Called by the PrerenderContents when a prerender becomes visible.
// May only be called if currently throttling the resource.
void Resume();
static void OverridePrerenderContentsForTesting(PrerenderContents* contents);
private:
// Helper method to cancel the request. May only be called if currently
// throttling the resource.
void Cancel();
static void WillStartRequestOnUI(
const base::WeakPtr<PrerenderResourceThrottle>& throttle,
const std::string& method,
content::ResourceType resource_type,
int render_process_id,
int render_frame_id,
const GURL& url);
static void WillRedirectRequestOnUI(
const base::WeakPtr<PrerenderResourceThrottle>& throttle,
const std::string& follow_only_when_prerender_shown_header,
content::ResourceType resource_type,
bool async,
int render_process_id,
int render_frame_id,
const GURL& new_url);
// Helper to return the PrerenderContents given a render frame id. May return
// NULL if it's gone.
static PrerenderContents* PrerenderContentsFromRenderFrame(
int render_process_id, int render_frame_id);
net::URLRequest* request_;
DISALLOW_COPY_AND_ASSIGN(PrerenderResourceThrottle);
};
} // namespace prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_THROTTLE_H_
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