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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 CHROME_BROWSER_PRERENDER_PRERENDER_TRACKER_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_TRACKER_H_
#include <map>
#include <utility>
#include "base/memory/weak_ptr.h"
#include "url/gurl.h"
namespace prerender {
class PrerenderPendingSwapThrottle;
// Global object for maintaining prerender state on the IO thread.
class PrerenderTracker {
public:
typedef std::pair<int, int> ChildRouteIdPair;
PrerenderTracker();
virtual ~PrerenderTracker();
// Returns whether or not a RenderFrame and URL are regarding a pending
// prerender swap. Can only be called on the IO thread.
bool IsPendingSwapRequestOnIOThread(int render_process_id,
int render_frame_id,
const GURL& url) const;
// Called when a PrerenderPendingSwapThrottle defers a request. Cancel or
// Resume will be called on |throttle| when the prerender is canceled or used,
// respectively.
void AddPendingSwapThrottleOnIOThread(
int render_process_id, int render_frame_id, const GURL& url,
const base::WeakPtr<PrerenderPendingSwapThrottle>& throttle);
// Called to add throttles for a pending prerender swap.
void AddPrerenderPendingSwap(
const ChildRouteIdPair& render_frame_route_id_pair,
const GURL& url);
// Called to remove the throttles for a pending prerender swap.
void RemovePrerenderPendingSwap(
const ChildRouteIdPair& render_frame_route_id_pair,
bool swap_successful);
private:
// Add/remove prerenders pending swap on the IO Thread.
void AddPrerenderPendingSwapOnIOThread(
const ChildRouteIdPair& render_frame_route_id_pair, const GURL& url);
void RemovePrerenderPendingSwapOnIOThread(
const ChildRouteIdPair& render_frame_route_id_pair,
bool swap_successful);
struct PendingSwapThrottleData {
explicit PendingSwapThrottleData(const GURL& swap_url);
~PendingSwapThrottleData();
GURL url;
base::WeakPtr<PrerenderPendingSwapThrottle> throttle;
};
// Map of pending prerender swaps and their associated throttles,
// maintained on the IO thread. The key is the routing ID pair
// of a RenderFrame.
typedef std::map<ChildRouteIdPair, PendingSwapThrottleData>
PendingSwapThrottleMap;
PendingSwapThrottleMap pending_swap_throttle_map_;
DISALLOW_COPY_AND_ASSIGN(PrerenderTracker);
};
} // namespace prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_TRACKER_H_
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