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// Copyright (c) 2011 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_MANAGER_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
#pragma once
#include <list>
#include <vector>
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "base/time.h"
#include "googleurl/src/gurl.h"
class PrerenderContents;
class Profile;
class TabContents;
// PrerenderManager is responsible for initiating and keeping prerendered
// views of webpages.
class PrerenderManager : public base::RefCounted<PrerenderManager>,
private base::NonThreadSafe {
public:
// Owned by a Profile object for the lifetime of the profile.
explicit PrerenderManager(Profile* profile);
// Preloads the URL supplied. alias_urls indicates URLs that redirect
// to the same URL to be preloaded.
void AddPreload(const GURL& url, const std::vector<GURL>& alias_urls);
// For a given TabContents that wants to navigate to the URL supplied,
// determines whether a preloaded version of the URL can be used,
// and substitutes the prerendered RVH into the TabContents. Returns
// whether or not a prerendered RVH could be used or not.
bool MaybeUsePreloadedPage(TabContents* tc, const GURL& url);
// Allows PrerenderContents to remove itself when prerendering should
// be cancelled. Also deletes the entry.
void RemoveEntry(PrerenderContents* entry);
// Retrieves the PrerenderContents object for the specified URL, if it
// has been prerendered. The caller will then have ownership of the
// PrerenderContents object and is responsible for freeing it.
// Returns NULL if the specified URL has not been prerendered.
PrerenderContents* GetEntry(const GURL& url);
base::TimeDelta max_prerender_age() const { return max_prerender_age_; }
void set_max_prerender_age(base::TimeDelta td) { max_prerender_age_ = td; }
unsigned int max_elements() const { return max_elements_; }
void set_max_elements(unsigned int num) { max_elements_ = num; }
protected:
virtual ~PrerenderManager();
private:
friend class base::RefCounted<PrerenderManager>;
struct PrerenderContentsData;
bool IsPrerenderElementFresh(const base::Time start) const;
void DeleteOldEntries();
virtual base::Time GetCurrentTime() const;
virtual PrerenderContents* CreatePrerenderContents(
const GURL& url,
const std::vector<GURL>& alias_urls);
Profile* profile_;
base::TimeDelta max_prerender_age_;
unsigned int max_elements_;
// List of prerendered elements.
std::list<PrerenderContentsData> prerender_list_;
// Default maximum permitted elements to prerender.
static const unsigned int kDefaultMaxPrerenderElements = 1;
// Default maximum age a prerendered element may have, in seconds.
static const int kDefaultMaxPrerenderAgeSeconds = 20;
DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
};
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
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