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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_LINK_MANAGER_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_LINK_MANAGER_H_
#include <map>
#include <utility>
#include "base/basictypes.h"
#include "chrome/browser/prerender/prerender_handle.h"
#include "chrome/browser/profiles/profile_keyed_service.h"
#include "googleurl/src/gurl.h"
class Profile;
namespace content {
struct Referrer;
}
namespace gfx {
class Size;
}
namespace prerender {
class PrerenderHandle;
class PrerenderManager;
// PrerenderLinkManager implements the API on Link elements for all documents
// being rendered in this chrome instance. It receives messages from the
// renderer indicating addition, cancelation and abandonment of link elements,
// and controls the PrerenderManager accordingly.
class PrerenderLinkManager : public ProfileKeyedService,
public PrerenderHandle::Observer {
public:
explicit PrerenderLinkManager(PrerenderManager* manager);
virtual ~PrerenderLinkManager();
// A <link rel=prerender ...> element has been inserted into the document.
// The |prerender_id| must be unique per |child_id|, and is assigned by the
// WebPrerendererClient.
// Returns true if the prerender was accepted by the prerender manager,
// and false if not. In either case, the |prerender_id| is usable for
// future OnCancelPrerender and OnAbandonPrerender calls.
bool OnAddPrerender(
int child_id,
int prerender_id,
const GURL& url,
const content::Referrer& referrer,
const gfx::Size& size,
int render_view_route_id);
// A <link rel=prerender ...> element has been explicitly removed from a
// document.
void OnCancelPrerender(int child_id, int prerender_id);
// A renderer launching <link rel=prerender ...> has navigated away from the
// launching page, the launching renderer process has crashed, or perhaps the
// renderer process was fast-closed when the last render view in it was
// closed.
void OnAbandonPrerender(int child_id, int prerender_id);
// If a renderer channel closes (crash, fast exit, etc...), that's effectively
// an abandon of any prerenders launched by that child.
void OnChannelClosing(int child_id);
private:
friend class PrerenderBrowserTest;
friend class PrerenderTest;
typedef std::pair<int, int> ChildAndPrerenderIdPair;
typedef std::map<ChildAndPrerenderIdPair, PrerenderHandle*>
IdPairToPrerenderHandleMap;
void RemovePrerender(
const IdPairToPrerenderHandleMap::iterator& id_to_handle_iter);
bool IsEmpty() const;
IdPairToPrerenderHandleMap::iterator FindPrerenderHandle(
PrerenderHandle* prerender_handle);
// From PrerenderHandle::Observer:
virtual void OnPrerenderStart(PrerenderHandle* prerender_handle) OVERRIDE;
virtual void OnPrerenderStop(PrerenderHandle* prerender_handle) OVERRIDE;
virtual void OnPrerenderAddAlias(PrerenderHandle* prerender_handle,
const GURL& alias_url) OVERRIDE;
PrerenderManager* manager_;
// A map from child process id and prerender id to PrerenderHandles. We map
// from this pair because the prerender ids are only unique within their
// renderer process.
IdPairToPrerenderHandleMap ids_to_handle_map_;
DISALLOW_COPY_AND_ASSIGN(PrerenderLinkManager);
};
} // namespace prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_LINK_MANAGER_H_
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