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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_HANDLE_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_HANDLE_H_
#include "base/basictypes.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "chrome/browser/prerender/prerender_manager.h"
class GURL;
namespace content {
class SessionStorageNamespace;
}
namespace prerender {
class PrerenderContents;
// A class representing a running prerender to a client of the PrerenderManager.
// Methods on PrerenderManager which start prerenders return a caller-owned
// PrerenderHandle* to the client (or NULL if they are unable to start a
// prerender). Calls on the handle of a prerender that is not running at no-ops.
// Destroying a handle before a prerender starts will prevent it from ever
// starting. Destroying a handle while a prerendering is running will stop the
// prerender, without making any calls to the observer.
class PrerenderHandle : public base::NonThreadSafe,
public PrerenderContents::Observer {
public:
class Observer {
public:
// Signals that the prerender has started running.
virtual void OnPrerenderStart(PrerenderHandle* handle) = 0;
// Signals that the prerender has had its load event.
virtual void OnPrerenderStopLoading(PrerenderHandle* handle) = 0;
// Signals that the prerender has stopped running.
virtual void OnPrerenderStop(PrerenderHandle* handle) = 0;
// Signals the discovery, through redirects, of a new alias for this
// prerender.
virtual void OnPrerenderAddAlias(PrerenderHandle* handle,
const GURL& alias_url) = 0;
protected:
Observer();
virtual ~Observer();
};
// Before calling the destructor, the caller must invalidate the handle by
// calling either OnNavigateAway or OnCancel.
virtual ~PrerenderHandle();
void SetObserver(Observer* observer);
// The launcher is navigating away from the context that launched this
// prerender. The prerender will likely stay alive briefly though, in case we
// are going through a redirect chain that will target it.
void OnNavigateAway();
// The launcher has taken explicit action to remove this prerender (for
// instance, removing a link element from a document). This call invalidates
// the handle. If the prerender handle is already invalid, this call does
// nothing.
void OnCancel();
// True if this prerender is currently active.
bool IsPrerendering() const;
// True if we started a prerender, and it has finished loading.
bool IsFinishedLoading() const;
private:
friend class PrerenderManager;
explicit PrerenderHandle(PrerenderManager::PrerenderData* prerender_data);
void AdoptPrerenderDataFrom(PrerenderHandle* other_handle);
// From PrerenderContents::Observer:
virtual void OnPrerenderStart(PrerenderContents* prerender_contents) OVERRIDE;
virtual void OnPrerenderStopLoading(PrerenderContents* prerender_contents)
OVERRIDE;
virtual void OnPrerenderStop(PrerenderContents* prerender_contents) OVERRIDE;
virtual void OnPrerenderAddAlias(PrerenderContents* prerender_contents,
const GURL& alias_url) OVERRIDE;
virtual void OnPrerenderCreatedMatchCompleteReplacement(
PrerenderContents* contents, PrerenderContents* replacement) OVERRIDE;
Observer* observer_;
base::WeakPtr<PrerenderManager::PrerenderData> prerender_data_;
base::WeakPtrFactory<PrerenderHandle> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(PrerenderHandle);
};
} // namespace prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_HANDLE_H_
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