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/*
Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
This class provides all functionality needed for loading images, style sheets and html
pages from the web. It has a memory cache for these objects.
*/
#ifndef CachedResourceLoader_h
#define CachedResourceLoader_h
#include "CachePolicy.h"
#include "CachedResource.h"
#include "CachedResourceHandle.h"
#include "CachedResourceRequest.h"
#include "ResourceLoadPriority.h"
#include "Timer.h"
#include <wtf/Deque.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/ListHashSet.h>
#include <wtf/text/StringHash.h>
namespace WebCore {
class CachedCSSStyleSheet;
class CachedSVGDocument;
class CachedFont;
class CachedImage;
class CachedRawResource;
class CachedScript;
class CachedShader;
class CachedTextTrack;
class CachedXSLStyleSheet;
class Document;
class DocumentLoader;
class Frame;
class ImageLoader;
class KURL;
// The CachedResourceLoader provides a per-context interface to the MemoryCache
// and enforces a bunch of security checks and rules for resource revalidation.
// Its lifetime is roughly per-DocumentLoader, in that it is generally created
// in the DocumentLoader constructor and loses its ability to generate network
// requests when the DocumentLoader is destroyed. Documents also hold a
// RefPtr<CachedResourceLoader> for their lifetime (and will create one if they
// are initialized without a Frame), so a Document can keep a CachedResourceLoader
// alive past detach if scripts still reference the Document.
class CachedResourceLoader : public RefCounted<CachedResourceLoader> {
WTF_MAKE_NONCOPYABLE(CachedResourceLoader); WTF_MAKE_FAST_ALLOCATED;
friend class ImageLoader;
friend class ResourceCacheValidationSuppressor;
public:
static PassRefPtr<CachedResourceLoader> create(DocumentLoader* documentLoader) { return adoptRef(new CachedResourceLoader(documentLoader)); }
~CachedResourceLoader();
CachedResourceHandle<CachedImage> requestImage(CachedResourceRequest&);
CachedResourceHandle<CachedCSSStyleSheet> requestCSSStyleSheet(CachedResourceRequest&);
CachedResourceHandle<CachedCSSStyleSheet> requestUserCSSStyleSheet(CachedResourceRequest&);
CachedResourceHandle<CachedScript> requestScript(CachedResourceRequest&);
CachedResourceHandle<CachedFont> requestFont(CachedResourceRequest&);
CachedResourceHandle<CachedRawResource> requestRawResource(CachedResourceRequest&);
CachedResourceHandle<CachedRawResource> requestMainResource(CachedResourceRequest&);
#if ENABLE(SVG)
CachedResourceHandle<CachedSVGDocument> requestSVGDocument(CachedResourceRequest&);
#endif
#if ENABLE(XSLT)
CachedResourceHandle<CachedXSLStyleSheet> requestXSLStyleSheet(CachedResourceRequest&);
#endif
#if ENABLE(LINK_PREFETCH)
CachedResourceHandle<CachedResource> requestLinkResource(CachedResource::Type, CachedResourceRequest&);
#endif
#if ENABLE(VIDEO_TRACK)
CachedResourceHandle<CachedTextTrack> requestTextTrack(CachedResourceRequest&);
#endif
#if ENABLE(CSS_SHADERS)
CachedResourceHandle<CachedShader> requestShader(CachedResourceRequest&);
#endif
// Logs an access denied message to the console for the specified URL.
void printAccessDeniedMessage(const KURL& url) const;
CachedResource* cachedResource(const String& url) const;
CachedResource* cachedResource(const KURL& url) const;
typedef HashMap<String, CachedResourceHandle<CachedResource> > DocumentResourceMap;
const DocumentResourceMap& allCachedResources() const { return m_documentResources; }
bool autoLoadImages() const { return m_autoLoadImages; }
void setAutoLoadImages(bool);
void setImagesEnabled(bool);
bool shouldDeferImageLoad(const KURL&) const;
CachePolicy cachePolicy(CachedResource::Type) const;
Frame* frame() const; // Can be null
Document* document() const { return m_document; } // Can be null
void setDocument(Document* document) { m_document = document; }
void clearDocumentLoader() { m_documentLoader = 0; }
void removeCachedResource(CachedResource*) const;
void loadDone(CachedResource*);
void garbageCollectDocumentResources();
void incrementRequestCount(const CachedResource*);
void decrementRequestCount(const CachedResource*);
int requestCount() const { return m_requestCount; }
bool isPreloaded(const String& urlString) const;
void clearPreloads();
void clearPendingPreloads();
void preload(CachedResource::Type, CachedResourceRequest&, const String& charset);
void checkForPendingPreloads();
void printPreloadStats();
bool canRequest(CachedResource::Type, const KURL&, const ResourceLoaderOptions&, bool forPreload = false);
static const ResourceLoaderOptions& defaultCachedResourceOptions();
private:
explicit CachedResourceLoader(DocumentLoader*);
CachedResourceHandle<CachedResource> requestResource(CachedResource::Type, CachedResourceRequest&);
CachedResourceHandle<CachedResource> revalidateResource(const CachedResourceRequest&, CachedResource*);
CachedResourceHandle<CachedResource> loadResource(CachedResource::Type, CachedResourceRequest&, const String& charset);
#if ENABLE(RESOURCE_TIMING)
void storeResourceTimingInitiatorInformation(const CachedResourceHandle<CachedResource>&, const CachedResourceRequest&);
#endif
void requestPreload(CachedResource::Type, CachedResourceRequest&, const String& charset);
enum RevalidationPolicy { Use, Revalidate, Reload, Load };
RevalidationPolicy determineRevalidationPolicy(CachedResource::Type, ResourceRequest&, bool forPreload, CachedResource* existingResource, CachedResourceRequest::DeferOption) const;
bool shouldContinueAfterNotifyingLoadedFromMemoryCache(CachedResource*);
bool checkInsecureContent(CachedResource::Type, const KURL&) const;
void garbageCollectDocumentResourcesTimerFired(Timer<CachedResourceLoader>*);
void performPostLoadActions();
bool clientDefersImage(const KURL&) const;
void reloadImagesIfNotDeferred();
HashSet<String> m_validatedURLs;
mutable DocumentResourceMap m_documentResources;
Document* m_document;
DocumentLoader* m_documentLoader;
int m_requestCount;
OwnPtr<ListHashSet<CachedResource*> > m_preloads;
struct PendingPreload {
CachedResource::Type m_type;
CachedResourceRequest m_request;
String m_charset;
};
Deque<PendingPreload> m_pendingPreloads;
Timer<CachedResourceLoader> m_garbageCollectDocumentResourcesTimer;
#if ENABLE(RESOURCE_TIMING)
struct InitiatorInfo {
AtomicString name;
double startTime;
};
HashMap<CachedResource*, InitiatorInfo> m_initiatorMap;
#endif
// 29 bits left
bool m_autoLoadImages : 1;
bool m_imagesEnabled : 1;
bool m_allowStaleResources : 1;
};
class ResourceCacheValidationSuppressor {
WTF_MAKE_NONCOPYABLE(ResourceCacheValidationSuppressor);
WTF_MAKE_FAST_ALLOCATED;
public:
ResourceCacheValidationSuppressor(CachedResourceLoader* loader)
: m_loader(loader)
, m_previousState(false)
{
if (m_loader) {
m_previousState = m_loader->m_allowStaleResources;
m_loader->m_allowStaleResources = true;
}
}
~ResourceCacheValidationSuppressor()
{
if (m_loader)
m_loader->m_allowStaleResources = m_previousState;
}
private:
CachedResourceLoader* m_loader;
bool m_previousState;
};
} // namespace WebCore
#endif
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