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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 Apple Computer, Inc.
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 "CachedResource.h"
#include "CachedResourceHandle.h"
#include "CachePolicy.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 CachedFont;
class CachedImage;
class CachedResourceRequest;
class CachedScript;
class CachedXSLStyleSheet;
class Document;
class Frame;
class ImageLoader;
class KURL;
// The CachedResourceLoader manages the loading of scripts/images/stylesheets for a single document.
class CachedResourceLoader {
WTF_MAKE_NONCOPYABLE(CachedResourceLoader); WTF_MAKE_FAST_ALLOCATED;
friend class ImageLoader;
public:
CachedResourceLoader(Document*);
~CachedResourceLoader();
CachedImage* requestImage(ResourceRequest&);
CachedCSSStyleSheet* requestCSSStyleSheet(ResourceRequest&, const String& charset, ResourceLoadPriority = ResourceLoadPriorityUnresolved);
CachedCSSStyleSheet* requestUserCSSStyleSheet(ResourceRequest&, const String& charset);
CachedScript* requestScript(ResourceRequest&, const String& charset);
CachedFont* requestFont(ResourceRequest&);
#if ENABLE(XSLT)
CachedXSLStyleSheet* requestXSLStyleSheet(ResourceRequest&);
#endif
#if ENABLE(LINK_PREFETCH)
CachedResource* requestLinkResource(CachedResource::Type, ResourceRequest&, ResourceLoadPriority = ResourceLoadPriorityUnresolved);
#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);
#ifdef ANDROID_BLOCK_NETWORK_IMAGE
bool blockNetworkImage() const { return m_blockNetworkImage; }
void setBlockNetworkImage(bool);
bool shouldBlockNetworkImage(const String& url) const;
#endif
CachePolicy cachePolicy() const;
Frame* frame() const; // Can be NULL
Document* document() const { return m_document; }
void removeCachedResource(CachedResource*) const;
void load(CachedResource*, bool incremental = false, SecurityCheckPolicy = DoSecurityCheck, bool sendResourceLoadCallbacks = true);
void loadFinishing() { m_loadFinishing = true; }
void loadDone(CachedResourceRequest*);
void cancelRequests();
void setAllowStaleResources(bool allowStaleResources) { m_allowStaleResources = allowStaleResources; }
void incrementRequestCount(const CachedResource*);
void decrementRequestCount(const CachedResource*);
int requestCount();
void clearPreloads();
void clearPendingPreloads();
void preload(CachedResource::Type, ResourceRequest&, const String& charset, bool referencedFromBody);
void checkForPendingPreloads();
void printPreloadStats();
private:
CachedResource* requestResource(CachedResource::Type, ResourceRequest&, const String& charset, ResourceLoadPriority = ResourceLoadPriorityUnresolved, bool isPreload = false);
CachedResource* revalidateResource(CachedResource*, ResourceLoadPriority priority);
CachedResource* loadResource(CachedResource::Type, ResourceRequest&, const String& charset, ResourceLoadPriority);
void requestPreload(CachedResource::Type, ResourceRequest& url, const String& charset);
enum RevalidationPolicy { Use, Revalidate, Reload, Load };
RevalidationPolicy determineRevalidationPolicy(CachedResource::Type, bool forPreload, CachedResource* existingResource) const;
void notifyLoadedFromMemoryCache(CachedResource*);
bool canRequest(CachedResource::Type, const KURL&);
void loadDoneActionTimerFired(Timer<CachedResourceLoader>*);
void performPostLoadActions();
HashSet<String> m_validatedURLs;
mutable DocumentResourceMap m_documentResources;
Document* m_document;
typedef HashSet<RefPtr<CachedResourceRequest> > RequestSet;
RequestSet m_requests;
int m_requestCount;
OwnPtr<ListHashSet<CachedResource*> > m_preloads;
struct PendingPreload {
CachedResource::Type m_type;
ResourceRequest m_request;
String m_charset;
};
Deque<PendingPreload> m_pendingPreloads;
Timer<CachedResourceLoader> m_loadDoneActionTimer;
//29 bits left
bool m_autoLoadImages : 1;
bool m_loadFinishing : 1;
bool m_allowStaleResources : 1;
#ifdef ANDROID_BLOCK_NETWORK_IMAGE
bool m_blockNetworkImage : 1;
#endif
};
}
#endif
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