Refactoring: Introduce ResouceLoaderHost interface for unloading ResourceLoader.

Source/core/loader/cache/CachedResourceLoader.h

 /*
     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 "core/loader/ResourceLoaderHost.h"
 #include "core/loader/cache/CachePolicy.h"
 #include "core/loader/cache/CachedResource.h"
 #include "core/loader/cache/CachedResourceHandle.h"
 #include "core/loader/cache/CachedResourceInitiatorInfo.h"
 #include "core/loader/cache/CachedResourceRequest.h"
 #include "core/platform/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 CachedDocument;
 class CachedFont;
 class CachedImage;
 class CachedRawResource;
 class CachedScript;
 class CachedShader;
 class CachedTextTrack;
 class CachedXSLStyleSheet;
 class Document;
 class DocumentLoader;
 class Frame;
+class FrameLoader;
 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> {
+class CachedResourceLoader : public RefCounted<CachedResourceLoader>, public ResourceLoaderHost {
     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();
+    virtual ~CachedResourceLoader();
+
+    using RefCounted<CachedResourceLoader>::ref;
+    using RefCounted<CachedResourceLoader>::deref;
 
     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&);
     CachedResourceHandle<CachedDocument> requestSVGDocument(CachedResourceRequest&);
     CachedResourceHandle<CachedXSLStyleSheet> requestXSLStyleSheet(CachedResourceRequest&);
@@ skipping 19 matching lines @@
     
     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; }
 
     DocumentLoader* documentLoader() const { return m_documentLoader; }
     void clearDocumentLoader() { m_documentLoader = 0; }
 
-    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);
     bool canAccess(CachedResource*);
 
+    // ResourceLoaderHost
+    virtual void incrementRequestCount(const CachedResource*) OVERRIDE;
+    virtual void decrementRequestCount(const CachedResource*) OVERRIDE;
+    virtual void didLoadResource(CachedResource*) OVERRIDE;
+    virtual void didFinishLoading(const CachedResource*, double finishTime, const ResourceLoaderOptions&) OVERRIDE;
+    virtual void didChangeLoadingPriority(const CachedResource*, ResourceLoadPriority) OVERRIDE;
+    virtual void didFailLoading(const CachedResource*, const ResourceError&, const ResourceLoaderOptions&) OVERRIDE;
+    virtual void willSendRequest(const CachedResource*, ResourceRequest&, const ResourceResponse& redirectResponse, const ResourceLoaderOptions&) OVERRIDE;
+    virtual void didReceiveResponse(const CachedResource*, const ResourceResponse&, const ResourceLoaderOptions&) OVERRIDE;
+    virtual void didReceiveData(const CachedResource*, const char* data, int dataLength, int encodedDataLength, const ResourceLoaderOptions&) OVERRIDE;
+    virtual void subresourceLoaderFinishedLoadingOnePart(ResourceLoader*) OVERRIDE;
+    virtual void didInitializeResourceLoader(ResourceLoader*) OVERRIDE;
+    virtual void willTerminateResourceLoader(ResourceLoader*) OVERRIDE;
+    virtual void willStartLoadingResource(ResourceRequest&) OVERRIDE;
+    virtual bool defersLoading() const OVERRIDE;
+    virtual bool isLoadedBy(ResourceLoaderHost*) const OVERRIDE;
+    virtual bool shouldRequest(CachedResource*, const ResourceRequest&, const ResourceLoaderOptions&) OVERRIDE;
+    virtual void refResourceLoaderHost() OVERRIDE;
+    virtual void derefResourceLoaderHost() OVERRIDE;
+    virtual Frame* inspectedFrame() const OVERRIDE;
+
     static const ResourceLoaderOptions& defaultCachedResourceOptions();
+private:
 
-private:
     explicit CachedResourceLoader(DocumentLoader*);
 
+    FrameLoader* frameLoader();
+
     CachedResourceHandle<CachedResource> requestResource(CachedResource::Type, CachedResourceRequest&);
     CachedResourceHandle<CachedResource> revalidateResource(const CachedResourceRequest&, CachedResource*);
     CachedResourceHandle<CachedResource> loadResource(CachedResource::Type, CachedResourceRequest&, const String& charset);
     void preCacheDataURIImage(const CachedResourceRequest&);
     void storeResourceTimingInitiatorInformation(const CachedResourceHandle<CachedResource>&, const CachedResourceRequest&);
     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;
 
@@ skipping 54 matching lines @@
             m_loader->m_allowStaleResources = m_previousState;
     }
 private:
     CachedResourceLoader* m_loader;
     bool m_previousState;
 };
 
 } // namespace WebCore
 
 #endif