author | Pat Downey <patrick.downey@nokia.com> |
Fri, 03 Jul 2009 15:54:40 +0100 | |
changeset 13 | 10e98eab6f85 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
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/* |
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Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de) |
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Copyright (C) 2001 Dirk Mueller <mueller@kde.org> |
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Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com) |
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Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. |
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|
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Library General Public |
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License as published by the Free Software Foundation; either |
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version 2 of the License, or (at your option) any later version. |
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|
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Library General Public License for more details. |
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You should have received a copy of the GNU Library General Public License |
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along with this library; see the file COPYING.LIB. If not, write to |
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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Boston, MA 02110-1301, USA. |
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*/ |
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#ifndef CachedResource_h |
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#define CachedResource_h |
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#include "PlatformString.h" |
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#include "ResourceResponse.h" |
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#include "SharedBuffer.h" |
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#include <wtf/HashCountedSet.h> |
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#include <wtf/Vector.h> |
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#include <time.h> |
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namespace WebCore { |
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class Cache; |
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class CachedResourceClient; |
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class CacheHandleBase; |
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class DocLoader; |
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class Request; |
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// A resource that is held in the cache. Classes who want to use this object should derive |
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// from CachedResourceClient, to get the function calls in case the requested data has arrived. |
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// This class also does the actual communication with the loader to obtain the resource from the network. |
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class CachedResource { |
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friend class Cache; |
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public: |
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enum Type { |
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ImageResource, |
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CSSStyleSheet, |
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Script |
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#if ENABLE(XSLT) |
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, XSLStyleSheet |
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#endif |
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#if ENABLE(XBL) |
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, XBL |
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#endif |
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}; |
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enum Status { |
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NotCached, // this URL is not cached |
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Unknown, // let cache decide what to do with it |
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New, // inserting new item |
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Pending, // only partially loaded |
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Cached // regular case |
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}; |
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CachedResource(const String& URL, Type); |
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virtual ~CachedResource(); |
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virtual void load(DocLoader* docLoader) { load(docLoader, false, false, true); } |
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void load(DocLoader*, bool incremental, bool skipCanLoadCheck, bool sendResourceLoadCallbacks); |
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virtual void setEncoding(const String&) { } |
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virtual void data(PassRefPtr<SharedBuffer> data, bool allDataReceived) = 0; |
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virtual void error() = 0; |
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const String &url() const { return m_url; } |
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Type type() const { return m_type; } |
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virtual void ref(CachedResourceClient*); |
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void deref(CachedResourceClient*); |
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bool referenced() const { return !m_clients.isEmpty(); } |
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#if PRELOAD_SCANNER_ENABLED |
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enum PreloadResult { |
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PreloadNotReferenced, |
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PreloadReferenced, |
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PreloadReferencedWhileLoading, |
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PreloadReferencedWhileComplete |
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}; |
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PreloadResult preloadResult() const { return m_preloadResult; } |
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void setRequestedFromNetworkingLayer() { m_requestedFromNetworkingLayer = true; } |
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#endif |
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virtual void allReferencesRemoved() {} |
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unsigned count() const { return m_clients.size(); } |
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Status status() const { return m_status; } |
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unsigned size() const { return encodedSize() + decodedSize(); } |
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unsigned encodedSize() const { return m_encodedSize; } |
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unsigned decodedSize() const { return m_decodedSize; } |
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bool isLoaded() const { return !m_loading; } |
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void setLoading(bool b) { m_loading = b; } |
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virtual bool isImage() const { return false; } |
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unsigned accessCount() const { return m_accessCount; } |
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void increaseAccessCount() { m_accessCount++; } |
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// Computes the status of an object after loading. |
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// Updates the expire date on the cache entry file |
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void finish(); |
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// Called by the cache if the object has been removed from the cache |
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// while still being referenced. This means the object should delete itself |
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// if the number of clients observing it ever drops to 0. |
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void setInCache(bool b) { m_inCache = b; } |
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bool inCache() const { return m_inCache; } |
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void setInLiveDecodedResourcesList(bool b) { m_inLiveDecodedResourcesList = b; } |
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bool inLiveDecodedResourcesList() { return m_inLiveDecodedResourcesList; } |
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void setRequest(Request*); |
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SharedBuffer* data() const { return m_data.get(); } |
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void setResponse(const ResourceResponse& response) { m_response = response; } |
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const ResourceResponse& response() const { return m_response; } |
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#if PRELOAD_SCANNER_ENABLED |
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bool canDelete() const { return !referenced() && !m_request && !m_preloadCount; } |
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#else |
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bool canDelete() const { return !referenced() && !m_request; } |
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#endif |
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bool isExpired() const; |
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virtual bool schedule() const { return false; } |
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// List of acceptable MIME types seperated by ",". |
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// A MIME type may contain a wildcard, e.g. "text/*". |
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String accept() const { return m_accept; } |
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void setAccept(const String& accept) { m_accept = accept; } |
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bool errorOccurred() const { return m_errorOccurred; } |
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bool treatAsLocal() const { return m_shouldTreatAsLocal; } |
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bool sendResourceLoadCallbacks() const { return m_sendResourceLoadCallbacks; } |
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13 | 150 |
virtual void destroyDecodedData() {} |
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void setDocLoader(DocLoader* docLoader) { m_docLoader = docLoader; } |
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#if PRELOAD_SCANNER_ENABLED |
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bool isPreloaded() const { return m_preloadCount; } |
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void increasePreloadCount() { ++m_preloadCount; } |
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void decreasePreloadCount() { ASSERT(m_preloadCount); --m_preloadCount; } |
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#endif |
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protected: |
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void setEncodedSize(unsigned); |
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void setDecodedSize(unsigned); |
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void didAccessDecodedData(double timeStamp); |
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HashCountedSet<CachedResourceClient*> m_clients; |
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String m_url; |
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String m_accept; |
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Request* m_request; |
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ResourceResponse m_response; |
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RefPtr<SharedBuffer> m_data; |
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Type m_type; |
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Status m_status; |
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bool m_errorOccurred; |
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private: |
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unsigned m_encodedSize; |
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unsigned m_decodedSize; |
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unsigned m_accessCount; |
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unsigned m_inLiveDecodedResourcesList; |
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double m_lastDecodedAccessTime; // Used as a "thrash guard" in the cache |
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bool m_sendResourceLoadCallbacks; |
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#if PRELOAD_SCANNER_ENABLED |
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unsigned m_preloadCount; |
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PreloadResult m_preloadResult; |
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bool m_requestedFromNetworkingLayer; |
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#endif |
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protected: |
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bool m_inCache; |
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bool m_loading; |
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bool m_expireDateChanged; |
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#ifndef NDEBUG |
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bool m_deleted; |
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unsigned m_lruIndex; |
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#endif |
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private: |
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CachedResource* m_nextInAllResourcesList; |
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CachedResource* m_prevInAllResourcesList; |
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CachedResource* m_nextInLiveResourcesList; |
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CachedResource* m_prevInLiveResourcesList; |
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bool m_shouldTreatAsLocal; |
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DocLoader* m_docLoader; // only non-0 for resources that are not in the cache |
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}; |
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} |
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#endif |