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| 1 /* | |
| 2 Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de) | |
| 3 Copyright (C) 2001 Dirk Mueller <mueller@kde.org> | |
| 4 Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com) | |
| 5 Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. | |
| 6 | |
| 7 This library is free software; you can redistribute it and/or | |
| 8 modify it under the terms of the GNU Library General Public | |
| 9 License as published by the Free Software Foundation; either | |
| 10 version 2 of the License, or (at your option) any later version. | |
| 11 | |
| 12 This library is distributed in the hope that it will be useful, | |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 Library General Public License for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU Library General Public License | |
| 18 along with this library; see the file COPYING.LIB. If not, write to | |
| 19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
| 20 Boston, MA 02110-1301, USA. | |
| 21 */ | |
| 22 | |
| 23 #ifndef CachedResource_h | |
| 24 #define CachedResource_h | |
| 25 | |
| 26 #include "PlatformString.h" | |
| 27 #include "ResourceResponse.h" | |
| 28 #include "SharedBuffer.h" | |
| 29 #include <wtf/HashCountedSet.h> | |
| 30 #include <wtf/Vector.h> | |
| 31 #include <time.h> | |
| 32 | |
| 33 namespace WebCore { | |
| 34 | |
| 35 class Cache; | |
| 36 class CachedResourceClient; | |
| 37 class CacheHandleBase; | |
| 38 class DocLoader; | |
| 39 class Request; | |
| 40 | |
| 41 // A resource that is held in the cache. Classes who want to use this object sho
uld derive | |
| 42 // from CachedResourceClient, to get the function calls in case the requested da
ta has arrived. | |
| 43 // This class also does the actual communication with the loader to obtain the r
esource from the network. | |
| 44 class CachedResource { | |
| 45 friend class Cache; | |
| 46 | |
| 47 public: | |
| 48 enum Type { | |
| 49 ImageResource, | |
| 50 CSSStyleSheet, | |
| 51 Script, | |
| 52 FontResource | |
| 53 #if ENABLE(XSLT) | |
| 54 , XSLStyleSheet | |
| 55 #endif | |
| 56 #if ENABLE(XBL) | |
| 57 , XBL | |
| 58 #endif | |
| 59 }; | |
| 60 | |
| 61 enum Status { | |
| 62 NotCached, // this URL is not cached | |
| 63 Unknown, // let cache decide what to do with it | |
| 64 New, // inserting new item | |
| 65 Pending, // only partially loaded | |
| 66 Cached // regular case | |
| 67 }; | |
| 68 | |
| 69 CachedResource(const String& url, Type); | |
| 70 virtual ~CachedResource(); | |
| 71 | |
| 72 virtual void load(DocLoader* docLoader) { load(docLoader, false, false, tru
e); } | |
| 73 void load(DocLoader*, bool incremental, bool skipCanLoadCheck, bool sendReso
urceLoadCallbacks); | |
| 74 | |
| 75 virtual void setEncoding(const String&) { } | |
| 76 virtual String encoding() const { return String(); } | |
| 77 virtual void data(PassRefPtr<SharedBuffer> data, bool allDataReceived) = 0; | |
| 78 virtual void error() = 0; | |
| 79 | |
| 80 const String &url() const { return m_url; } | |
| 81 Type type() const { return m_type; } | |
| 82 | |
| 83 virtual void addClient(CachedResourceClient*); | |
| 84 void removeClient(CachedResourceClient*); | |
| 85 bool hasClients() const { return !m_clients.isEmpty(); } | |
| 86 | |
| 87 enum PreloadResult { | |
| 88 PreloadNotReferenced, | |
| 89 PreloadReferenced, | |
| 90 PreloadReferencedWhileLoading, | |
| 91 PreloadReferencedWhileComplete | |
| 92 }; | |
| 93 PreloadResult preloadResult() const { return m_preloadResult; } | |
| 94 void setRequestedFromNetworkingLayer() { m_requestedFromNetworkingLayer = tr
ue; } | |
| 95 | |
| 96 virtual void allClientsRemoved() { }; | |
| 97 | |
| 98 unsigned count() const { return m_clients.size(); } | |
| 99 | |
| 100 Status status() const { return m_status; } | |
| 101 | |
| 102 unsigned size() const { return encodedSize() + decodedSize(); } | |
| 103 unsigned encodedSize() const { return m_encodedSize; } | |
| 104 unsigned decodedSize() const { return m_decodedSize; } | |
| 105 | |
| 106 bool isLoaded() const { return !m_loading; } | |
| 107 void setLoading(bool b) { m_loading = b; } | |
| 108 | |
| 109 virtual bool isImage() const { return false; } | |
| 110 | |
| 111 unsigned accessCount() const { return m_accessCount; } | |
| 112 void increaseAccessCount() { m_accessCount++; } | |
| 113 | |
| 114 // Computes the status of an object after loading. | |
| 115 // Updates the expire date on the cache entry file | |
| 116 void finish(); | |
| 117 | |
| 118 // Called by the cache if the object has been removed from the cache | |
| 119 // while still being referenced. This means the object should delete itself | |
| 120 // if the number of clients observing it ever drops to 0. | |
| 121 void setInCache(bool b) { m_inCache = b; } | |
| 122 bool inCache() const { return m_inCache; } | |
| 123 | |
| 124 void setInLiveDecodedResourcesList(bool b) { m_inLiveDecodedResourcesList =
b; } | |
| 125 bool inLiveDecodedResourcesList() { return m_inLiveDecodedResourcesList; } | |
| 126 | |
| 127 void setRequest(Request*); | |
| 128 | |
| 129 void setResponse(const ResourceResponse& response) { m_response = response;
} | |
| 130 const ResourceResponse& response() const { return m_response; } | |
| 131 | |
| 132 bool canDelete() const { return !hasClients() && !m_request && !m_preloadCou
nt; } | |
| 133 | |
| 134 bool isExpired() const; | |
| 135 | |
| 136 virtual bool schedule() const { return false; } | |
| 137 | |
| 138 // List of acceptable MIME types seperated by ",". | |
| 139 // A MIME type may contain a wildcard, e.g. "text/*". | |
| 140 String accept() const { return m_accept; } | |
| 141 void setAccept(const String& accept) { m_accept = accept; } | |
| 142 | |
| 143 bool errorOccurred() const { return m_errorOccurred; } | |
| 144 bool sendResourceLoadCallbacks() const { return m_sendResourceLoadCallbacks;
} | |
| 145 | |
| 146 virtual void destroyDecodedData() {}; | |
| 147 | |
| 148 void setDocLoader(DocLoader* docLoader) { m_docLoader = docLoader; } | |
| 149 | |
| 150 #if PLATFORM(MAC) | |
| 151 SharedBuffer* data() const { return m_data.get(); } | |
| 152 #endif | |
| 153 | |
| 154 bool isPreloaded() const { return m_preloadCount; } | |
| 155 void increasePreloadCount() { ++m_preloadCount; } | |
| 156 void decreasePreloadCount() { ASSERT(m_preloadCount); --m_preloadCount; } | |
| 157 | |
| 158 protected: | |
| 159 void setEncodedSize(unsigned); | |
| 160 void setDecodedSize(unsigned); | |
| 161 void didAccessDecodedData(double timeStamp); | |
| 162 | |
| 163 HashCountedSet<CachedResourceClient*> m_clients; | |
| 164 | |
| 165 String m_url; | |
| 166 String m_accept; | |
| 167 Request* m_request; | |
| 168 | |
| 169 ResourceResponse m_response; | |
| 170 RefPtr<SharedBuffer> m_data; | |
| 171 | |
| 172 Type m_type; | |
| 173 Status m_status; | |
| 174 | |
| 175 bool m_errorOccurred; | |
| 176 | |
| 177 private: | |
| 178 unsigned m_encodedSize; | |
| 179 unsigned m_decodedSize; | |
| 180 unsigned m_accessCount; | |
| 181 unsigned m_inLiveDecodedResourcesList; | |
| 182 double m_lastDecodedAccessTime; // Used as a "thrash guard" in the cache | |
| 183 | |
| 184 bool m_sendResourceLoadCallbacks; | |
| 185 | |
| 186 unsigned m_preloadCount; | |
| 187 PreloadResult m_preloadResult; | |
| 188 bool m_requestedFromNetworkingLayer; | |
| 189 | |
| 190 protected: | |
| 191 bool m_inCache; | |
| 192 bool m_loading; | |
| 193 bool m_expireDateChanged; | |
| 194 #ifndef NDEBUG | |
| 195 bool m_deleted; | |
| 196 unsigned m_lruIndex; | |
| 197 #endif | |
| 198 | |
| 199 private: | |
| 200 CachedResource* m_nextInAllResourcesList; | |
| 201 CachedResource* m_prevInAllResourcesList; | |
| 202 | |
| 203 CachedResource* m_nextInLiveResourcesList; | |
| 204 CachedResource* m_prevInLiveResourcesList; | |
| 205 | |
| 206 DocLoader* m_docLoader; // only non-0 for resources that are not in the cach
e | |
| 207 }; | |
| 208 | |
| 209 } | |
| 210 | |
| 211 #endif | |
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