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1 /* |
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2 * Copyright (c) 2005-2006 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: LRU priority list for the file cache |
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15 * |
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16 */ |
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17 |
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18 |
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19 #include "rsfwlruprioritylist.h" |
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20 #include "rsfwlrulistnode.h" |
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21 #include "rsfwfileentry.h" |
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22 #include "mdebug.h" |
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23 #include "rsfwvolumetable.h" |
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24 #include "rsfwvolume.h" |
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25 #include "rsfwfileengine.h" |
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26 #include "rsfwfiletable.h" |
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27 |
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28 // ---------------------------------------------------------------------------- |
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29 // CRsfwLruPriorityList::CRsfwLruPriorityList |
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30 // |
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31 // ---------------------------------------------------------------------------- |
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32 // |
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33 CRsfwLruPriorityList::CRsfwLruPriorityList() |
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34 : iHdr(CRsfwLruListNode::iOffset),iIter(iHdr) //construct header & iterator |
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35 {} |
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36 |
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37 // ---------------------------------------------------------------------------- |
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38 // CRsfwLruPriorityList::~CRsfwLruPriorityList |
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39 // |
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40 // ---------------------------------------------------------------------------- |
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41 // |
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42 CRsfwLruPriorityList::~CRsfwLruPriorityList() |
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43 { |
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44 CRsfwLruListNode* node; |
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45 |
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46 iIter.SetToFirst(); |
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47 node = iIter++; |
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48 while (node) |
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49 { |
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50 node->iLink.Deque(); |
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51 delete node; |
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52 node = iIter++; |
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53 } |
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54 } |
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55 |
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56 // ---------------------------------------------------------------------------- |
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57 // CRsfwLruPriorityList::AddNodeL |
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58 // |
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59 // ---------------------------------------------------------------------------- |
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60 // |
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61 void CRsfwLruPriorityList::AddNodeL(CRsfwFileEntry *aFe, TInt aPriority) |
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62 { |
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63 CRsfwLruListNode* currentNode; |
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64 |
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65 iIter.SetToFirst(); |
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66 |
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67 currentNode = iIter++; |
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68 while (currentNode) |
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69 { |
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70 if (currentNode->iEntryPtr->Fid() == aFe->Fid()) |
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71 { |
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72 DEBUGSTRING(("LRU list: '%d' already exists on the list", |
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73 aFe->Fid().iNodeId)); |
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74 return; |
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75 } |
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76 currentNode = iIter++; |
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77 } |
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78 |
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79 // Inserts the specified list element in descending priority order. |
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80 // If there is an existing list element with the same priority, |
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81 // then the new element is added after the existing element. |
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82 CRsfwLruListNode* newNode = CRsfwLruListNode::NewL(aFe, aPriority); |
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83 iHdr.Add(*newNode); |
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84 DEBUGSTRING(("LRU list: added fid '%d' to the list", |
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85 aFe->Fid().iNodeId)); |
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86 } |
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87 |
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88 |
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89 // ---------------------------------------------------------------------------- |
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90 // CRsfwLruPriorityList::RemoveNode |
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91 // |
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92 // ---------------------------------------------------------------------------- |
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93 // |
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94 TInt CRsfwLruPriorityList::RemoveNode(CRsfwFileEntry *aFe) |
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95 { |
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96 DEBUGSTRING(("CRsfwLruPriorityList::RemoveNode")); |
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97 // When file is opened, it must be removed from LRU list |
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98 // as it is not candidate for removal from cache. |
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99 // Returns KErrNotFound if the file is not found at all |
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100 |
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101 TInt err = KErrNotFound; |
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102 CRsfwLruListNode* currentNode; |
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103 |
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104 iIter.SetToFirst(); |
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105 |
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106 currentNode = iIter++; |
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107 while (currentNode) |
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108 { |
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109 if (currentNode->iEntryPtr->Fid() == aFe->Fid()) |
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110 { |
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111 currentNode->iLink.Deque(); |
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112 delete currentNode; |
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113 err = KErrNone; |
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114 DEBUGSTRING(("LRU list: removed fid '%d' from the list", |
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115 aFe->Fid().iNodeId)); |
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116 break; |
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117 } |
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118 currentNode = iIter++; |
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119 } |
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120 return err; |
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121 } |
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122 |
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123 // ---------------------------------------------------------------------------- |
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124 // CRsfwLruPriorityList::GetAndRemoveFirstEntry |
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125 // |
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126 // ---------------------------------------------------------------------------- |
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127 // |
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128 CRsfwFileEntry* CRsfwLruPriorityList::GetAndRemoveFirstEntry() |
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129 { |
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130 |
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131 CRsfwLruListNode* firstNode = iHdr.First(); |
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132 CRsfwFileEntry* firstEntry = NULL; |
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133 |
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134 if (iHdr.IsHead(firstNode)) |
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135 { |
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136 return NULL; // the head has been reached, and must not be removed |
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137 } |
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138 |
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139 if (firstNode) |
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140 { |
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141 firstEntry = firstNode->iEntryPtr; |
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142 firstNode->iLink.Deque(); |
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143 delete firstNode; |
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144 } |
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145 |
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146 DEBUGSTRING(("LRU list: first fid on the list removed, '%d'", |
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147 firstEntry->Fid().iNodeId)); |
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148 return firstEntry; |
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149 } |
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150 |
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151 // ---------------------------------------------------------------------------- |
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152 // CRsfwFileEntry::ExternalizeL |
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153 // ---------------------------------------------------------------------------- |
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154 // |
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155 void CRsfwLruPriorityList::ExternalizeL(RWriteStream& aStream) |
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156 { |
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157 // start from the end! |
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158 iIter.SetToLast(); |
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159 CRsfwLruListNode* currentNode = iIter--; |
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160 while (currentNode) |
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161 { |
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162 CRsfwFileEntry* currentEntry = currentNode->iEntryPtr; |
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163 if (currentEntry) |
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164 { |
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165 TFid fid = currentEntry->Fid(); |
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166 aStream.WriteInt32L(fid.iNodeId); |
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167 aStream.WriteInt32L(fid.iVolumeId); |
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168 } |
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169 currentNode = iIter--; |
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170 } |
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171 } |
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172 |
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173 // ---------------------------------------------------------------------------- |
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174 // CRsfwFileEntry::InternalizeL |
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175 // ---------------------------------------------------------------------------- |
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176 // |
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177 void CRsfwLruPriorityList::InternalizeL(RReadStream& aStream, CRsfwVolumeTable* aVolumeTable) |
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178 { |
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179 if ( !aVolumeTable ) |
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180 { |
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181 User::Leave(KErrArgument); |
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182 } |
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183 |
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184 // reset existing list |
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185 iHdr.Reset(); |
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186 |
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187 // get stream size |
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188 MStreamBuf* streamBuf = aStream.Source(); |
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189 TInt streamSize = streamBuf->SizeL(); |
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190 |
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191 TInt i; |
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192 // note i+8 as one entry takes two TInt32 (2 times 4 bytes) |
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193 for ( i = 0; i < streamSize; i = i+8 ) |
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194 { |
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195 TFid fid; |
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196 fid.iNodeId = aStream.ReadInt32L(); |
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197 fid.iVolumeId = aStream.ReadInt32L(); |
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198 |
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199 // check whether there is no trash in the data being internalized |
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200 if (fid.iVolumeId >= 0 && fid.iVolumeId < KMaxVolumes && fid.iNodeId > 0) |
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201 { |
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202 // find existing CRsfwFileEntry object based on TFid |
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203 CRsfwVolume* volume = aVolumeTable->iVolumes[fid.iVolumeId]; |
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204 if ( volume ) |
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205 { |
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206 CRsfwFileEntry* entry = volume->iFileEngine->iFileTable->Root()->Lookup(fid); |
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207 if ( entry ) |
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208 { |
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209 AddNodeL(entry, ECachePriorityNormal); |
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210 } |
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211 } |
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212 } |
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213 else |
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214 { |
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215 DEBUGSTRING(("LRU List: wrong item on the list being internalized!")); |
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216 } |
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217 } |
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218 } |
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219 |