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1 /* |
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2 * Copyright (c) 2003 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: This file contains the header file of the CCbsDbImpTopicMessages class. |
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15 * |
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16 * This class represents the topic messages stored in the database. |
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17 * |
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18 */ |
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19 |
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20 |
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21 |
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22 #ifndef CCBSDBIMPTOPICMESSAGES_H |
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23 #define CCBSDBIMPTOPICMESSAGES_H |
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24 |
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25 // INCLUDES |
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26 #include <e32std.h> |
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27 #include <s32file.h> |
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28 #include "CbsCommon.h" |
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29 |
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30 // FORWARD DECLARATIONS |
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31 class CCbsDbImp; |
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32 class CCbsDbImpTopicList; |
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33 class CCbsRecEtel; |
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34 |
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35 // CLASS DECLARATION |
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36 |
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37 /** |
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38 * CCbsDbImpTopicMessages represents CB messages stored in persistent memory. |
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39 * CBS server has two files to accommodate messages: one for unsaved |
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40 * and one for saved messages. "Topic messages"-stream contains information |
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41 * on whether a message is saved or not, and what is message's stream id. |
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42 * CCbsDbImpTopicMessages determines the correct data file depending on |
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43 * message's save status. |
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44 * |
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45 * Changes are written to stores immediately after operations. Message cache |
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46 * iMessageList contains header information of all messages in a single topic |
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47 * at once. A call to LoadCacheL() is thus made prior to any operation to |
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48 * make sure that the appropriate topic is being used. |
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49 */ |
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50 class CCbsDbImpTopicMessages : public CBase |
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51 { |
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52 public: // New functions |
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53 /** |
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54 * Creates an instance of the class. |
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55 * |
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56 * @param aTopicList Topic list database manager |
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57 * @param aFs File server session |
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58 * @return Pointer to the created instance |
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59 */ |
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60 static CCbsDbImpTopicMessages* NewL( CCbsDbImpTopicList& aTopicList, |
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61 RFs& aFs ); |
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62 |
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63 /** |
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64 * Destructor. |
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65 */ |
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66 ~CCbsDbImpTopicMessages(); |
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67 |
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68 public: |
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69 /** |
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70 * Invalidates the cache. |
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71 */ |
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72 void InvalidateCache(); |
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73 |
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74 /** |
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75 * Invalidates the cache if the cache contains messages of the topic. |
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76 * |
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77 * @param aNumber Number of the topic that is |
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78 * invalidated. |
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79 */ |
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80 void InvalidateCacheIfTopic( const TCbsDbTopicNumber& aNumber ); |
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81 |
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82 /** |
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83 * Creates a default topic messages stream. |
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84 * |
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85 * @param aStore Store to which the stream is created. |
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86 * @return Stream identifier to the created stream |
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87 */ |
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88 static TStreamId CreateDefaultTopicMessagesStreamL( |
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89 CStreamStore& aStore ); |
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90 |
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91 /** |
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92 * Delete all topics messages. |
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93 * |
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94 * @param aSavedStore Store which contains saved messages. |
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95 * @param aUnsavedStore Store which contains unsaved messages. |
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96 * @param aIn Stream for topic messages. |
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97 */ |
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98 static void DeleteAllTopicMessagesL( CStreamStore& aSavedStore, |
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99 CStreamStore& aUnsavedStore, RReadStream& aIn ); |
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100 |
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101 /** |
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102 * Determines whether or not there are any locked messages in |
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103 * the topic. |
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104 * |
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105 * @param aNumber Number of the topic. |
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106 * @return Boolean value indicating if there are |
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107 * locked messages in topic. |
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108 */ |
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109 TBool IsLockedMessagesInTopic( const TCbsDbTopicNumber& aNumber ) |
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110 const; |
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111 |
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112 /** |
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113 * Determines whether there is at least one locked message. |
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114 * |
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115 * @return ETrue, if there's at least one locked |
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116 * message. |
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117 */ |
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118 TBool IsLockedMessages() const; |
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119 |
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120 /** |
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121 * Returns the total amount of messages the topic contains. |
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122 * |
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123 * @param aNumber Number of the topic. |
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124 * @param aCount Returns: number of messages in given |
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125 * topic |
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126 */ |
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127 void GetMessageCountL( const TCbsDbTopicNumber& aNumber, |
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128 TInt& aCount ); |
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129 |
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130 /** |
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131 * Returns message information. |
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132 * |
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133 * @param aNumber Number of the topic. |
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134 * @param aIndex Index to the message in topic. |
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135 * @param aMessage Returns: message information. |
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136 */ |
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137 void GetMessageL( const TCbsDbTopicNumber& aNumber, |
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138 TInt aIndex, TCbsDbMessage& aMessage ); |
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139 |
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140 /** |
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141 * Finds the message for given handle and returns it. |
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142 * |
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143 * @param aHandle Handle to the message. |
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144 * @param aMessage Returns: message information. |
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145 */ |
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146 void FindMessageByHandleL( const TCbsDbMessageHandle& aHandle, |
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147 TCbsDbMessage& aMessage ); |
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148 |
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149 /** |
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150 * Finds the message by message key. |
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151 * |
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152 * @param aNumber Number of the topic. |
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153 * @param aKey Message key to be looked for. |
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154 * @return Handle to the message, or KErrNotFound if no |
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155 * such message was found. |
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156 */ |
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157 TInt FindMessageByKeyL( TCbsDbTopicNumber aNumber, |
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158 TCbsDbMessageKey aKey, |
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159 TCbsDbMessage& aMessage ); |
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160 |
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161 /** |
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162 * Stores the contents of the message to the buffer aContents. |
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163 * If aContents is too small to contain the whole message |
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164 * body, the message body is truncated. |
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165 * |
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166 * @param aHandle Handle to the message. |
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167 * @param aContents Returns: message body |
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168 * @param aSize Number of bytes to read |
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169 */ |
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170 void GetMessageContentsL( const TCbsDbMessageHandle& aHandle, |
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171 TPtr& aContents, TUint aSize ); |
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172 |
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173 /** |
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174 * Deletes a message from the topic. |
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175 * |
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176 * @param aHandle Handle to the message to be deleted. |
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177 * @param aReceiver Receiver. |
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178 */ |
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179 void DeleteMessageL( const TCbsDbMessageHandle& aHandle, |
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180 const CCbsRecEtel& aReceiver ); |
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181 |
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182 /** |
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183 * Creates a new message to the topic. |
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184 * |
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185 * FFS critical level check is made prior to operation. |
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186 * |
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187 * @param aNumber Number of the topic to which |
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188 * the message is to be added. |
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189 * @param aMessage Contains the message information |
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190 * (i.e., header, not body). |
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191 * @param aContents The contents of the message. |
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192 */ |
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193 void AddMessageL( const TCbsDbTopicNumber& aNumber, |
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194 TCbsDbMessage& aMessage, const TPtrC& aContents ); |
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195 |
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196 /** |
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197 * Saves the message. |
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198 * |
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199 * FFS critical level check is made prior to the operation. |
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200 * |
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201 * @param aHandle Handle to the message to be saved. |
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202 * @param aReceiver Receiver. |
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203 */ |
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204 void SaveMessageL( const TCbsDbMessageHandle& aHandle, |
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205 const CCbsRecEtel& aReceiver ); |
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206 |
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207 /** |
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208 * Sets the message as read. |
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209 * |
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210 * @param aHandle Handle to the message to be set read. |
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211 * @param aReceiver Receiver. |
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212 */ |
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213 void ReadMessageL( const TCbsDbMessageHandle& aHandle, |
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214 const CCbsRecEtel& aReceiver ); |
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215 |
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216 /** |
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217 * Updates handles of messages in the topic with the number given in |
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218 * aOldTopicNumber to match new topic number. |
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219 * |
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220 * @param aOldTopicNumber Number of topic to be changed |
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221 * @param aNewTopicNumber Change handles to match this number |
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222 */ |
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223 void UpdateHandlesOfTopicMessagesL( |
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224 const TCbsDbTopicNumber& aOldTopicNumber, |
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225 const TCbsDbTopicNumber& aNewTopicNumber ); |
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226 |
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227 /** |
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228 * Unlocks one message and then locks another message. |
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229 * |
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230 * Message that is locked can not be removed. Topic that |
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231 * contains a locked message can not be removed. |
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232 * |
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233 * Note that locking status is not persistent in the sense that |
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234 * when the power is switched off and turned on, no messages |
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235 * are automatically locked. |
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236 * |
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237 * @param aUnlock Handle to the message to be unlocked. |
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238 * @param aLock Handle to the message to be locked. |
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239 */ |
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240 void LockMessageL( const TCbsDbMessageHandle& aUnlock, |
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241 const TCbsDbMessageHandle& aLock ); |
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242 |
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243 /** |
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244 * Retrieves handles of messages that precede and succeed the message |
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245 * with handle aCurrentMsg. |
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246 */ |
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247 void GetNextAndPrevMsgHandleL( |
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248 const TCbsDbMessageHandle& aCurrentMsg, |
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249 TCbsDbMessageHandle& aNextMsg, |
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250 TCbsDbMessageHandle& aPrevMsg, |
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251 TInt& aPosition); |
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252 |
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253 /** |
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254 * Finds message position by message handle. |
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255 * |
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256 * The method leaves in case the message is not found. |
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257 * |
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258 * @param aHandle Handle to the message to be looked for. |
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259 * @return The position of the message. |
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260 */ |
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261 TInt FindMessagePositionByHandleL( |
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262 const TCbsDbMessageHandle& aMessage ); |
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263 |
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264 private: |
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265 |
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266 // The structure that represents the topic messages cache item. |
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267 struct TCbsDbImpTopicMessagesCacheItem |
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268 { |
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269 // The stream identifier for the message information. |
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270 TStreamId iId; |
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271 |
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272 // Whether this message is saved or not |
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273 TBool iIsSaved; |
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274 |
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275 // Indicates whether iMessage and iContentsId are valid. |
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276 TBool iIsMessage; |
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277 |
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278 // Message header - valid only if iIsMessage is true. |
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279 TCbsDbMessage iMessage; |
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280 |
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281 // Stream identifier for message body-valid if iIsMessage is ETrue |
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282 TStreamId iContentsId; |
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283 }; |
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284 |
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285 typedef CArrayFixFlat< TCbsDbImpTopicMessagesCacheItem > |
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286 TCbsDbImpTopicMessagesCache; |
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287 |
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288 /** |
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289 * Constructor. |
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290 * |
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291 * @param aTopicList Topic list database object |
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292 * @param aFs File server session |
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293 */ |
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294 CCbsDbImpTopicMessages( CCbsDbImpTopicList& aTopicList, RFs& aFs ); |
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295 |
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296 /** |
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297 * Finalizes the construction. |
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298 */ |
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299 void ConstructL(); |
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300 |
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301 /** |
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302 * Adds a message. |
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303 * |
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304 * @param aMessage Contains the message information. |
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305 * @param aContents Contains the message contents. |
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306 */ |
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307 void DoAddMessageL( TCbsDbMessage& aMessage, const TDesC& aContents ); |
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308 |
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309 /** |
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310 * Deletes a message. |
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311 * |
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312 * @param aPosition Position in the internal array where |
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313 * the message is. |
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314 */ |
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315 void DoDeleteMessageL( TInt aPosition ); |
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316 |
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317 /** |
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318 * Updates message information. |
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319 * |
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320 * @param aId Stream id to which the information is |
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321 * written. |
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322 * @param aMessage Contains the message information. |
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323 * @param aContentsId Contains the contents id. |
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324 */ |
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325 void DoUpdateMessageL( const TStreamId& aId, |
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326 const TCbsDbMessage& aMessage, const TStreamId& aContentsId ) const; |
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327 |
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328 /** |
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329 * Sets the message read. |
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330 * |
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331 * @param aId Stream id to which the information is |
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332 * written. |
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333 * @param aMessage Contains the message information. |
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334 * @param aContentsId Stream idenfitier to the contents. |
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335 */ |
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336 void DoReadMessageL( const TStreamId& aId, const TCbsDbMessage& aMessage, |
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337 const TStreamId& aContentsId ); |
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338 |
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339 /** |
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340 * Deletes messages that are not supposed to be in the topic. |
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341 * |
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342 * Because of message locking it is possible that there are more |
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343 * received messages than there should be. This method tries to |
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344 * delete this kind of message. |
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345 */ |
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346 void DoDeleteL(); |
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347 |
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348 /** |
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349 * Loads the cache, if it is not already loaded with this topic |
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350 * information. |
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351 * |
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352 * The method does not load any message information to the cache |
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353 * - only what is really necessary. |
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354 * |
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355 * @param aNumber Number of the topic to be loaded |
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356 * to the cache. |
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357 */ |
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358 void LoadCacheL( const TCbsDbTopicNumber& aNumber ); |
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359 |
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360 /** |
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361 * Loads the message header to the cache. |
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362 * |
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363 * Note that it is assumed that the index is in proper range! |
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364 * And the cache is already loaded! |
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365 * |
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366 * @param aIndex The index to the message in cache. |
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367 * @param aMessage Returns: message information. |
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368 */ |
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369 void LoadMessageL( TInt aIndex, TCbsDbMessage& aMessage ); |
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370 |
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371 /** |
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372 * Loads message contents (as much as it fits). |
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373 * |
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374 * Save status of message is required because saved and unsaved |
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375 * messages are stored on separate files. |
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376 * |
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377 * @param aContentsId Stream identifier to the content. |
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378 * @param aContents Returns: message body. |
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379 * @param aIsSaved ETrue, if the message is saved. |
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380 * @param aSize Size of the message. |
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381 */ |
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382 void LoadMessageContentsL( const TStreamId& aContentsId, TPtr& aContents, |
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383 TBool aIsSaved, TUint aSize ) const; |
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384 |
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385 /** |
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386 * Generates a new message handle. |
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387 * |
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388 * @param aNumber Number of the topic which will contain |
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389 * the message. |
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390 * @return Returns the new message handle. |
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391 */ |
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392 TCbsDbMessageHandle GenerateNewMessageHandle( |
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393 const TCbsDbTopicNumber& aNumber ); |
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394 |
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395 /** |
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396 * Checks that if there are too many received messages in |
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397 * the internal cache, then they will be deleted if they |
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398 * are not locked. |
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399 * |
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400 * @return Boolean value indicating if some |
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401 * changes was made. |
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402 */ |
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403 TBool DeleteReceivedIfNecessaryL(); |
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404 |
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405 /** |
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406 * Deletes message by its position in the internal cache. |
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407 * |
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408 * Note that after the call the internal cache won't contain |
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409 * the item. |
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410 * |
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411 * @param aPosition The position to the message. |
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412 */ |
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413 void DeleteMessageByPositionL( TInt index ); |
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414 |
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415 /** |
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416 * Determines whether or not the message is locked. |
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417 * |
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418 * @param aHandle The handle to the message. |
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419 * @return Boolean value indicating if |
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420 * the message is locked. |
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421 */ |
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422 TBool IsMessageLocked( const TCbsDbMessageHandle& aHandle ) const; |
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423 |
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424 /** |
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425 * Deletes from the locked messages. |
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426 * |
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427 * @param aHandle Message to be unlocked. |
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428 */ |
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429 void DeleteFromLocked( const TCbsDbMessageHandle& aHandle ); |
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430 |
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431 /** |
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432 * Adds a handle to the locked messages. |
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433 * |
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434 * @param aHandle Message to be locked. |
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435 */ |
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436 void InsertToLockedL( const TCbsDbMessageHandle& aHandle ); |
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437 |
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438 /** |
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439 * Updates topic messages stream from the internal cache. |
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440 * |
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441 * @param aDeleting Whether the call is due to a deletion. |
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442 */ |
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443 void UpdateTopicMessagesStreamL( TBool aDeleting ); |
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444 |
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445 /** |
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446 * Writes topic messages stream from the internal cache. |
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447 * |
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448 * @param aOut Stream to which data is written. |
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449 */ |
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450 void WriteTopicMessagesStreamL( RWriteStream& aOut ); |
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451 |
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452 /** |
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453 * Saves the message. |
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454 * |
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455 * @param aMessage The message to be saved. |
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456 * @param aItem The cache item to the previous instance of the |
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457 * message. |
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458 * @param aContentPtr The contents of the message. |
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459 * @param aPosition The position of the message in the cache. |
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460 */ |
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461 void DoSaveMessageL( |
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462 TCbsDbMessage& aMessage, |
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463 const TCbsDbImpTopicMessagesCacheItem& aItem, |
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464 const TDesC& aContentPtr, |
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465 TInt aPosition ); |
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466 |
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467 /** |
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468 * Reverts any not commited file operation in data files, |
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469 * reloads cache and then leaves with aReason. |
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470 * |
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471 * @param aReason Leave code |
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472 */ |
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473 void RevertFileOperationL( TInt aReason ); |
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474 |
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475 /** |
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476 * Creates a new message content stream. |
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477 * |
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478 * @param aStore Store to which the stream is created. |
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479 * @param aContents Message content. |
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480 */ |
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481 static TStreamId CreateMessageContentsStreamL( CStreamStore& aStore, |
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482 const TDesC& aContents ); |
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483 |
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484 /** |
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485 * Creates a new message stream. |
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486 * |
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487 * @param aStore Store to which the stream is created. |
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488 * @param aMessage Message information. |
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489 * @param aContents Stream identifier to the contents. |
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490 */ |
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491 static TStreamId CreateMessageStreamL( CStreamStore& aStore, |
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492 TCbsDbMessage& aMessage, const TStreamId& aContents ); |
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493 |
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494 /** |
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495 * Reads all cache items for a topic. |
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496 * |
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497 * @param aStore Reference to the store. |
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498 * @param aId Stream id to the topic messages stream. |
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499 * @param aCache Empty cache where it is supposed that |
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500 * these messages are put. |
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501 * @param aSpace Contain the amount of space for |
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502 * messages. |
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503 */ |
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504 static void ReadTopicMessagesCacheItemsL( const CStreamStore& aStore, |
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505 const TStreamId& aId, |
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506 TCbsDbImpTopicMessagesCache& aCache, |
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507 TInt& aSpace ); |
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508 |
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509 /** |
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510 * Reads necessary message information from the store. |
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511 * |
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512 * @param aStore Store that contains the information. |
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513 * @param aId Stream identifier to the message |
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514 * stream. |
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515 * @param aMessage Contain message information. |
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516 * @param aContentsId Contain the stream identifier to |
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517 * the contents. |
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518 */ |
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519 static void ReadMessageInformationL( |
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520 const CStreamStore& aStore, |
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521 const TStreamId& aId, |
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522 TCbsDbMessage& aMessage, |
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523 TStreamId& aContentsId ); |
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524 |
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525 /** |
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526 * Writes message information to the store. |
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527 * |
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528 * @param aOut Stream to which data is written. |
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529 * @param aMessage Contains the message information to be |
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530 * written. |
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531 * @param aContentsId Stream identifier to the contents. |
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532 */ |
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533 static void WriteMessageInformationL( RWriteStream& aOut, |
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534 const TCbsDbMessage& aMessage, const TStreamId& aContentsId ); |
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535 |
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536 /** |
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537 * Updates the soft notification (dialog) when unread message |
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538 * count changes. |
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539 * |
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540 * @param aHandle Handle to the message to be set as read |
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541 * @param aReceiver Receiver. |
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542 */ |
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543 void UpdateSoftNotificationL( const TCbsDbMessageHandle& aHandle, |
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544 const CCbsRecEtel& aReceiver ); |
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545 |
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546 private: |
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547 |
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548 // Topic list manager. |
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549 CCbsDbImpTopicList& iTopicList; |
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550 |
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551 // Indicates whether the cache is valid or not. |
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552 TBool iCacheValid; |
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553 |
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554 // If cache is valid, then it contains the topic handle of the |
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555 // cached topic. |
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556 TCbsDbTopicNumber iCachedTopicNumber; |
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557 |
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558 // If cache is valid, then it tells how many messages the stream |
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559 // can hold. |
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560 TInt iSpaceForMessages; |
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561 |
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562 // Own: If cache is valid, it contains some information of the |
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563 // topic messages for fast access. |
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564 TCbsDbImpTopicMessagesCache* iMessageList; |
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565 |
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566 // Own: handles of the locked messages. |
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567 CArrayFixFlat< TCbsDbMessageHandle >* iLockedMessages; |
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568 |
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569 // Reference to a file server session of CCbsDbImp |
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570 RFs& iFs; |
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571 |
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572 }; |
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573 |
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574 #endif // CCBSDBIMPTOPICMESSAGES_H |
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575 |
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576 // End of File |