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1 // Copyright (c) 1999-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #ifdef SYMBIAN_ENABLE_SPLIT_HEADERS |
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17 #include "vwsinternal.h" |
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18 #include "vwsdefpartner.h" |
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19 #endif //SYMBIAN_ENABLE_SPLIT_HEADERS |
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20 #include "VWSQUEUE.H" |
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21 |
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22 |
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23 // |
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24 // CVwsEventQueue. |
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25 // |
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26 |
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27 CVwsEventQueue::CVwsEventQueue() |
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28 { |
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29 } |
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30 |
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31 #ifdef __DO_LOGGING__ |
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32 CVwsEventQueue::CVwsEventQueue(const TDesC& aName) : iQueueName(aName) |
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33 { |
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34 } |
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35 |
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36 void CVwsEventQueue::SetName(const TDesC& aName) |
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37 { |
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38 iQueueName=aName; |
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39 } |
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40 #endif |
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41 |
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42 CVwsEventQueue::~CVwsEventQueue() |
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43 { |
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44 do |
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45 { |
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46 delete Head(); |
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47 } |
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48 while (RemoveHead() == KErrNone); |
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49 } |
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50 |
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51 void CVwsEventQueue::ProcessEventL(CVwsEvent* aEvent) |
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52 { |
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53 TInt err=AddToTail(aEvent); |
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54 if(err!=KErrNone) |
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55 { |
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56 if(aEvent!=NULL) |
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57 { |
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58 delete aEvent; |
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59 aEvent=NULL; |
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60 } |
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61 User::Leave(err); |
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62 } |
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63 |
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64 if (aEvent) |
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65 { |
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66 switch (iState) |
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67 { |
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68 case EEmpty: |
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69 { |
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70 iState=EProcessing; |
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71 TRAPD(err,aEvent->ProcessEventL()); |
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72 if (err) |
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73 { |
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74 DeleteHead(); |
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75 iState=EEmpty; |
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76 } |
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77 User::LeaveIfError(err); |
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78 } |
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79 break; |
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80 case EProcessing: |
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81 // Wait until current event has finished being processed. |
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82 break; |
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83 default: |
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84 ASSERT(EFalse); |
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85 } |
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86 } |
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87 } |
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88 |
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89 void CVwsEventQueue::HandleEventProcessed() |
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90 { |
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91 if (iQueueSize==1) |
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92 { |
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93 Head()->HandleLastOnQueue(); |
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94 DeleteHead(); |
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95 LOG3(CVwsLog::ELoud,_L("Completed event at head of %S, queue empty"),&iQueueName); |
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96 iState=EEmpty; |
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97 } |
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98 else if (iQueueSize>0) |
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99 { |
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100 DeleteHead(); |
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101 LOG4(CVwsLog::ELoud,_L("Completed event at head of %S, processing next [queue size %d]"),&iQueueName,iQueueSize); |
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102 // Start processing next event in the queue. |
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103 TInt err=KErrGeneral; |
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104 while (iQueueSize>0 && err) |
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105 { |
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106 TRAP(err, Head()->ProcessEventL()); |
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107 if (err) |
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108 { |
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109 DeleteHead(); |
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110 if (0==iQueueSize) |
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111 { |
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112 iState=EEmpty; |
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113 } |
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114 } |
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115 } |
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116 } |
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117 } |
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118 |
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119 CVwsEvent* CVwsEventQueue::Head() const |
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120 { |
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121 if (iQueueSize==0) |
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122 return NULL; |
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123 |
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124 return iQueue[iQueueStart]; |
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125 } |
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126 |
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127 CVwsEvent* CVwsEventQueue::Tail() const |
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128 { |
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129 if (iQueueSize==0) |
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130 return NULL; |
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131 |
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132 return iQueue[(iQueueEnd+KQueueSize-1)%KQueueSize]; |
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133 } |
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134 |
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135 TInt CVwsEventQueue::Count() const |
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136 { |
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137 return iQueueSize; |
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138 } |
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139 |
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140 void CVwsEventQueue::DeleteHead() |
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141 { |
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142 delete Head(); |
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143 RemoveHead(); |
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144 } |
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145 |
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146 void CVwsEventQueue::HandleSessionRemoval(const TThreadId& aClientThreadId) |
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147 { |
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148 if (iQueueSize>0) |
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149 { |
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150 LOG4(CVwsLog::ELoud,_L("Session removed - handling removal in head event of %S [queue size %d]"),&iQueueName,iQueueSize); |
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151 Head()->HandleSessionRemoval(aClientThreadId); |
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152 } |
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153 } |
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154 |
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155 TInt CVwsEventQueue::AddToTail(CVwsEvent*& aEvent) |
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156 { |
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157 switch (aEvent->Type()) |
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158 { |
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159 case CVwsEvent::ENormal: |
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160 return DoAddToTail(aEvent); |
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161 case CVwsEvent::ERejectPairs: |
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162 return AddToTailIfNotPair(aEvent); |
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163 default: |
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164 ASSERT(EFalse); |
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165 return KErrGeneral; |
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166 } |
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167 } |
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168 |
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169 TInt CVwsEventQueue::RemoveHead() |
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170 { |
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171 if (iQueueSize>0) |
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172 { |
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173 iQueue[iQueueStart]=NULL; |
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174 iQueueStart=(iQueueStart+1)%KQueueSize; |
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175 iQueueSize--; |
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176 return KErrNone; |
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177 } |
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178 |
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179 return KErrUnderflow; |
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180 } |
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181 |
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182 TInt CVwsEventQueue::DoAddToTail(CVwsEvent* aEvent) |
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183 { |
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184 if (iQueueSize<KQueueSize) |
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185 { |
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186 iQueue[iQueueEnd]=aEvent; |
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187 iQueueEnd=(iQueueEnd+1)%KQueueSize; |
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188 iQueueSize++; |
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189 aEvent->HandleAddedToQueue(); |
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190 LOG4(CVwsLog::ELoud,_L("Added event to tail of %S [queue size %d]"),&iQueueName,iQueueSize); |
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191 return KErrNone; |
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192 } |
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193 |
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194 return KErrOverflow; |
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195 } |
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196 |
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197 TInt CVwsEventQueue::AddToTailIfNotPair(CVwsEvent*& aEvent) |
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198 { |
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199 if (iQueueSize==0) |
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200 { |
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201 // Nothing in queue, so safe to add. |
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202 return DoAddToTail(aEvent); |
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203 } |
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204 |
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205 // Check for type match in queue. |
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206 if (iQueueSize>2) |
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207 { |
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208 if ((Tail()->Type()==aEvent->Type()) && (At(iQueueSize-2)->Type()==aEvent->Type()) && (At(iQueueSize-3)->Type()==aEvent->Type())) |
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209 { |
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210 LOG3(CVwsLog::ENormal,_L("Discarded event - one already in %S"),&iQueueName); |
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211 delete aEvent; |
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212 aEvent=NULL; |
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213 return KErrNone; |
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214 } |
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215 } |
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216 |
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217 // No match, do add to tail. |
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218 return DoAddToTail(aEvent); |
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219 } |
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220 |
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221 CVwsEvent* CVwsEventQueue::At(TInt aIndex) |
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222 { |
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223 CVwsEvent* event=NULL; |
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224 |
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225 if (aIndex<iQueueSize) |
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226 { |
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227 event=iQueue[(iQueueStart+aIndex)%KQueueSize]; |
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228 } |
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229 |
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230 return event; |
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231 } |
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232 |
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233 void CVwsEventQueue::KickStart() |
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234 { |
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235 //Attempt to restart stalled q |
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236 DeleteHead(); |
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237 iState=EEmpty; |
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238 TInt err = KErrGeneral; |
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239 while(iQueueSize>0 && err) |
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240 { |
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241 iState=EProcessing; |
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242 TRAP(err, Head()->ProcessEventL()); |
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243 if (err) |
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244 { |
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245 DeleteHead(); |
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246 iState=EEmpty; |
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247 } |
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248 } |
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249 } |
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250 |
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251 // |
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252 // CVwsEvent. |
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253 // |
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254 |
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255 CVwsEvent::CVwsEvent(TType aType,CVwsEventQueue& aQueue) |
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256 :iType(aType),iQueue(aQueue) |
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257 { |
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258 } |
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259 |
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260 CVwsEvent::~CVwsEvent() |
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261 { |
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262 } |
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263 |
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264 CVwsEvent::TType CVwsEvent::Type() |
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265 { |
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266 return iType; |
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267 } |
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268 |
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269 void CVwsEvent::ReportEventProcessed() |
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270 { |
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271 iQueue.HandleEventProcessed(); |
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272 } |
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273 |
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274 void CVwsEvent::HandleAddedToQueue() |
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275 { |
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276 } |
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277 |
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278 void CVwsEvent::HandleLastOnQueue() |
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279 { |
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280 } |
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281 |
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282 void CVwsEvent::HandleSessionRemoval(const TThreadId& /*aClientThreadId*/) |
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283 { |
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284 } |