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1 /* |
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2 * Copyright (c) 2006-2007 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: Processor object for running thumbnail requests |
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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 "thumbnailrequestqueue.h" |
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20 #include "thumbnailrequestactive.h" |
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21 #include "thumbnaillog.h" |
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22 |
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23 |
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24 // ======== MEMBER FUNCTIONS ======== |
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25 |
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26 // --------------------------------------------------------------------------- |
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27 // CThumbnailRequestQueue::NewL() |
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28 // Two-phased constructor. |
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29 // --------------------------------------------------------------------------- |
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30 // |
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31 CThumbnailRequestQueue* CThumbnailRequestQueue::NewL() |
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32 { |
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33 CThumbnailRequestQueue* self = new( ELeave )CThumbnailRequestQueue(); |
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34 CleanupStack::PushL( self ); |
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35 self->ConstructL(); |
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36 CleanupStack::Pop( self ); |
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37 return self; |
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38 } |
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39 |
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40 |
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41 // --------------------------------------------------------------------------- |
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42 // CThumbnailRequestQueue::CThumbnailRequestQueue() |
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43 // C++ default constructor can NOT contain any code, that might leave. |
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44 // --------------------------------------------------------------------------- |
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45 // |
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46 CThumbnailRequestQueue::CThumbnailRequestQueue() |
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47 { |
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48 } |
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49 |
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50 |
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51 // --------------------------------------------------------------------------- |
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52 // CThumbnailRequestQueue::ConstructL() |
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53 // Symbian 2nd phase constructor can leave. |
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54 // --------------------------------------------------------------------------- |
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55 // |
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56 void CThumbnailRequestQueue::ConstructL() |
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57 { |
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58 iActiveRequests = 0; |
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59 } |
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60 |
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61 |
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62 // --------------------------------------------------------------------------- |
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63 // CThumbnailRequestQueue::~CThumbnailRequestQueue() |
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64 // Destructor. |
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65 // --------------------------------------------------------------------------- |
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66 // |
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67 CThumbnailRequestQueue::~CThumbnailRequestQueue() |
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68 { |
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69 TN_DEBUG1( "CThumbnailRequestQueue::~CThumbnailRequestQueue()"); |
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70 |
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71 iRequests.ResetAndDestroy(); |
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72 |
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73 TN_DEBUG1( "CThumbnailRequestQueue::~CThumbnailRequestQueue() - All requests deleted"); |
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74 } |
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75 |
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76 |
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77 // --------------------------------------------------------------------------- |
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78 // CThumbnailRequestQueue::Process() |
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79 // Activates next request if possible. |
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80 // --------------------------------------------------------------------------- |
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81 // |
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82 void CThumbnailRequestQueue::Process() |
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83 { |
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84 TN_DEBUG1( "CThumbnailRequestQueue::Process()"); |
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85 |
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86 while ( (iActiveRequests < KMaxClientRequests) && |
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87 (iRequests.Count() > iActiveRequests) ) |
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88 { |
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89 CThumbnailRequestActive* selectedRequest = NULL; |
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90 TInt priority( KMinTInt ); |
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91 TInt reqPriority; |
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92 CThumbnailRequestActive* request = NULL; |
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93 |
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94 for ( TInt i = 0; i < iRequests.Count(); i++ ) |
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95 { |
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96 request = iRequests[i]; |
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97 |
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98 // this task is not yet activated or processed |
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99 if( request && !request->RequestCompleted() && !request->IsRequestActive() ) |
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100 { |
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101 TN_DEBUG4( "CThumbnailRequestQueue::Process() - candidate at %d, id = %d, (0x%08x)", i, |
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102 request->RequestId(), |
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103 request); |
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104 reqPriority = request->Priority(); |
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105 if ( reqPriority > priority ) |
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106 { |
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107 priority = reqPriority; |
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108 selectedRequest = request; |
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109 } |
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110 } |
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111 } |
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112 |
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113 // activate selected |
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114 if ( selectedRequest ) |
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115 { |
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116 TN_DEBUG1( "CThumbnailRequestQueue::Process() - starting next request"); |
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117 |
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118 TRAPD(err, selectedRequest->StartL()); |
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119 if (err != KErrNone) |
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120 { |
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121 iActiveRequests++; |
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122 } |
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123 } |
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124 else |
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125 { |
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126 break; |
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127 } |
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128 } |
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129 |
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130 TN_DEBUG3( "CThumbnailRequestQueue::Process() end - requests: %d, active requests: %d", |
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131 iRequests.Count(), iActiveRequests ); |
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132 } |
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133 |
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134 |
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135 // --------------------------------------------------------------------------- |
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136 // CThumbnailRequestQueue::AddRequestL() |
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137 // Adds new request to the queue. |
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138 // --------------------------------------------------------------------------- |
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139 // |
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140 void CThumbnailRequestQueue::AddRequestL( CThumbnailRequestActive* aRequest ) |
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141 { |
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142 TN_DEBUG3( "CThumbnailRequestQueue::AddRequestL() - requests: %d, active requests: %d", |
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143 iRequests.Count(), iActiveRequests ); |
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144 |
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145 RemoveCompleted(NULL); |
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146 iRequests.AppendL( aRequest ); |
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147 } |
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148 |
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149 void CThumbnailRequestQueue::RemoveCompleted( CThumbnailRequestActive* aRequestAO) |
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150 { |
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151 TN_DEBUG3( "CThumbnailRequestQueue::RemoveCompleted() - begin - requests: %d, active requests: %d", |
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152 iRequests.Count(), iActiveRequests ); |
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153 |
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154 //process completed queue and remove finished tasks |
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155 for ( TInt i = iRequests.Count() -1; i >= 0 && iRequests.Count(); i-- ) |
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156 { |
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157 CThumbnailRequestActive* request = iRequests[i]; |
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158 |
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159 // remove completed task if it's not active anymore and not this |
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160 if ( request->RequestCompleted() && !request->IsRequestActive() && aRequestAO != request) |
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161 { |
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162 // delete completed task |
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163 TN_DEBUG3( "CThumbnailRequestQueue::RemoveCompleted() - deleted id = %d (0x%08x)", request->RequestId(), request); |
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164 delete request; |
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165 iRequests.Remove( i ); |
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166 } |
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167 } |
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168 |
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169 TN_DEBUG3( "CThumbnailRequestQueue::RemoveCompleted() end - requests: %d, active requests: %d", |
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170 iRequests.Count(), iActiveRequests ); |
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171 } |
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172 |
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173 |
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174 // --------------------------------------------------------------------------- |
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175 // CThumbnailRequestQueue::CancelRequest() |
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176 // Removes specific request from the queue. |
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177 // --------------------------------------------------------------------------- |
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178 // |
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179 TInt CThumbnailRequestQueue::CancelRequest( const TThumbnailRequestId aRequestId ) |
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180 { |
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181 TN_DEBUG2( "CThumbnailRequestQueue::CancelRequest() - request ID: %d", aRequestId); |
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182 |
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183 TInt res = KErrNotFound; |
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184 |
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185 for ( TInt i = iRequests.Count(); --i >= 0; ) |
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186 { |
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187 CThumbnailRequestActive* request = iRequests[i]; |
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188 if ( request->RequestId() == aRequestId ) |
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189 { |
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190 // Cancel and remove from queue |
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191 if (iRequests[i]->IsActive()) |
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192 { |
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193 iRequests[i]->Cancel(); |
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194 |
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195 iActiveRequests--; |
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196 if(iActiveRequests <= -1) |
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197 { |
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198 iActiveRequests = 0; |
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199 } |
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200 |
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201 delete request; |
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202 iRequests.Remove( i ); |
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203 |
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204 TN_DEBUG2( "CThumbnailRequestQueue::CancelRequest() - canceled request ID: %d", aRequestId); |
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205 } |
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206 else |
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207 { |
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208 delete request; |
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209 iRequests.Remove( i ); |
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210 |
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211 TN_DEBUG2( "CThumbnailRequestQueue::CancelRequest() - removed request ID: %d", aRequestId); |
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212 } |
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213 |
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214 res = KErrNone; |
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215 break; |
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216 } |
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217 } |
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218 |
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219 RemoveCompleted(NULL); |
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220 |
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221 Process(); |
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222 |
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223 return res; |
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224 } |
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225 |
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226 |
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227 // --------------------------------------------------------------------------- |
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228 // CThumbnailRequestQueue::ChangeReqPriority() |
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229 // Changes priority of a request. |
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230 // --------------------------------------------------------------------------- |
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231 // |
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232 TInt CThumbnailRequestQueue::ChangePriority( const TThumbnailRequestId aRequestId, |
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233 const TInt aNewPriority ) |
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234 { |
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235 TN_DEBUG1( "CThumbnailRequestQueue::ChangePriority()"); |
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236 |
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237 TInt err = KErrNotFound; |
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238 const TInt count = iRequests.Count(); |
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239 |
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240 for ( TInt i( 0 ); i < count; i++ ) |
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241 { |
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242 if ( iRequests[i]->RequestId() == aRequestId ) |
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243 { |
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244 iRequests[i]->ChangePriority( aNewPriority ); |
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245 |
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246 err = KErrNone; |
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247 break; |
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248 } |
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249 } |
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250 |
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251 return err; |
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252 } |
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253 |
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254 |
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255 // --------------------------------------------------------------------------- |
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256 // CThumbnailRequestQueue::RequestComplete() |
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257 // Completes the request |
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258 // --------------------------------------------------------------------------- |
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259 // |
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260 void CThumbnailRequestQueue::RequestComplete(CThumbnailRequestActive* aRequestAO) |
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261 { |
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262 TN_DEBUG2( "CThumbnailRequestQueue::RequestComplete(0x%08x)", aRequestAO); |
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263 |
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264 iActiveRequests--; |
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265 if(iActiveRequests <= -1) |
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266 { |
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267 iActiveRequests = 0; |
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268 } |
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269 |
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270 RemoveCompleted( aRequestAO ); |
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271 |
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272 Process(); |
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273 |
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274 TN_DEBUG2( "CThumbnailRequestQueue::RequestComplete() end - active requests: %d", iActiveRequests ); |
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275 } |
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276 |
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277 |
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278 // End of file |