1 /* |
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2 * Copyright (c) 2009 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: |
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15 * |
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16 */ |
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17 |
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18 #include <QObject> // Compiler flags, keep first |
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19 #ifdef Q_OS_SYMBIAN |
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20 #include <coemain.h> |
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21 #endif // Q_OS_SYMBIAN |
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22 #include "cxutils.h" |
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23 #include "cxesysutil.h" |
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24 #include "cxesettings.h" |
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25 #include "cxediskmonitor.h" |
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26 #include "cxediskmonitorprivate.h" |
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27 |
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28 |
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29 namespace |
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30 { |
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31 const int MONITORING_INTERVAL = 2*1000; // in milliseconds |
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32 const int UNKNOWN = -1; |
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33 } |
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34 |
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35 |
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36 /*! |
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37 * Constructor. |
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38 */ |
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39 CxeDiskMonitorPrivate::CxeDiskMonitorPrivate(CxeSettings &settings) |
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40 : mSettings(settings), |
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41 mTimer(), |
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42 #ifdef Q_OS_SYMBIAN |
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43 mFs(CCoeEnv::Static()->FsSession()), |
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44 mCameraDrive(CxeSysUtil::getCameraDrive(mFs)), |
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45 #endif // Q_OS_SYMBIAN |
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46 mTriggerLevelBytes(UNKNOWN), |
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47 mLatestFreeBytes(UNKNOWN) |
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48 { |
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49 CX_DEBUG_ENTER_FUNCTION(); |
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50 CX_DEBUG_EXIT_FUNCTION(); |
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51 } |
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52 |
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53 /*! |
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54 * Destructor. |
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55 */ |
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56 CxeDiskMonitorPrivate::~CxeDiskMonitorPrivate() |
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57 { |
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58 CX_DEBUG_ENTER_FUNCTION(); |
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59 stop(); |
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60 CX_DEBUG_EXIT_FUNCTION(); |
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61 } |
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62 |
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63 /*! |
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64 * Slot for checking if the available disk space is below warning trigger level. |
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65 */ |
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66 void CxeDiskMonitorPrivate::checkSpace() |
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67 { |
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68 CX_DEBUG_ENTER_FUNCTION(); |
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69 |
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70 qint64 previousFree(mLatestFreeBytes); |
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71 |
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72 // Get the current free space. |
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73 mLatestFreeBytes = free(false); |
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74 |
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75 // If space has changed during monitoring, signal it now. |
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76 if (previousFree != mLatestFreeBytes && isMonitoring()) { |
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77 CX_DEBUG(("CxeDiskMonitorPrivate - Disk space changed %d -> %d bytes", previousFree, mLatestFreeBytes)); |
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78 emit diskSpaceChanged(); |
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79 } |
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80 |
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81 // Only emit warning if trigger level is set to some positive value. |
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82 // Otherwise updating cached free space value is enough. |
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83 if (mTriggerLevelBytes != UNKNOWN && mLatestFreeBytes < mTriggerLevelBytes) { |
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84 CX_DEBUG(("[WARNING] CxeDiskMonitorPrivate - Disk space low!")); |
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85 emit diskSpaceLow(); |
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86 } |
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87 |
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88 CX_DEBUG_EXIT_FUNCTION(); |
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89 } |
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90 |
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91 /*! |
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92 * Set the warning level of free disk space. |
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93 * When free disk space falls below this limit, diskSpaceLow() signal is emitted. |
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94 * @param bytes Limit in bytes. |
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95 */ |
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96 void CxeDiskMonitorPrivate::setLowWarningLevel(qint64 bytes) |
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97 { |
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98 mTriggerLevelBytes = bytes; |
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99 } |
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100 |
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101 /*! |
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102 * Start monitoring disk space. |
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103 */ |
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104 void CxeDiskMonitorPrivate::start() |
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105 { |
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106 if (!mTimer.isActive()) { |
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107 connect(&mTimer, SIGNAL(timeout()), this, SLOT(checkSpace()), Qt::UniqueConnection); |
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108 mTimer.start(MONITORING_INTERVAL); |
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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 * Stop monitoring disk space. |
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114 */ |
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115 void CxeDiskMonitorPrivate::stop() |
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116 { |
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117 mTimer.stop(); |
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118 mLatestFreeBytes = UNKNOWN; |
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119 } |
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120 |
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121 /*! |
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122 * Is monitoring ongoing at the moment. |
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123 */ |
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124 bool CxeDiskMonitorPrivate::isMonitoring() const |
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125 { |
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126 return mTimer.isActive(); |
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127 } |
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128 |
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129 /*! |
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130 * Get free disk space for Camera use in bytes. |
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131 * @param cached Can cached value be used. |
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132 * If true (default value), value of last constant-interval-check is used (if it exists). |
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133 * If false (or there's no cached value), forced reading of free space is done now. |
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134 * This may cause significant delay compared to returning cached value. |
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135 */ |
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136 qint64 CxeDiskMonitorPrivate::free(bool cached) const |
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137 { |
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138 qint64 value(0); |
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139 if (cached && mLatestFreeBytes != UNKNOWN) { |
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140 value = mLatestFreeBytes; |
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141 } else { |
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142 value = CxeSysUtil::spaceAvailable(mFs, mCameraDrive, mSettings); |
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143 } |
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144 return value; |
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145 } |
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146 |
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147 // end of file |
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