1 | <?php |
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2 | /*********************************************** |
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3 | * File : pingtracking.php |
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4 | * Project : Z-Push |
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5 | * Descr : |
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6 | * |
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7 | * Created : 20.10.2011 |
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8 | * |
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9 | * Copyright 2007 - 2012 Zarafa Deutschland GmbH |
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10 | * |
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11 | * This program is free software: you can redistribute it and/or modify |
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12 | * it under the terms of the GNU Affero General Public License, version 3, |
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13 | * as published by the Free Software Foundation with the following additional |
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14 | * term according to sec. 7: |
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15 | * |
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16 | * According to sec. 7 of the GNU Affero General Public License, version 3, |
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17 | * the terms of the AGPL are supplemented with the following terms: |
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18 | * |
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19 | * "Zarafa" is a registered trademark of Zarafa B.V. |
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20 | * "Z-Push" is a registered trademark of Zarafa Deutschland GmbH |
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21 | * The licensing of the Program under the AGPL does not imply a trademark license. |
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22 | * Therefore any rights, title and interest in our trademarks remain entirely with us. |
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23 | * |
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24 | * However, if you propagate an unmodified version of the Program you are |
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25 | * allowed to use the term "Z-Push" to indicate that you distribute the Program. |
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26 | * Furthermore you may use our trademarks where it is necessary to indicate |
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27 | * the intended purpose of a product or service provided you use it in accordance |
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28 | * with honest practices in industrial or commercial matters. |
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29 | * If you want to propagate modified versions of the Program under the name "Z-Push", |
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30 | * you may only do so if you have a written permission by Zarafa Deutschland GmbH |
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31 | * (to acquire a permission please contact Zarafa at trademark@zarafa.com). |
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32 | * |
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33 | * This program is distributed in the hope that it will be useful, |
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34 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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35 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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36 | * GNU Affero General Public License for more details. |
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37 | * |
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38 | * You should have received a copy of the GNU Affero General Public License |
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39 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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40 | * |
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41 | * Consult LICENSE file for details |
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42 | ************************************************/ |
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43 | |
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44 | class PingTracking extends InterProcessData { |
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45 | |
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46 | /** |
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47 | * Constructor |
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48 | * |
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49 | * @access public |
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50 | */ |
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51 | public function PingTracking() { |
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52 | // initialize super parameters |
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53 | $this->allocate = 512000; // 500 KB |
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54 | $this->type = 2; |
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55 | parent::__construct(); |
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56 | |
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57 | $this->initPing(); |
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58 | } |
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59 | |
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60 | /** |
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61 | * Destructor |
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62 | * Used to remove the current ping data from shared memory |
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63 | * |
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64 | * @access public |
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65 | */ |
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66 | public function __destruct() { |
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67 | // exclusive block |
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68 | if ($this->blockMutex()) { |
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69 | $pings = $this->getData(); |
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70 | |
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71 | // check if our ping is still in the list |
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72 | if (isset($pings[self::$devid][self::$user][self::$pid])) { |
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73 | unset($pings[self::$devid][self::$user][self::$pid]); |
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74 | $stat = $this->setData($pings); |
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75 | } |
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76 | |
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77 | $this->releaseMutex(); |
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78 | } |
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79 | // end exclusive block |
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80 | } |
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81 | |
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82 | /** |
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83 | * Initialized the current request |
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84 | * |
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85 | * @access public |
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86 | * @return boolean |
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87 | */ |
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88 | protected function initPing() { |
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89 | $stat = false; |
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90 | |
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91 | // initialize params |
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92 | $this->InitializeParams(); |
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93 | |
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94 | // exclusive block |
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95 | if ($this->blockMutex()) { |
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96 | $pings = ($this->hasData()) ? $this->getData() : array(); |
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97 | |
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98 | // set the start time for the current process |
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99 | $this->checkArrayStructure($pings); |
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100 | $pings[self::$devid][self::$user][self::$pid] = self::$start; |
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101 | $stat = $this->setData($pings); |
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102 | $this->releaseMutex(); |
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103 | } |
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104 | // end exclusive block |
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105 | |
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106 | return $stat; |
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107 | } |
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108 | |
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109 | /** |
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110 | * Checks if there are newer ping requests for the same device & user so |
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111 | * the current process could be terminated |
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112 | * |
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113 | * @access public |
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114 | * @return boolean true if the current process is obsolete |
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115 | */ |
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116 | public function DoForcePingTimeout() { |
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117 | $pings = false; |
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118 | // exclusive block |
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119 | if ($this->blockMutex()) { |
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120 | $pings = $this->getData(); |
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121 | $this->releaseMutex(); |
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122 | } |
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123 | // end exclusive block |
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124 | |
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125 | // check if there is another (and newer) active ping connection |
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126 | if (is_array($pings) && isset($pings[self::$devid][self::$user]) && count($pings[self::$devid][self::$user]) > 1) { |
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127 | foreach ($pings[self::$devid][self::$user] as $pid=>$starttime) |
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128 | if ($starttime > self::$start) |
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129 | return true; |
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130 | } |
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131 | |
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132 | return false; |
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133 | } |
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134 | |
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135 | /** |
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136 | * Builds an array structure for the concurrent ping connection detection |
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137 | * |
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138 | * @param array $array reference to the ping data array |
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139 | * |
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140 | * @access private |
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141 | * @return |
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142 | */ |
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143 | private function checkArrayStructure(&$array) { |
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144 | if (!is_array($array)) |
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145 | $array = array(); |
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146 | |
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147 | if (!isset($array[self::$devid])) |
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148 | $array[self::$devid] = array(); |
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149 | |
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150 | if (!isset($array[self::$devid][self::$user])) |
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151 | $array[self::$devid][self::$user] = array(); |
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152 | |
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153 | } |
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154 | } |
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155 | |
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156 | ?> |
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