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Differences Between: [Versions 401 and 402] [Versions 401 and 403]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Backend generic code.
  19   *
  20   * @package tool_generator
  21   * @copyright 2013 The Open University
  22   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  /**
  28   * Backend generic code for all tool_generator commands.
  29   *
  30   * @abstract
  31   * @package tool_generator
  32   * @copyright 2013 The Open University
  33   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  34   */
  35  abstract class tool_generator_backend {
  36      /**
  37       * @var int Lowest (smallest) size index
  38       */
  39      const MIN_SIZE = 0;
  40      /**
  41       * @var int Highest (largest) size index
  42       */
  43      const MAX_SIZE = 5;
  44      /**
  45       * @var int Default size index
  46       */
  47      const DEFAULT_SIZE = 3;
  48  
  49      /**
  50       * @var bool True if we want a fixed dataset or false to generate random data
  51       */
  52      protected $fixeddataset;
  53  
  54      /**
  55       * @var int|bool Maximum number of bytes for file.
  56       */
  57      protected $filesizelimit;
  58  
  59      /**
  60       * @var bool True if displaying progress
  61       */
  62      protected $progress;
  63  
  64      /**
  65       * @var int Epoch time at which last dot was displayed
  66       */
  67      protected $lastdot;
  68  
  69      /**
  70       * @var int Epoch time at which last percentage was displayed
  71       */
  72      protected $lastpercentage;
  73  
  74      /**
  75       * @var int Epoch time at which current step (current set of dots) started
  76       */
  77      protected $starttime;
  78  
  79      /**
  80       * @var int Size code (index in the above arrays)
  81       */
  82      protected $size;
  83  
  84      /**
  85       * Generic generator class
  86       *
  87       * @param int $size Size as numeric index
  88       * @param bool $fixeddataset To use fixed or random data
  89       * @param int|bool $filesizelimit The max number of bytes for a generated file
  90       * @param bool $progress True if progress information should be displayed
  91       * @throws coding_exception If parameters are invalid
  92       */
  93      public function __construct($size, $fixeddataset = false, $filesizelimit = false, $progress = true) {
  94  
  95          // Check parameter.
  96          if ($size < self::MIN_SIZE || $size > self::MAX_SIZE) {
  97              throw new coding_exception('Invalid size');
  98          }
  99  
 100          // Set parameters.
 101          $this->size = $size;
 102          $this->fixeddataset = $fixeddataset;
 103          $this->filesizelimit = $filesizelimit;
 104          $this->progress = $progress;
 105      }
 106  
 107      /**
 108       * Converts a size name into the numeric constant.
 109       *
 110       * @param string $sizename Size name e.g. 'L'
 111       * @return int Numeric version
 112       * @throws coding_exception If the size name is not known
 113       */
 114      public static function size_for_name($sizename) {
 115          for ($size = self::MIN_SIZE; $size <= self::MAX_SIZE; $size++) {
 116              if ($sizename == get_string('shortsize_' . $size, 'tool_generator')) {
 117                  return $size;
 118              }
 119          }
 120          throw new coding_exception("Unknown size name '$sizename'");
 121      }
 122  
 123      /**
 124       * Displays information as part of progress.
 125       * @param string $langstring Part of langstring (after progress_)
 126       * @param mixed $a Optional lang string parameters
 127       * @param bool $leaveopen If true, doesn't close LI tag (ready for dots)
 128       */
 129      protected function log($langstring, $a = null, $leaveopen = false) {
 130          if (!$this->progress) {
 131              return;
 132          }
 133          if (CLI_SCRIPT) {
 134              echo '* ';
 135          } else {
 136              echo html_writer::start_tag('li');
 137          }
 138          echo get_string('progress_' . $langstring, 'tool_generator', $a);
 139          if (!$leaveopen) {
 140              if (CLI_SCRIPT) {
 141                  echo "\n";
 142              } else {
 143                  echo html_writer::end_tag('li');
 144              }
 145          } else {
 146              echo ': ';
 147              $this->lastdot = time();
 148              $this->lastpercentage = $this->lastdot;
 149              $this->starttime = microtime(true);
 150          }
 151      }
 152  
 153      /**
 154       * Outputs dots. There is up to one dot per second. Once a minute, it
 155       * displays a percentage.
 156       * @param int $number Number of completed items
 157       * @param int $total Total number of items to complete
 158       */
 159      protected function dot($number, $total) {
 160          if (!$this->progress) {
 161              return;
 162          }
 163          $now = time();
 164          if ($now == $this->lastdot) {
 165              return;
 166          }
 167          $this->lastdot = $now;
 168          if (CLI_SCRIPT) {
 169              echo '.';
 170          } else {
 171              echo ' . ';
 172          }
 173          if ($now - $this->lastpercentage >= 30) {
 174              echo round(100.0 * $number / $total, 1) . '%';
 175              $this->lastpercentage = $now;
 176          }
 177  
 178          // Update time limit so PHP doesn't time out.
 179          if (!CLI_SCRIPT) {
 180              core_php_time_limit::raise(120);
 181          }
 182      }
 183  
 184      /**
 185       * Ends a log string that was started using log function with $leaveopen.
 186       */
 187      protected function end_log() {
 188          if (!$this->progress) {
 189              return;
 190          }
 191          echo get_string('done', 'tool_generator', round(microtime(true) - $this->starttime, 1));
 192          if (CLI_SCRIPT) {
 193              echo "\n";
 194          } else {
 195              echo html_writer::end_tag('li');
 196          }
 197      }
 198  
 199  }