Your IP : 192.168.165.1
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Time splitting method that generates predictions X days/weeks/months after the analysable start.
*
* @package core_analytics
* @copyright 2019 David Monllao {@link http://www.davidmonllao.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_analytics\local\time_splitting;
defined('MOODLE_INTERNAL') || die();
/**
* Time splitting method that generates predictions X days/weeks/months after the analysable start.
*
* @package core_analytics
* @copyright 2019 David Monllao {@link http://www.davidmonllao.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class after_start extends \core_analytics\local\time_splitting\base implements before_now {
/**
* The period we should wait until we generate predictions for this.
*
* @param \core_analytics\analysable $analysable
* @return \DateInterval
*/
abstract protected function wait_period(\core_analytics\analysable $analysable);
/**
* Returns whether the course can be processed by this time splitting method or not.
*
* @param \core_analytics\analysable $analysable
* @return bool
*/
public function is_valid_analysable(\core_analytics\analysable $analysable) {
if (!$analysable->get_start()) {
return false;
}
$predictionstart = $this->get_prediction_interval_start($analysable);
if ($analysable->get_start() > $predictionstart) {
// We still need to wait.
return false;
}
return true;
}
/**
* This time-splitting method returns one single range, the start to two days before the end.
*
* @return array The list of ranges, each of them including 'start', 'end' and 'time'
*/
protected function define_ranges() {
$now = time();
$ranges = [
[
'start' => $this->analysable->get_start(),
'end' => $now,
'time' => $now,
]
];
return $ranges;
}
/**
* Whether to cache or not the indicator calculations.
*
* @return bool
*/
public function cache_indicator_calculations(): bool {
return false;
}
/**
* Calculates the interval start time backwards, from now.
*
* @param \core_analytics\analysable $analysable
* @return int
*/
protected function get_prediction_interval_start(\core_analytics\analysable $analysable) {
// The prediction time is always time(). We don't want to reuse the firstanalysis time
// because otherwise samples (e.g. students) which start after the analysable (e.g. course)
// start would use an incorrect analysis interval.
$predictionstart = new \DateTime('now');
$predictionstart->sub($this->wait_period($analysable));
return $predictionstart->getTimestamp();
}
}