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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; under version 2 |
| 7 | * of the License (non-upgradable). |
| 8 | * |
| 9 | * This program 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 this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | * |
| 18 | * Copyright (c) 2018 (original work) Open Assessment Technologies SA; |
| 19 | */ |
| 20 | |
| 21 | namespace oat\taoProctoring\model\monitorCache\implementation; |
| 22 | |
| 23 | use Iterator; |
| 24 | use oat\taoProctoring\model\monitorCache\DeliveryMonitoringService; |
| 25 | use Zend\ServiceManager\ServiceLocatorAwareTrait; |
| 26 | use Zend\ServiceManager\ServiceLocatorInterface; |
| 27 | |
| 28 | /** |
| 29 | * Class DeliveryMonitoringIterator |
| 30 | * @package oat\taoProctoring\model\monitorCache\implementation |
| 31 | */ |
| 32 | class DeliveryMonitoringIterator implements \Iterator |
| 33 | { |
| 34 | use ServiceLocatorAwareTrait; |
| 35 | |
| 36 | public const CACHE_SIZE = 10000; |
| 37 | |
| 38 | /** |
| 39 | * Id of the current instance |
| 40 | * |
| 41 | * @var int |
| 42 | */ |
| 43 | private $currentInstance = 0; |
| 44 | |
| 45 | /** |
| 46 | * List of resource uris currently being iterated over |
| 47 | * |
| 48 | * @var array |
| 49 | */ |
| 50 | private $instanceCache = null; |
| 51 | |
| 52 | /** |
| 53 | * Indicater whenever the end of the current cache is also the end of the current class |
| 54 | * |
| 55 | * @var boolean |
| 56 | */ |
| 57 | private $endOfResource = false; |
| 58 | |
| 59 | /** |
| 60 | * Whenever we already moved the pointer, used to prevent unnecessary rewinds |
| 61 | * |
| 62 | * @var boolean |
| 63 | */ |
| 64 | private $unmoved = true; |
| 65 | |
| 66 | /** |
| 67 | * DeliveryMonitoringIterator constructor. |
| 68 | * @param ServiceLocatorInterface $serviceLocator |
| 69 | * @throws \common_exception_Error |
| 70 | */ |
| 71 | public function __construct(ServiceLocatorInterface $serviceLocator) |
| 72 | { |
| 73 | $this->setServiceLocator($serviceLocator); |
| 74 | $this->load(0); |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * (non-PHPdoc) |
| 79 | * @see Iterator::rewind() |
| 80 | */ |
| 81 | public function rewind() |
| 82 | { |
| 83 | if (!$this->unmoved) { |
| 84 | $this->unmoved = true; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * (non-PHPdoc) |
| 90 | * @see Iterator::current() |
| 91 | */ |
| 92 | public function current() |
| 93 | { |
| 94 | return $this->instanceCache[$this->currentInstance]; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * (non-PHPdoc) |
| 99 | * @see Iterator::key() |
| 100 | */ |
| 101 | public function key() |
| 102 | { |
| 103 | return $this->currentInstance; |
| 104 | } |
| 105 | |
| 106 | |
| 107 | public function valid() |
| 108 | { |
| 109 | return isset($this->instanceCache[$this->currentInstance]); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * (non-PHPdoc) |
| 114 | * @see Iterator::next() |
| 115 | */ |
| 116 | public function next() |
| 117 | { |
| 118 | $this->unmoved = false; |
| 119 | if ($this->valid()) { |
| 120 | $this->currentInstance++; |
| 121 | if (!isset($this->instanceCache[$this->currentInstance])) { |
| 122 | // try to load next block (unless we know it's empty) |
| 123 | $remainingInstances = !$this->endOfResource && $this->load($this->currentInstance); |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * @param $offset |
| 130 | * @return bool |
| 131 | */ |
| 132 | protected function load($offset) |
| 133 | { |
| 134 | \common_Logger::d(__CLASS__ . '::load offset = ' . $offset); |
| 135 | |
| 136 | /** @var DeliveryMonitoringService $deliveryMonitoringService */ |
| 137 | $deliveryMonitoringService = $this->getServiceLocator()->get(DeliveryMonitoringService::SERVICE_ID); |
| 138 | $options = array( |
| 139 | 'offset' => $offset, |
| 140 | 'limit' => self::CACHE_SIZE |
| 141 | ); |
| 142 | |
| 143 | $executions = $deliveryMonitoringService->find([], $options); |
| 144 | |
| 145 | $this->instanceCache = array(); |
| 146 | |
| 147 | foreach ($executions as $execution) { |
| 148 | $this->instanceCache[$offset] = $execution->get(); |
| 149 | $offset++; |
| 150 | } |
| 151 | |
| 152 | $this->endOfResource = count($executions) < self::CACHE_SIZE; |
| 153 | |
| 154 | return count($executions) > 0; |
| 155 | } |
| 156 | } |