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<?php declare(strict_types=1); |
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/* |
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* This file is part of the feed-io package. |
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* |
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* (c) Alexandre Debril <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace FeedIo\Reader\Result; |
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use FeedIo\Feed\ItemInterface; |
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use FeedIo\FeedInterface; |
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class UpdateStats |
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{ |
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const DEFAULT_MIN_DELAY = 3600; |
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const DEFAULT_STALLED_DELAY = 86400; |
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const DEFAULT_MARGIN_RATIO = 0.1; |
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/** |
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* @var FeedInterface |
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*/ |
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protected $feed; |
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/** |
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* @var array |
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*/ |
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protected $intervals; |
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/** |
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* UpdateStats constructor. |
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* @param FeedInterface $feed |
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*/ |
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public function __construct(FeedInterface $feed) |
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{ |
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$this->feed = $feed; |
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$this->intervals = $this->computeIntervals($this->extractDates($feed)); |
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} |
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/** |
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* @param int $minDelay |
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* @param int $stalledDelay |
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* @param float $marginRatio |
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* @return \DateTime |
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*/ |
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public function computeNextUpdate( |
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int $minDelay = self::DEFAULT_MIN_DELAY, |
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int $stalledDelay = self::DEFAULT_STALLED_DELAY, |
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float $marginRatio = self::DEFAULT_MARGIN_RATIO |
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): \DateTime { |
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if ($this->isStalled($marginRatio)) { |
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return (new \DateTime())->setTimestamp(time() + $stalledDelay); |
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} |
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$feedTimeStamp = $this->getFeedTimestamp(); |
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$now = time(); |
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$intervals = [ |
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$this->getMinInterval(), |
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$this->getAverageInterval(), |
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$this->getMedianInterval(), |
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]; |
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sort($intervals); |
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$newTimestamp = $now + $minDelay; |
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foreach ($intervals as $interval) { |
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$computedTimestamp = $this->addInterval($feedTimeStamp, $interval, $marginRatio); |
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if ($computedTimestamp > $now) { |
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$newTimestamp = $computedTimestamp; |
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break; |
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} |
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} |
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return (new \DateTime())->setTimestamp($newTimestamp); |
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} |
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public function isStalled(float $marginRatio): bool |
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{ |
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return time() > $this->addInterval($this->getFeedTimestamp(), $this->getMaxInterval(), $marginRatio); |
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} |
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public function addInterval(int $ts, int $interval, float $marginRatio): int |
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{ |
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return $ts + intval($interval + $marginRatio * $interval); |
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} |
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/** |
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* @return array |
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*/ |
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public function getIntervals(): array |
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{ |
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return $this->intervals; |
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} |
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/** |
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* @return int |
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*/ |
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public function getMinInterval(): int |
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{ |
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return min($this->intervals); |
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} |
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/** |
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* @return int |
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*/ |
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public function getMaxInterval(): int |
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{ |
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return max($this->intervals); |
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} |
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/** |
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* @return int |
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*/ |
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public function getAverageInterval(): int |
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{ |
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$total = array_sum($this->intervals); |
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return intval(floor($total / count($this->intervals))); |
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} |
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/** |
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* @return int |
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*/ |
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public function getMedianInterval(): int |
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{ |
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sort($this->intervals); |
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$num = floor(count($this->intervals) / 2); |
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return $this->intervals[$num]; |
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} |
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private function computeIntervals(array $dates): array |
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{ |
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rsort($dates); |
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$intervals = []; |
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$current = 0; |
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foreach ($dates as $date) { |
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if ($current > 0) { |
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$intervals[] = $current - $date; |
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} |
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$current = $date; |
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} |
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return $intervals; |
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} |
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private function extractDates(FeedInterface $feed): array |
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{ |
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$dates = []; |
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foreach ($feed as $item) { |
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$dates[] = $this->getTimestamp($item); |
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} |
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return $dates; |
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} |
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private function getTimestamp(ItemInterface $item): ? int |
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{ |
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return $item->getLastModified()->getTimestamp(); |
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} |
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private function getFeedTimestamp(): int |
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{ |
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return !! $this->feed->getLastModified() ? $this->feed->getLastModified()->getTimestamp():time(); |
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} |
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} |
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alexdebril /
feed-io
