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Implement second part of adaptive update interval; improves #51

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Implements part of algorithm used when feed has been updated
This commit is contained in:
J. King 2017-04-27 09:47:40 -04:00
parent 2e64e60f2e
commit 3b4d79abc8
1 changed files with 43 additions and 19 deletions
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62
lib/Feed.php
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@ -227,27 +227,51 @@ class Feed {
}
public function nextFetch(): \DateTime {
$now = new \DateTime();
if(!$this->modified) {
$now = time();
$diff = $now - $this->lastModified->getTimestamp();
if($diff < (30 * 60)) { // less than 30 minutes
$offset = "15 minutes";
} else if($diff < (60 * 60)) { // less than an hour
$offset = "30 minutes";
} else if($diff < (3 * 60 * 60)) { // less than three hours
$offset = "1 hour";
} else if($diff > (36 * 60 * 60)) { // more than 36 hours
$offset = "1 day";
} else {
$offset = "3 hours";
}
$t = new \DateTime();
$t->setTimestamp($now);
$t->modify("+".$offset);
return $t;
$diff = $now->getTimestamp() - $this->lastModified->getTimestamp();
$offset = $this->normalizeDateDiff($diff);
$now->modify("+".$offset);
} else {
// FIXME: implement algorithm to use when a feed has been updated
return new \DateTime("now + 3 hours");
$dates = [];
$offsets = [];
foreach($this->data->items as $item) {
if($item->updatedDate) $dates[] = $item->updatedDate->getTimestamp();
if($item->publishedDate) $dates[] = $item->publishedDate->getTimestamp();
}
$dates = array_unique($dates, \SORT_NUMERIC);
rsort($dates);
if(sizeof($dates) > 3) {
for($a = 0; $a < 3; $a++) {
$diff = $dates[$a+1] - $dates[$a];
$offsets[] = $this->normalizeDateDiff($diff);
}
if($offsets[0]==$offsets[1] || $offsets[0]==$offsets[2]) {
$now->modify("+".$offsets[0]);
} else if($offsets[1]==$offsets[2]) {
$now->modify("+".$offsets[1]);
} else {
$now->modify("+ 1 hour");
}
} else {
$now->modify("+ 1 hour");
}
}
return $now;
}
protected function normalizeDateDiff(int $diff): string {
if($diff < (30 * 60)) { // less than 30 minutes
$offset = "15 minutes";
} else if($diff < (60 * 60)) { // less than an hour
$offset = "30 minutes";
} else if($diff < (3 * 60 * 60)) { // less than three hours
$offset = "1 hour";
} else if($diff > (36 * 60 * 60)) { // more than 36 hours
$offset = "1 day";
} else {
$offset = "3 hours";
}
return $offset;
}
}