/**
* Record a pageview on a particular test and variation.
*
* @access public
* @param string $test_id
* @param array $variation_id
* @return mixed
*/
public function addPageview($test_id, $variation_id)
{
$this->getClient();
// transaction timestamp
$now = new \DateTime('now', new \DateTimeZone('UTC'));
$now = $now->format('U');
// begin a transaction
$responses = $this->client->multiExec(function ($tx) use($test_id, $variation_id) {
// increment the object hash counts
$this->client->hincrby('test:' . $test_id, 'pageviews', 1);
$this->client->hincrby('variation:' . $variation_id, 'pageviews', 1);
// increment the sorted set counts for pageview rankings
$testPageviews = $this->client->zincrby('tests:sorted_by_views', 1, $test_id);
$variationPageviews = $this->client->zincrby('variations:sorted_by_views', 1, $variation_id);
// retrieve the hash wins
$variationWins = $this->client->hget('variation:' . $variation_id, 'wins');
// calculate ranking change
$rank = 0.0;
if ($variationPageviews > 0) {
$rank = $variationWins / $variationPageviews;
}
// update the variation rankings
$this->client->zadd('variations:sorted_by_rank', $rank, $variation_id);
});
}
