public function get_history_summary()
{
$w = new UsageStatistics_StorageWriter();
$w->maybe_flush_hotspot_data();
$history_encoded = get_site_option('w3tc_stats_history');
$history = null;
if (!empty($history_encoded)) {
$history = json_decode($history_encoded, true);
}
if (!is_array($history)) {
$history = array();
}
$summary = array('memcached_servers' => array(), 'redis_servers' => array());
if (count($history) <= 0) {
$summary = array('period' => array());
} else {
$timestamp_start = $history[0]['timestamp_start'];
$timestamp_end = $history[count($history) - 1]['timestamp_end'];
$period = array('timestamp_start' => $timestamp_start, 'timestamp_start_mins' => Util_UsageStatistics::time_mins($timestamp_start), 'timestamp_end' => $timestamp_end, 'timestamp_end_mins' => Util_UsageStatistics::time_mins($timestamp_end));
$period['seconds'] = $timestamp_end - $timestamp_start;
$summary['period'] = $period;
$summary['timeout_time'] = time() + 15;
$summary = apply_filters('w3tc_usage_statistics_summary_from_history', $summary, $history);
if (count($summary['memcached_servers']) > 0) {
$summary['memcached'] = $this->get_memcached_summary($summary['memcached_servers']);
}
if (count($summary['redis_servers']) > 0) {
$summary['redis'] = $this->get_redis_summary($summary['redis_servers']);
}
}
$summary['period']['to_update_secs'] = (int) $w->get_hotspot_end() - time() + 1;
unset($summary['memcached_servers']);
unset($summary['redis_servers']);
return $summary;
}
