/**
* Attempt to process a chunk from the queue.
*
* @param bool $log
* (optional) Whether diagnostic failure should be logged or not.
*/
protected function processQueueChunk($log = TRUE)
{
// Test if the diagnostic tests prohibit purging the queue.
if (!_acquia_purge_are_we_allowed_to_purge()) {
if ($log) {
$err = _acquia_purge_get_diagnosis(ACQUIA_PURGE_SEVLEVEL_ERROR);
_acquia_purge_get_diagnosis_logged($err);
}
return;
}
// Acquire a lock and process a chunk from the queue.
if ($this->service->lockAcquire()) {
$this->service->process();
$this->service->lockRelease();
}
}
/**
* Process a chunk of items form the queue and respond in JSON.
*
* @return string
* Statistics array encoded as JSON, including a 'widget' HTML snippet.
*/
public static function pathCallback()
{
$service = _acquia_purge_service();
$stats = $service->stats();
$stats['error'] = FALSE;
$stats['widget'] = ' ';
// Deny access when the current user didn't initiate queue processing.
if (!self::isUserOwningTheQueue($service)) {
$stats['running'] = FALSE;
return drupal_json_output($stats);
}
// Test for blocking diagnostic issues and report any if found.
if (!_acquia_purge_are_we_allowed_to_purge()) {
$err = current(_acquia_purge_get_diagnosis(ACQUIA_PURGE_SEVLEVEL_ERROR));
_acquia_purge_get_diagnosis_logged($err);
$stats['error'] = $err['description'];
return drupal_json_output($stats);
}
// Attempt to process a chunk from the queue.
if ($service->lockAcquire()) {
$service->process();
foreach ($service->stats() as $key => $value) {
$stats[$key] = $value;
}
// When processing stalled, the history breadcrumb often stays empty and
// this is a clear indication that errors occurred.
if (empty($stats['purgehistory'])) {
$stats['error'] = t("The system seems to be having difficulties\r\n refreshing recent content changes. Your work won't be lost, but please\r\n do ask your technical administrator to check the logs.");
}
$service->lockRelease();
} else {
$stats['locked'] = TRUE;
}
// Render the status widget and render as JSON response.
if (!$stats['error']) {
$stats['widget'] = theme('acquia_purge_status_bar_widget', $stats);
}
return drupal_json_output($stats);
}
