function performance_traverse_cache in Performance Logging and Monitoring 6.2

Same name and namespace in other branches

1. 7.2 performance.module \performance_traverse_cache()

Helper function to traverse the cache_bin data for retrieving and/or pruning data.

Parameters

$callback string function to execute on the data fetched:

$args optional additional argument(s) to pass to the callback (use an: array or object to pass multiple arguments)

Return value

array of data where the contents depends on the callback

4 calls to performance_traverse_cache()

drush_performance_summary in ./performance.drush.inc

Summary page callback. Differs a little from the version in the module because drush_print_table() works differently.

performance_cron in ./performance.module

Implementation of hook_cron().

performance_gather_summary_data in ./performance.module

Gather performance data for external modules.

performance_view_summary in ./performance.module

Summary page callback.

File

./performance.module, line 414

Logs detailed and/or summary page generation time and memory consumption for page requests. Copyright Khalid Baheyeldin 2008 of http://2bits.com

Code

function performance_traverse_cache($callback, $args = NULL) {
  $data_list = array();
  $pruned = FALSE;
  if ($keys_cache = cache_get(PERFORMANCE_KEY, PERFORMANCE_BIN)) {

    // is_array() check to prevent anything from ever going wrong here.
    if (is_array($keys_cache->data)) {
      foreach ($keys_cache->data as $key => $value) {
        $cache = cache_get($key, PERFORMANCE_BIN);
        if (!$cache) {

          // Cache entry for this key has expired, remove the key.
          unset($keys_cache->data[$key]);

          // Mark as pruned: we have to rewrite the keys cache!
          $pruned = TRUE;
        }
        else {

          // call_user_func() does not support passing by reference. See
          // http://php.net/manual/en/function.call-user-func-array.php and the
          // note about PHP 5.4 concerning the possibility of passing by
          // reference there. Hence this approach to prevent future
          // compatibility issues
          if ($data = call_user_func($callback, $cache, $args)) {
            $data_list[] = $data;
          }
        }
      }
    }
  }

  // Write the pruned key cache if needed.
  if ($pruned) {
    cache_set(PERFORMANCE_KEY, $keys_cache->data, PERFORMANCE_BIN);
  }
  return $data_list;
}