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In this computer age, people have grown to hate hourglasses, spinning beach balls, and pop-ups that say, Please Wait. Although giving a visual clue that the computer is working beats giving no such clue and letting customers think their computers have locked up, better still would be to never have episodes of slowness that make users wait. You may not always be able to achieve that goal, but you should always try. Fetching and storing data in a persistent store can take a long time, especially when a lot of data is involved. This chapter helps assure you that you understand how Core Data helps you, and how you must help yourself, to make sure you don t pepper your users with Please Wait spinners or, worse, an unresponsive application that appears locked up while it retrieves or saves large object graphs. We show you how to utilize the various tools and strategies, such as caching, faulting, and using the Instruments application that comes with Xcode.

Now you ll begin to implement some AJAX functionality. One of the great features of jQuery is its ability to submit its own HTTP GET or POST requests, which is how you ll submit the vote to Drupal without refreshing the entire page. jQuery will intercept the clicking of the Vote link and will send a request to Drupal to save the vote and return the updated total. jQuery will use the new value to update the score on the page. Figure 18-9 shows a big picture overview of where we re going. Once jQuery intercepts the clicking of the Vote link, it needs to be able to call a Drupal function via a URL. We ll use hook_menu() to map the vote URL submitted by jQuery to a Drupal PHP function. The PHP function saves the vote to the database and returns the new score to jQuery in JavaScript Object Notation (JSON) (OK, so we re not using XML and thus it s not strictly AJAX). /** * Implements hook_menu(). */ function plusone_menu() { $items['plusone/vote'] = array( 'title' => 'Vote', 'page callback' => 'plusone_vote', 'access arguments' => array('rate content'), 'type' => MENU_SUGGESTED_ITEM, ); return $items; } In the preceding function, whenever a request for the path plusone/vote comes in, the function plusone_vote() handles it when the user requesting the path has the rate content permission.

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"deserialize" : function(str){...}, "urldecode" : function(str) {...} };

You need a way to perform all this performance testing so that you can verify results. This section walks you through building an application that will allow you to run various tests and see the results. The application presents a list of tests you can run in a standard picker view. To run a test, select it in the picker, click the Run Selected Test button, and wait for the results. After the test runs, you ll see the start time, the stop

Note If the user making the call does not have the rate content permission, Drupal will return an Access Denied page. However, we ll be sure to build our voting widget dynamically so that those ineligible to vote do not see a vote link. But note how Drupal s permission system is protecting us from those nefarious people who might want to bypass our widget and hit the URL http://example.com/ q=plusone/vote directly.

The path plusone/vote/3 translates into the PHP function call plusone_vote(3) (see 4, about Drupal s menu/callback system, for more details). /** * Called by jQuery, or by browser if JavaScript is disabled. * Submits the vote request. If called by jQuery, returns JSON. * If called by the browser, returns page with updated vote total. */ function plusone_vote($nid) { global $user; $nid = (int)$nid; // Authors may not vote on their own posts. We check the node table // to see if this user is the author of the post. $is_author = db_query('SELECT uid from {node} where nid = :nid AND uid = :uid', array(":nid" => (int)$nid, ":uid" => (int)$user->uid))->fetchField(); if ($nid > 0 && !$is_author) { // get current vote count for this user; $vote_count = plusone_get_vote($nid, $user->uid); echo "Vote count is: $vote_count<br/>"; if (!$vote_count) { echo "Yep was existing votes<br/>"; // Delete existing vote count for this user. db_delete('plusone_votes') ->condition('uid', $user->uid) ->condition('nid', $nid) ->execute(); db_insert('plusone_votes') ->fields(array( 'uid' => $user->uid, 'nid' => $nid, 'vote_count' => $vote_count + 1, )) ->execute(); } } $total_votes = plusone_get_total($nid); // Check to see if jQuery made the call. The AJAX call used // the POST method and passed in the key/value pair js = 1. if (!empty($_POST['js'])) { // jQuery made the call // This will return results to jQuery's request drupal_json(array( 'total_votes' => $total_votes, 'voted' => t('You Voted') ) ); exit(); }

time, the number of elapsed seconds for the test, and some text describing the results of the test.

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