Publish and Subscribe
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Pub/Sub is a messaging paradigm that allows publishers to send messages to subscribers through a broker. In Drupal, it allows content like nodes to be published from one site to another. Key aspects of Pub/Sub in Drupal include topics defined by views, filtering content via rules, and supporting push and pull of content between loosely coupled systems. It can integrate with other modules via hooks and is used on a case study site to sync over 57k nodes across 21 channels.
![Integration
hook_subscribe_postsave(&$node)
function flag_pub_sub_subscribe_postsave(&$node) {
$flag = flag_get_flag(FLAG_PUB_SUB_FLAG_NAME);
if ($flag == null) {
return;
}
if ($node->flag_pub_sub[FLAG_PUB_SUB_FLAG_NAME]) {
$flag->flag('flag', $node->nid);
}
}](https://image.slidesharecdn.com/pubsub-100606031553-phpapp02/85/Publish-and-Subscribe-13-320.jpg)
Publish and Subscribe
- 2. Me Alexandru Badiu Drupal user and contributor since 2003 Adulmec LLC Drupal Romania Drupal.ro
- 3. We’re goning to talk about What is Pub/Sub Pub/Sub in Drupal Basic usage Advanced features Integration with 3rd party modules Case study: Urbo.ro
- 4. What is Pub/Sub? Messaging paradigm Sibling of Message queues Publisher, Subscriber, Broker Decoupled Topic based Content based Push Pull
- 5. What is Pub/Sub? Advantages Loosely coupled Scalable Disadvantages Not so scalable on large deployments Loosely coupled
- 7. Pub/Sub in Drupal Not pure Pub / Sub Content synchronization (tightly coupled) Content propagation (loosely coupled) Domain module alternative A hybrid system (topic and content based) The content are nodes Supports Pull and Push Uses XML-RPC
- 8. Pub/Sub in Drupal Topics are defined by views Content filtering is done via filters node_save() and alternatives Supports private channels Token based security Works with most CCK field types (no userreference) Syncs taxonomy terms Syncs files uploaded to nodes Deletion propagation
- 9. Basic usage - Demo Set up taxonomies Set up a publisher and a channel Set up a subscriber to that channel Add some nodes into the queue Push Pull
- 10. Advanced usage - Demo Using the filters Node reference Deletion propagation Syncing uploaded files Excluding nodes Tying nodes together
- 11. Integration hook_publish_prepare(&$node) publish_node_was_changed($nid) hook_subscribe_presave(&$node) hook_subscribe_postsave(&$node)
- 12. Integration hook_publish_prepare(&$node) function flag_pub_sub_publish_prepare(&$node) { $flag = flag_get_flag(FLAG_PUB_SUB_FLAG_NAME); if ($flag == null) { return; } if (!$flag->is_flagged($node->nid)) { return; } $node->flag_pub_sub = array( FLAG_PUB_SUB_FLAG_NAME => true, ); }
- 13. Integration hook_subscribe_postsave(&$node) function flag_pub_sub_subscribe_postsave(&$node) { $flag = flag_get_flag(FLAG_PUB_SUB_FLAG_NAME); if ($flag == null) { return; } if ($node->flag_pub_sub[FLAG_PUB_SUB_FLAG_NAME]) { $flag->flag('flag', $node->nid); } }
- 14. Integration publish_node_was_changed($nid) _bulk_media_update_statistics($nid); if (module_exists('publish')) { publish_node_was_changed($nid); }
- 15. Case study: Urbo.ro ‣We use Pub / Sub to sync nodes ‣Custom modules for extra data ‣21 channels and subscriptions ‣57 k nodes managed
- 16. Thanks andu@ctrlz.ro http://ctrlz.ro / http://corporate.adulmec.ro Photo credit: Flickr users Gl3am, nidhug and scattered sunshine.