3 * StatusNet, the distributed open-source microblogging tool
5 * Abstract class for i/o managers
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22 * @category QueueManager
24 * @author Evan Prodromou <evan@status.net>
25 * @author Sarven Capadisli <csarven@status.net>
26 * @author Brion Vibber <brion@status.net>
27 * @copyright 2009-2010 StatusNet, Inc.
28 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
29 * @link http://status.net/
33 * Completed child classes must implement the enqueue() method.
35 * For background processing, classes should implement either socket-based
36 * input (handleInput(), getSockets()) or idle-loop polling (idle()).
38 abstract class QueueManager extends IoManager
43 * Factory function to pull the appropriate QueueManager object
44 * for this site's configuration. It can then be used to queue
45 * events for later processing or to spawn a processing loop.
47 * Plugins can add to the built-in types by hooking StartNewQueueManager.
49 * @return QueueManager
51 public static function get()
53 if (empty(self::$qm)) {
55 if (Event::handle('StartNewQueueManager', array(&self::$qm))) {
57 $enabled = common_config('queue', 'enabled');
58 $type = common_config('queue', 'subsystem');
61 // does everything immediately
62 self::$qm = new UnQueueManager();
66 self::$qm = new DBQueueManager();
69 self::$qm = new StompQueueManager();
72 throw new ServerException("No queue manager class for type '$type'");
82 * @fixme wouldn't necessarily work with other class types.
83 * Better to change the interface...?
85 public static function multiSite()
87 if (common_config('queue', 'subsystem') == 'stomp') {
88 return IoManager::INSTANCE_PER_PROCESS;
90 return IoManager::SINGLE_ONLY;
94 function __construct()
100 * Store an object (usually/always a Notice) into the given queue
101 * for later processing. No guarantee is made on when it will be
102 * processed; it could be immediately or at some unspecified point
105 * Must be implemented by any queue manager.
107 * @param Notice $object
108 * @param string $queue
110 abstract function enqueue($object, $queue);
113 * Instantiate the appropriate QueueHandler class for the given queue.
115 * @param string $queue
116 * @return mixed QueueHandler or null
118 function getHandler($queue)
120 if (isset($this->handlers[$queue])) {
121 $class = $this->handlers[$queue];
122 if (class_exists($class)) {
125 common_log(LOG_ERR, "Nonexistent handler class '$class' for queue '$queue'");
128 common_log(LOG_ERR, "Requested handler for unkown queue '$queue'");
134 * Get a list of all registered queue transport names.
136 * @return array of strings
140 return array_keys($this->handlers);
144 * Initialize the list of queue handlers
146 * @event StartInitializeQueueManager
147 * @event EndInitializeQueueManager
149 function initialize()
151 if (Event::handle('StartInitializeQueueManager', array($this))) {
152 $this->connect('plugin', 'PluginQueueHandler');
153 $this->connect('omb', 'OmbQueueHandler');
154 $this->connect('ping', 'PingQueueHandler');
155 if (common_config('sms', 'enabled')) {
156 $this->connect('sms', 'SmsQueueHandler');
159 // XMPP output handlers...
160 if (common_config('xmpp', 'enabled') && !defined('XMPP_EMERGENCY_FLAG')) {
161 $this->connect('jabber', 'JabberQueueHandler');
162 $this->connect('public', 'PublicQueueHandler');
164 // @fixme this should move up a level or should get an actual queue
165 $this->connect('confirm', 'XmppConfirmHandler');
168 // For compat with old plugins not registering their own handlers.
169 $this->connect('plugin', 'PluginQueueHandler');
171 Event::handle('EndInitializeQueueManager', array($this));
175 * Register a queue transport name and handler class for your plugin.
176 * Only registered transports will be reliably picked up!
178 * @param string $transport
179 * @param string $class
181 public function connect($transport, $class)
183 $this->handlers[$transport] = $class;
187 * Send a statistic ping to the queue monitoring system,
188 * optionally with a per-queue id.
191 * @param string $queue
193 function stats($key, $queue=false)
197 $owners[] = "queue:$queue";
198 $owners[] = "site:" . common_config('site', 'server');
200 if (isset($this->master)) {
201 $this->master->stats($key, $owners);
203 $monitor = new QueueMonitor();
204 $monitor->stats($key, $owners);