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
42 public $master = null;
43 public $handlers = array();
44 public $groups = array();
47 * Factory function to pull the appropriate QueueManager object
48 * for this site's configuration. It can then be used to queue
49 * events for later processing or to spawn a processing loop.
51 * Plugins can add to the built-in types by hooking StartNewQueueManager.
53 * @return QueueManager
55 public static function get()
57 if (empty(self::$qm)) {
59 if (Event::handle('StartNewQueueManager', array(&self::$qm))) {
61 $enabled = common_config('queue', 'enabled');
62 $type = common_config('queue', 'subsystem');
65 // does everything immediately
66 self::$qm = new UnQueueManager();
70 self::$qm = new DBQueueManager();
73 self::$qm = new StompQueueManager();
76 throw new ServerException("No queue manager class for type '$type'");
86 * @fixme wouldn't necessarily work with other class types.
87 * Better to change the interface...?
89 public static function multiSite()
91 if (common_config('queue', 'subsystem') == 'stomp') {
92 return IoManager::INSTANCE_PER_PROCESS;
94 return IoManager::SINGLE_ONLY;
98 function __construct()
104 * Optional; ping any running queue handler daemons with a notification
105 * such as announcing a new site to handle or requesting clean shutdown.
106 * This avoids having to restart all the daemons manually to update configs
109 * Called from scripts/queuectl.php controller utility.
111 * @param string $event event key
112 * @param string $param optional parameter to append to key
113 * @return boolean success
115 public function sendControlSignal($event, $param='')
117 throw new Exception(get_class($this) . " does not support control signals.");
121 * Store an object (usually/always a Notice) into the given queue
122 * for later processing. No guarantee is made on when it will be
123 * processed; it could be immediately or at some unspecified point
126 * Must be implemented by any queue manager.
128 * @param Notice $object
129 * @param string $queue
131 abstract function enqueue($object, $queue);
134 * Build a representation for an object for logging
138 function logrep($object) {
139 if (is_object($object)) {
140 $class = get_class($object);
141 if (isset($object->id)) {
142 return "$class $object->id";
146 if (is_string($object)) {
147 $len = strlen($object);
148 $fragment = mb_substr($object, 0, 32);
149 if (mb_strlen($object) > 32) {
152 return "string '$fragment' ($len bytes)";
154 return strval($object);
158 * Encode an object or variable for queued storage.
159 * Notice objects are currently stored as an id reference;
160 * other items are serialized.
165 protected function encode($item)
167 if ($item instanceof Notice) {
171 return serialize($item);
176 * Decode an object from queued storage.
177 * Accepts notice reference entries and serialized items.
182 protected function decode($frame)
184 if (is_numeric($frame)) {
185 // Back-compat for notices...
186 return Notice::staticGet(intval($frame));
187 } elseif (substr($frame, 0, 1) == '<') {
188 // Back-compat for XML source
192 #$old = error_reporting();
193 #error_reporting($old & ~E_NOTICE);
194 $out = unserialize($frame);
195 #error_reporting($old);
197 if ($out === false && $frame !== 'b:0;') {
198 common_log(LOG_ERR, "Couldn't unserialize queued frame: $frame");
206 * Instantiate the appropriate QueueHandler class for the given queue.
208 * @param string $queue
209 * @return mixed QueueHandler or null
211 function getHandler($queue)
213 if (isset($this->handlers[$queue])) {
214 $class = $this->handlers[$queue];
215 if (class_exists($class)) {
218 common_log(LOG_ERR, "Nonexistent handler class '$class' for queue '$queue'");
221 common_log(LOG_ERR, "Requested handler for unkown queue '$queue'");
227 * Get a list of registered queue transport names to be used
230 * @return array of strings
234 $group = $this->activeGroup();
235 return array_keys($this->groups[$group]);
239 * Initialize the list of queue handlers
241 * @event StartInitializeQueueManager
242 * @event EndInitializeQueueManager
244 function initialize()
246 // @fixme we'll want to be able to listen to particular queues...
247 if (Event::handle('StartInitializeQueueManager', array($this))) {
248 $this->connect('plugin', 'PluginQueueHandler');
249 $this->connect('omb', 'OmbQueueHandler');
250 $this->connect('ping', 'PingQueueHandler');
251 $this->connect('distrib', 'DistribQueueHandler');
252 if (common_config('sms', 'enabled')) {
253 $this->connect('sms', 'SmsQueueHandler');
256 // XMPP output handlers...
257 $this->connect('jabber', 'JabberQueueHandler');
258 $this->connect('public', 'PublicQueueHandler');
259 // @fixme this should get an actual queue
260 //$this->connect('confirm', 'XmppConfirmHandler');
262 // For compat with old plugins not registering their own handlers.
263 $this->connect('plugin', 'PluginQueueHandler');
265 $this->connect('xmppout', 'XmppOutQueueHandler', 'xmppdaemon');
268 Event::handle('EndInitializeQueueManager', array($this));
272 * Register a queue transport name and handler class for your plugin.
273 * Only registered transports will be reliably picked up!
275 * @param string $transport
276 * @param string $class
277 * @param string $group
279 public function connect($transport, $class, $group='queuedaemon')
281 $this->handlers[$transport] = $class;
282 $this->groups[$group][$transport] = $class;
286 * @return string queue group to use for this request
288 function activeGroup()
290 $group = 'queuedaemon';
293 if ($this->master instanceof XmppMaster) {
301 * Send a statistic ping to the queue monitoring system,
302 * optionally with a per-queue id.
305 * @param string $queue
307 function stats($key, $queue=false)
311 $owners[] = "queue:$queue";
312 $owners[] = "site:" . common_config('site', 'server');
314 if (isset($this->master)) {
315 $this->master->stats($key, $owners);
317 $monitor = new QueueMonitor();
318 $monitor->stats($key, $owners);