gnu-social/lib/queuemanager.php
Craig Andrews bd72e8b96e Allow for instances as well as class names to be passed as queue handlers and iomanagers.
Introduce IoManager::GLOBAL_SINGLE_ONLY which indicates that only one instance of this iomanager will be run, regardless of how many threads/processes and sites there are.
2010-01-20 20:15:56 -05:00

216 lines
6.8 KiB
PHP

<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Abstract class for i/o managers
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category QueueManager
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Sarven Capadisli <csarven@status.net>
* @author Brion Vibber <brion@status.net>
* @copyright 2009-2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
/**
* Completed child classes must implement the enqueue() method.
*
* For background processing, classes should implement either socket-based
* input (handleInput(), getSockets()) or idle-loop polling (idle()).
*/
abstract class QueueManager extends IoManager
{
static $qm = null;
/**
* Factory function to pull the appropriate QueueManager object
* for this site's configuration. It can then be used to queue
* events for later processing or to spawn a processing loop.
*
* Plugins can add to the built-in types by hooking StartNewQueueManager.
*
* @return QueueManager
*/
public static function get()
{
if (empty(self::$qm)) {
if (Event::handle('StartNewQueueManager', array(&self::$qm))) {
$enabled = common_config('queue', 'enabled');
$type = common_config('queue', 'subsystem');
if (!$enabled) {
// does everything immediately
self::$qm = new UnQueueManager();
} else {
switch ($type) {
case 'db':
self::$qm = new DBQueueManager();
break;
case 'stomp':
self::$qm = new StompQueueManager();
break;
default:
throw new ServerException("No queue manager class for type '$type'");
}
}
}
}
return self::$qm;
}
/**
* @fixme wouldn't necessarily work with other class types.
* Better to change the interface...?
*/
public static function multiSite()
{
if (common_config('queue', 'subsystem') == 'stomp') {
return IoManager::INSTANCE_PER_PROCESS;
} else {
return IoManager::SINGLE_ONLY;
}
}
function __construct()
{
$this->initialize();
}
/**
* Store an object (usually/always a Notice) into the given queue
* for later processing. No guarantee is made on when it will be
* processed; it could be immediately or at some unspecified point
* in the future.
*
* Must be implemented by any queue manager.
*
* @param Notice $object
* @param string $queue
*/
abstract function enqueue($object, $queue);
/**
* Instantiate the appropriate QueueHandler class for the given queue.
*
* @param string $queue
* @return mixed QueueHandler or null
*/
function getHandler($queue)
{
if (isset($this->handlers[$queue])) {
$class = $this->handlers[$queue];
if(is_object($class)) {
return $class;
} else if (class_exists($class)) {
return new $class();
} else {
common_log(LOG_ERR, "Nonexistent handler class '$class' for queue '$queue'");
}
} else {
common_log(LOG_ERR, "Requested handler for unkown queue '$queue'");
}
return null;
}
/**
* Get a list of all registered queue transport names.
*
* @return array of strings
*/
function getQueues()
{
return array_keys($this->handlers);
}
/**
* Initialize the list of queue handlers
*
* @event StartInitializeQueueManager
* @event EndInitializeQueueManager
*/
function initialize()
{
if (Event::handle('StartInitializeQueueManager', array($this))) {
if (!defined('XMPP_ONLY_FLAG')) { // hack!
$this->connect('plugin', 'PluginQueueHandler');
$this->connect('omb', 'OmbQueueHandler');
$this->connect('ping', 'PingQueueHandler');
if (common_config('sms', 'enabled')) {
$this->connect('sms', 'SmsQueueHandler');
}
}
// XMPP output handlers...
if (common_config('xmpp', 'enabled') && !defined('XMPP_EMERGENCY_FLAG')) {
$this->connect('jabber', 'JabberQueueHandler');
$this->connect('public', 'PublicQueueHandler');
// @fixme this should move up a level or should get an actual queue
$this->connect('confirm', 'XmppConfirmHandler');
}
if (!defined('XMPP_ONLY_FLAG')) { // hack!
// For compat with old plugins not registering their own handlers.
$this->connect('plugin', 'PluginQueueHandler');
}
}
if (!defined('XMPP_ONLY_FLAG')) { // hack!
Event::handle('EndInitializeQueueManager', array($this));
}
}
/**
* Register a queue transport name and handler class for your plugin.
* Only registered transports will be reliably picked up!
*
* @param string $transport
* @param string $class class name or object instance
*/
public function connect($transport, $class)
{
$this->handlers[$transport] = $class;
}
/**
* Send a statistic ping to the queue monitoring system,
* optionally with a per-queue id.
*
* @param string $key
* @param string $queue
*/
function stats($key, $queue=false)
{
$owners = array();
if ($queue) {
$owners[] = "queue:$queue";
$owners[] = "site:" . common_config('site', 'server');
}
if (isset($this->master)) {
$this->master->stats($key, $owners);
} else {
$monitor = new QueueMonitor();
$monitor->stats($key, $owners);
}
}
}