153 lines
4.6 KiB
PHP
153 lines
4.6 KiB
PHP
<?php
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/**
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* Laconica, the distributed open-source microblogging tool
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*
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* Abstract class for queue managers
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category QueueManager
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* @package Laconica
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* @author Evan Prodromou <evan@controlyourself.ca>
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* @author Sarven Capadisli <csarven@controlyourself.ca>
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* @copyright 2009 Control Yourself, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://laconi.ca/
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*/
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require_once 'Stomp.php';
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class StompQueueManager
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{
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var $server = null;
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var $username = null;
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var $password = null;
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var $base = null;
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var $con = null;
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var $frames = array();
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function __construct()
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{
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$this->server = common_config('queue', 'stomp_server');
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$this->username = common_config('queue', 'stomp_username');
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$this->password = common_config('queue', 'stomp_password');
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$this->base = common_config('queue', 'queue_basename');
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}
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function _connect()
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{
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if (empty($this->con)) {
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$this->con = new Stomp($this->server);
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if (!$this->con->connect($this->username, $this->password)) {
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$this->_log(LOG_ERR, 'Failed to connect to queue server');
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throw new ServerException('Failed to connect to queue server');
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}
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}
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}
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function enqueue($object, $queue)
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{
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$notice = $object;
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$this->_connect();
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// XXX: serialize and send entire notice
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$result = $this->con->send($this->_queueName($queue),
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$notice->id, // BODY of the message
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array ('created' => $notice->created));
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if (!$result) {
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common_log(LOG_ERR, 'Error sending to '.$transport.' queue');
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return false;
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}
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common_log(LOG_DEBUG, 'complete remote queueing notice ID = '
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. $notice->id . ' for ' . $transport);
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}
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function nextItem($queue, $timeout=null)
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{
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$result = null;
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$this->_connect();
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$frame = $this->con->readFrame();
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if ($frame) {
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$this->log(LOG_INFO, 'Got item enqueued '.common_exact_date($frame->headers['created']));
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// XXX: Now the queue handler receives only the ID of the
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// notice, and it has to get it from the DB
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// A massive improvement would be avoid DB query by transmitting
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// all the notice details via queue server...
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$notice = Notice::staticGet($frame->body);
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if ($notice) {
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$this->_saveFrame($notice, $queue, $frame);
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} else {
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$this->log(LOG_WARNING, 'queue item for notice that does not exist');
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}
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}
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}
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function done($object, $queue)
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{
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$notice = $object;
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$this->_connect();
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$frame = $this->_getFrame($notice, $queue);
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if (empty($frame)) {
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$this->log(LOG_ERR, 'Cannot find frame for notice '.$notice->id.' in queue '.$queue);
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} else {
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// if the msg has been handled positively, ack it
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// and the queue server will remove it from the queue
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$this->con->ack($frame);
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$this->_clearFrame($notice, $queue);
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$this->log(LOG_INFO, 'finished broadcasting notice ID = ' . $notice->id);
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}
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}
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function _frameKey($notice, $queue)
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{
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return ((string)$notice->id) . '-' . $queue;
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}
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function _saveFrame($notice, $queue, $frame)
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{
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$k = $this->_frameKey($notice, $queue);
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$this->_frames[$k] = $frame;
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return true;
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}
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function _getFrame($notice, $queue)
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{
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$k = $this->_frameKey($notice, $queue);
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return $this->_frames[$k];
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}
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function _clearFrame($notice, $queue)
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{
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$k = $this->_frameKey($notice, $queue);
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unset($this->_frames[$k]);
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}
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}
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