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authorEvan Prodromou <evan@controlyourself.ca>2009-06-28 14:38:31 -0400
committerEvan Prodromou <evan@controlyourself.ca>2009-06-28 14:38:31 -0400
commite5b758dbbef6774943abf453a43114a2c3371b4a (patch)
treef26ac9adb322012cd0abd687e6581a54a87f89e6 /lib/stompqueuemanager.php
parent871f598dcc81d7018f25590d767591722bb977f2 (diff)
start of queuemanager code
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+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Abstract class for queue 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 Laconica
+ * @author Evan Prodromou <evan@controlyourself.ca>
+ * @author Sarven Capadisli <csarven@controlyourself.ca>
+ * @copyright 2009 Control Yourself, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ */
+
+require_once 'Stomp.php';
+
+class QueueManager
+{
+ var $server = null;
+ var $username = null;
+ var $password = null;
+ var $base = null;
+ var $con = null;
+ var $frames = array();
+
+ function __construct()
+ {
+ $this->server = common_config('queue', 'stomp_server');
+ $this->username = common_config('queue', 'stomp_username');
+ $this->password = common_config('queue', 'stomp_password');
+ $this->base = common_config('queue', 'queue_basename');
+ }
+
+ function _connect()
+ {
+ if (empty($this->con)) {
+ $this->con = new Stomp($this->server);
+
+ if (!$this->con->connect($this->username, $this->password)) {
+ $this->_log(LOG_ERR, 'Failed to connect to queue server');
+ throw new ServerException('Failed to connect to queue server');
+ }
+ }
+ }
+
+ function enqueue($object, $queue)
+ {
+ $notice = (Notice)$object;
+
+ $this->_connect();
+
+ $result = $this->con->send($this->_queueName($queue),
+ $notice->id, // BODY of the message
+ array ('created' => $notice->created));
+
+ if (!$result) {
+ common_log(LOG_ERR, 'Error sending to '.$transport.' queue');
+ return false;
+ }
+
+ common_log(LOG_DEBUG, 'complete remote queueing notice ID = '
+ . $notice->id . ' for ' . $transport);
+ }
+
+ function nextItem($queue, $timeout=null)
+ {
+ $result = null;
+
+ $this->_connect();
+
+ $frame = $this->con->readFrame();
+
+ if ($frame) {
+ $this->log(LOG_INFO, 'Got item enqueued '.common_exact_date($frame->headers['created']));
+
+ // XXX: Now the queue handler receives only the ID of the
+ // notice, and it has to get it from the DB
+ // A massive improvement would be avoid DB query by transmitting
+ // all the notice details via queue server...
+ $notice = Notice::staticGet($frame->body);
+
+ if ($notice) {
+ } else {
+ $this->log(LOG_WARNING, 'queue item for notice that does not exist');
+ }
+ }
+ }
+
+ function done($object, $queue)
+ {
+ $notice = (Notice)$object;
+
+ $this->_connect();
+
+ $frame = $this->_getFrame($notice, $queue);
+
+ if (empty($frame)) {
+ $this->log(LOG_ERR, 'Cannot find frame for notice '.$notice->id.' in queue '.$queue);
+ } else {
+ // if the msg has been handled positively, ack it
+ // and the queue server will remove it from the queue
+ $this->con->ack($frame);
+ $this->log(LOG_INFO, 'finished broadcasting notice ID = ' . $notice->id);
+ }
+ }
+}