From e5b758dbbef6774943abf453a43114a2c3371b4a Mon Sep 17 00:00:00 2001
From: Evan Prodromou <evan@controlyourself.ca>
Date: Sun, 28 Jun 2009 14:38:31 -0400
Subject: start of queuemanager code

---
 lib/stompqueuemanager.php | 122 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 lib/stompqueuemanager.php

(limited to 'lib/stompqueuemanager.php')

diff --git a/lib/stompqueuemanager.php b/lib/stompqueuemanager.php
new file mode 100644
index 000000000..20c6e7a34
--- /dev/null
+++ b/lib/stompqueuemanager.php
@@ -0,0 +1,122 @@
+<?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);
+        }
+    }
+}
-- 
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