many jabber queue management changes

Added a method to QueueManager to let subclasses do stuff when idle.
Needed so that XMPP queue manager can service its message queue.

Cleaned up jabber_broadcast_message quite a bit. Use custom joins
instead of loop-and-query, should fix some problems with users who are
getting messages even after turning off notification. Only build $msg
and $entry once, and use the XMPPHP function for messages with a
payload, rather than rolling our own.

darcs-hash:20080829200352-84dde-427e4ca8c81d4222a36f78e7c580b611ff0bf765.gz

scripts/xmppqueuehandler.php

@@ -34,6 +34,8 @@ require_once(INSTALLDIR . '/lib/queuehandler.php');
 set_error_handler('common_error_handler');
 
 class XmppQueueHandler extends QueueHandler {
+
+	var $conn = NULL;
 	
 	function transport() {
 		return 'jabber';
@@ -42,15 +44,24 @@ class XmppQueueHandler extends QueueHandler {
 	function start() {
 		# Low priority; we don't want to receive messages
 		$this->conn = jabber_connect($this->_id, NULL, -1);
+		$this->conn->addEventHandler('message', 'forward_message', $this);
 		return !is_null($this->conn);
 	}
 
 	function handle_notice($notice) {
 		return jabber_broadcast_notice($notice);
 	}
+
+	function idle() {
+		# Process the queue for a second
+		$this->conn->processTime(1);
+	}
 	
 	function finish() {
 	}
+	
+	function forward_message(&$pl) {
+	}
 }
 
 mb_internal_encoding('UTF-8');