--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/pubsub.lua	Sat Nov 13 03:16:58 2010 +0000
@@ -0,0 +1,35 @@
+module("pubsub", package.seeall);
+
+local service = {};
+local service_mt = { __index = service };
+
+function new(cb)
+	return setmetatable({ cb = cb or {}, nodes = {} }, service_mt);
+end
+
+function service:add_subscription(node, actor, jid)
+	local node_obj = self.nodes[node];
+	if not node_obj then
+		return false, "item-not-found";
+	end
+	node_obj.subscribers[jid] = true;
+	return true;
+end
+
+function service:remove_subscription(node, actor, jid)
+	self.nodes[node].subscribers[jid] = nil;
+	return true;
+end
+
+function service:publish(node, actor, id, item)
+	local node_obj = self.nodes[node];
+	if not node_obj then
+		node_obj = { name = node, subscribers = {}, config = {} };
+		self.nodes[node] = node_obj;
+	end
+	node_obj.data = item;
+	self.cb.broadcaster(node, node_obj.subscribers, item);
+	return true;
+end
+
+return _M;