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local ipairs, pairs, setmetatable, type =
ipairs, pairs, setmetatable, type;
module "pubsub"
local pubsub_node_mt = { __index = _M };
function new_node(name)
return setmetatable({ name = name, subscribers = {} }, pubsub_node_mt);
end
function set_subscribers(node, subscribers_list, list_type)
local subscribers = node.subscribers;
if list_type == "array" then
for _, jid in ipairs(subscribers_list) do
if not subscribers[jid] then
node:add_subscriber(jid);
end
end
elseif (not list_type) or list_type == "set" then
for jid in pairs(subscribers_list) do
if type(jid) == "string" then
node:add_subscriber(jid);
end
end
end
end
function get_subscribers(node)
return node.subscribers;
end
function publish(node, item, dispatcher, data)
local subscribers = node.subscribers;
for i = 1,#subscribers do
item.attr.to = subscribers[i];
dispatcher(data, item);
end
end
function add_subscriber(node, jid)
local subscribers = node.subscribers;
if not subscribers[jid] then
local space = #subscribers;
subscribers[space] = jid;
subscribers[jid] = space;
end
end
function remove_subscriber(node, jid)
local subscribers = node.subscribers;
if subscribers[jid] then
subscribers[subscribers[jid]] = nil;
subscribers[jid] = nil;
end
end
return _M;
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