/
observable.lua
52 lines (47 loc) · 1.36 KB
/
observable.lua
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Lobby = LCS.class{}
local LOG_SECTION = "liblobby"
function Lobby:AddListener(event, listener)
if listener == nil then
Spring.Log(LOG_SECTION, LOG.ERROR, "Event: " .. tostring(event) .. ", listener cannot be nil")
return
end
local eventListeners = self.listeners[event]
if eventListeners == nil then
eventListeners = {}
self.listeners[event] = eventListeners
end
table.insert(eventListeners, listener)
end
function Lobby:RemoveListener(event, listener)
if self.listeners[event] then
for k, v in pairs(self.listeners[event]) do
if v == listener then
table.remove(self.listeners[event], k)
if #self.listeners[event] == 0 then
self.listeners[event] = nil
end
break
end
end
end
end
-- Using solution in http://lua-users.org/lists/lua-l/2006-02/msg00537.html
function Lobby:_CallListeners(event, ...)
if self.listeners[event] == nil then
return nil -- no event listeners
end
local eventListeners = ShallowCopy(self.listeners[event])
local args = {...}
local n = select("#", ...)
for i = 1, #eventListeners do
local listener = eventListeners[i]
xpcall(function() listener(listener, unpack(args, 1, n)) end,
function(err) self:_PrintError(err) end )
end
return true
end
function Lobby:_PrintError(err)
-- FIXME: cleanup more
Spring.Log(LOG_SECTION, LOG.ERROR, err)
Spring.Log(LOG_SECTION, LOG.ERROR, debug.traceback(err))
end