I’m attempting to make a custom server list menu for my game using memory store’s hash maps. using this code
local sortedMap = memory:GetHashMap("ServerList_" .. getPlaceName())
local jobId = if not isStudio then game.JobId else "StudioServer" -- jobId is empty in studio
local function updateServerMemoryStore()
pcall(function()
sortedMap:SetAsync(jobId, {
playerCount = #players:GetPlayers(),
maxPlayerCount = players.MaxPlayers,
}, set.ServerListUpdatePeriod + 30) -- accounts for lag and whatever.
-- Server deletes its associated memory store key with :BindClose later on in the script.
-- But this is for the case of a sudden crash.
end)
end
local function deleteServerMemoryStore()
sortedMap:RemoveAsync(jobId)
end
updateServerMemoryStore()
-- messy test code
task.spawn(function()
while true do
task.wait(0.3)
print(sortedMap:ListItemsAsync(200):GetCurrentPage(), " page") -- returns an empty array except for
-- when updateServerMemoryStore has been called previous, and then will print the correct result
-- for one or two iterations before going back to an empty array.
print(sortedMap:GetAsync(jobId), " get async") -- This always returns so I know that the data is being sent to the memory store, but not always being returned by :ListItemsAsync
end
end)
task.spawn(function()
while true do
task.wait(set.ServerListUpdatePeriod)
updateServerMemoryStore()
end
end)
I had a task.spawn while loop to test if the memory store was being updated corrected but I ran into some sorta strange behaviour with :ListItemsAsync. :GetAsync given the server’s jobId will always report the correct information but :ListItemsAsync will only return the server’s data only if :UpdateAsync had been called since the previous iteration (and occasionally it would return the correct data a second time) before returning to call an empty list.
this is with the ServerListUpdatePeriod being 3 seconds for testing purposes. Note that I have only tested this in studio.
Now it does make sense that roblox would only send back data from a memory store that has been changed, In the memory’s queue documentation it talks about an “invisibility timeout” but I don’t believe that’s related, there’s no documentation in ListItemsAsync that states that this occurs so I want to double check that this isn’t my code or a studio thing.
This is not critical to me, I can just manually :GetAsync to check if a server has been deleted and have a big persistent list of all skimmed from :ListItemsAsync, but I want to make sure my understanding of memory stores is correct or if the issue is on my end or in my code.
