【性能调优】排行快照：榜单数据的定时固化

-- 排行快照：定时生成
local player = class(actor)
local function generateRankSnapshot(player, rankType)
    local data = {}
    for i = 1, 100 do
        local name = getplayvar(player, "HUMAN", "RankData_" .. rankType .. "_" .. i)
        if name and name ~= "" then
            data[#data + 1] = {rank = i, name = name}
        end
    end
    table.sort(data, function(a, b) return a.rank < b.rank end)
    setsysvarex("RankSnap_" .. rankType, os.date("%Y%m%d%H%M"), true)
    sendmsg(player, 1, 0, rankType .. " 排行快照已生成，共 " .. #data .. " 条。")
end

-- 排行快照：缓存查询
local player = class(actor)
local localSnapVersion = 0
local function queryRank(player, rankType)
    local snapVer = getsysvar("RankSnap_" .. rankType)
    if snapVer == localSnapVersion then
        sendmsg(player, 1, 0, "排行数据未变化，返回缓存。")
        return
    end
    localSnapVersion = snapVer
    for i = 1, 10 do
        local name = getplayvar(player, "HUMAN", "RankData_" .. rankType .. "_" .. i)
        if name and name ~= "" then
            sendmsg(player, 1, 0, i .. ". " .. name)
        end
    end
end