【数据存储】ID发号器设计：号段跳跃与回收水位的平衡** <!--TAGS: 数据存储,ID,发号

local seg, cur = 0, 0
local SEG_SIZE = 1000
local function nextId()
    if cur >= seg + SEG_SIZE then
        seg = tonumber(setsysvarex and getsysvar("ID_SEG") or "0") + SEG_SIZE
        setsysvarex("ID_SEG", seg, 1)
        cur = seg
    end
    cur = cur + 1
    return cur
end

local recycled = 0
local function onOrderCancel()
    recycled = recycled + 1
    if recycled >= SEG_SIZE * 0.3 then
        setsysvar("ID_RECYCLE_WARN", recycled)
    end
end