【数据存储】开服预热：热门数据的提前装载

---开服预热：热门数据的装载
setontimerex(97, 0)
function Warmup.run()
    local jobs = {
        { name = "排行榜",   fn = Warmup.ranks },
        { name = "商店货架", fn = Warmup.shops },
        { name = "传送点",   fn = Warmup.waypoints },
        { name = "预创角",   fn = Warmup.preRoles },
    }
    for _, job in ipairs(jobs) do
        local ok, err = pcall(job.fn)
        Ops.log(("预热[%s] %s"):format(
            job.name, ok and "完成" or "失败:" .. tostring(err)))
    end
end

---排行榜的预热：开门前的首屏数据
function Warmup.ranks()
    Cache.put("rank_level", DB.query(
        "SELECT name, level FROM roles " ..
        "ORDER BY level DESC LIMIT 50"))
end

---预热的校验：缓存命中率的开门验证
function Warmup.verify()
    -- 模拟开门的首波查询，验证命中
    local hit = 0
    local total = 0
    for _, q in ipairs(Warmup.probeQueries()) do
        total = total + 1
        if Cache.get(q) then hit = hit + 1 end
    end
    local rate = hit / total
    Ops.log(("预热命中率 %.0f%%"):format(rate * 100))
    return rate >= 0.9
end