【性能调优】getplayvar 的调用频次：变量读取的批量优化

---调用的频次统计：热点的定位
local CallStat = { count = 0, keys = {} }

local rawGet = getplayvar
getplayvar = function(actor, model, key)
    CallStat.count = CallStat.count + 1
    CallStat.keys[key] = (CallStat.keys[key] or 0) + 1
    return rawGet(actor, model, key)
end

setontimerex(104, 60)
function CallStat.report()
    Ops.log(("getplayvar 调用/分钟: %d"):format(CallStat.count))
    local top = {}
    for k, n in pairs(CallStat.keys) do
        top[#top + 1] = { k = k, n = n }
    end
    table.sort(top, function(a, b) return a.n > b.n end)
    for i = 1, math.min(5, #top) do
        Ops.log(("Top%d %s x%d"):format(i, top[i].k, top[i].n))
    end
    CallStat.count = 0
    CallStat.keys = {}
end

---批量读取：一次取回一组变量
function Vars.batch(actor, model, keyList)
    local out = {}
    for _, key in ipairs(keyList) do
        out[key] = getplayvar(actor, model, key)
    end
    return out
end

---战斗结算的快照：进战斗时一次取齐
function Combat.snapshot(actor)
    local snap = Vars.batch(actor, 2, {
        "Lifesteal", "CritRate", "IceResist",
        "PKValue", "MagicDodge",
    })
    -- 会话内缓存，结算读快照不再逐次调用
    Combat.cache[actor] = snap
    return snap
end