【性能调优】地图流转：切图高峰的对象复用

-- 对象池：取用与归还
local pools = {}
local function acquire(kind)
    local pool = pools[kind]
    if pool == nil then
        pool = {free = {}}
        pools[kind] = pool
    end
    local obj = table.remove(pool.free)
    if obj == nil then
        obj = {kind = kind, inited = false}
    end
    return obj
end
local function release(kind, obj)
    obj.inited = false
    local pool = pools[kind]
    pool.free[#pool.free + 1] = obj
end

-- 还池清场：脏数据防线
local player = class(actor)
local function releaseViewList(player, viewObj)
    for i = 1, #viewObj.list do
        viewObj.list[i] = nil
    end
    viewObj.count = 0
    viewObj.dirty = false
    release("viewlist", viewObj)
end
local function acquireViewList(player)
    local viewObj = acquire("viewlist")
    if viewObj.count ~= 0 or #viewObj.list ~= 0 then
        sendmsg(player, 1, 0, "系统检测到数据残留，已强制清空。")
        viewObj.count = 0
        viewObj.list = {}
    end
    viewObj.inited = true
    return viewObj
end