【性能调优】行会成员遍历的缓存策略：百人会战的消息下发

---行会在线成员的缓存视图
local memberCache = {}
function Guild.onlineView(guildId)
    local view = memberCache[guildId]
    if not view or os.time() - view.at > 5 then
        local online = {}
        for _, name in ipairs(Guild.rawMembers(guildId)) do
            local actor = getplayerbyname(name)
            if actor and actor:IsOnline() then
                online[#online + 1] = actor
            end
        end
        view = { list = online, at = os.time() }
        memberCache[guildId] = view
    end
    return view.list
end

---行会战令下发：复用缓存视图
function GuildWar.sendOrder(guildId, text)
    for _, actor in ipairs(Guild.onlineView(guildId)) do
        sendmsg(actor, 1, "【战令】" .. text)
    end
    GuildLog.write(guildId, "war_order", text)
end