b23_src/project/model/character.lua

local skynet = require "skynet"
require "skynet.manager"
local spawn = require "model.spawn"

local character = { }
function character.loadfrom(metadata)
  local usercenter = skynet.localname(".usercenter")
  local skynet_call = skynet.call
  local skynet_sleep = skynet.sleep

  local trigger = {}
  local t = spawn().loadfrom(metadata)
  rawset(t, "persist", function(k, v)
    trigger[k] = v
  end)

  local k = assert(t.uid)
  local function flushall()
    -- Execute all asynchronous setter
    local tmp = trigger
    trigger = {}
    for _, f in pairs(tmp) do
      f()
    end

    -- Serialize dirty data to array
    local pkg = t.pack(k)
    if pkg then
      -- Save data to database
      skynet_call(usercenter, "lua", "batch_save", pkg)
    end
  end
  character.flushall = flushall
  setmetatable(character, t)

  skynet.fork(function()
    while true do
      flushall()
      skynet_sleep(300)
    end
  end)
  return character
end

return character