Lua监听事件观察者模式(多个监听者监听)

fireEvent 产生事件，创建协程分发（在registerEventListener注册过的事件中通过事件名字找到对应的信息，然后执行对应模块的OnEvent函数）,多个地方都注册了同一个事件的话，则所有监视该事件的模块都会收到

-- 事件ID
-- 可配置与配置表中（TODO）
activity_manager.activityEventId = {}
activity_manager.activityEventId.EVENT_TEST = 1;

-- 事件表
local event_tb = {}

function activity_manager:registerEventListener(layerName, eventId, func)
    if type(eventId) ~= "number" then
        print('ROORR:: activityEventId 参数非法')
        return
    end

    if event_tb[eventId] ~= nil then
        local _samelayer = false
        for k, v in pairs(event_tb[eventId].monitor) do
            if v.layerName == layerName then
                print('WARNING:: eventId和layerName都一样前面的注册信息会被覆盖', eventId, layer)
                _samelayer = true
                v.func = func
            end
        end
        if not _samelayer then
            local _monitor = {}
            _monitor.layerName = layerName
            _monitor.func = func
            table.insert(event_tb[eventId].monitor, _monitor)
        end
    else
        event_tb[eventId] = {}
        event_tb[eventId].monitor = {}
        local _monitor = {}
        _monitor.layerName = layerName
        _monitor.func = func
        table.insert(event_tb[eventId].monitor, _monitor)
    end
end

function activity_manager:releaseEventListener(layerName, eventId)
    for v in pairs(event_tb[eventId].monitor) do
        if v.layerName == layerName then
            v = nil
        end
    end
end

function activity_manager:dispatchEvent(eventId, args)
    if type(eventId) ~= "number" then
        print('ROORR:: activityEventId 参数非法')
        return
    end

    if event_tb[eventId] == nil then
        print('ROORR:: activityEventId 参数不存在')
        return
    end

    for k, v in pairs(event_tb[eventId].monitor) do
        local func = v.func
        local layerName = v.layerName
        func(args)
    end
end

function activity_manager:fireEvent(eventId, args)
    if not event_tb or not next(event_tb) then return end
    local co = coroutine.create( function(eventId, args) 
        self:dispatchEvent(eventId, args)
    end)

    local status, msg = coroutine.resume(co, eventId, args)
    assert(status, msg)
end

function activity_manager:releaseEventListenerByName(layerName)
    for k, v in pairs(event_tb) do
        for index, _monitor in pairs(v.monitor) do
            if _monitor.layerName == layerName then
                v.monitor[index] = nil
            end
        end
    end
end