某页游erlang服务端广播算法效率好差，应该算是一个bug了吧

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每次都全局遍历全部在线玩家在某个场景的玩具ID，这样的算法，我不知道一个服能撑起多少人，优化一下，场景服务管理在他服务中的玩家，NPC，MON，效率会提升好几倍，只是代码会稍微复杂一点，没他写的优雅了！！

%%  获取要广播的范围用户ID
get_broadcast_id(Q, X0, Y0) ->
    AllUser = ets:match(?ETS_ONLINE, #ets_online{id = '$1',x = '$2', y='$3', scene = Q, _='_'}),<span style="color:#ff6666;"> %% 这句代码效率会很差的，而去执行的次数又多</span>
    XY2 = lib_scene:get_xy(X0, Y0),
    get_broadcast_id_loop(AllUser, XY2, []).

get_broadcast_id_loop([], _XY2, D) ->
    D;
get_broadcast_id_loop([[Id, X, Y]|T], XY2, D) ->
    XY = lib_scene:get_xy(X, Y),
    if
        XY == XY2 orelse XY == XY2 + 1 orelse XY == XY2 -1 orelse XY == XY2 -8 orelse XY == XY2 +8 orelse XY == XY2 -9 orelse XY == XY2 +9 orelse XY == XY2 -7  orelse XY == XY2+7 ->
            get_broadcast_id_loop(T, XY2, D++[Id]);
        true->
            get_broadcast_id_loop(T, XY2, D)
    end.

某页游erlang服务端广播算法效率好差，应该算是一个bug了吧

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原文地址：http://blog.csdn.net/gamesofsailing/article/details/42538233