有没有办法在 erlang 中向远程节点发送闭包?

Is there a way to send a closure to remote node in erlang?

它接缝 erlang 只发送有趣的引用到远程节点。当尝试发送闭包时,它显然在调用模块中内联闭包,并将一个有趣的引用发送到远程节点的内联乐趣。这是测试:

-module(funserver).

-compile(export_all).

loop()->
receive {From, ping} ->
        error_logger:info_msg("received ping from ~p~n", [From]),
        From ! pong,
        loop();
    {From, Fun} when is_function(Fun) ->
        error_logger:info_msg("executing function ~p received from ~p~n", [Fun, From]),
        From ! Fun(),
        loop();
    M -> 
        error_logger:error_msg("received ~p, don't know what to do with it", [M])
end.

和客户端节点上的测试:

test_remote_node_can_execute_sent_clojure()->
    {ok, ModName, Binary} = compile:file(funserver, [verbose,report_errors,report_warnings, binary]),
    {module, ModName} = rpc:call(?other_node, code, load_binary, [ModName, atom_to_list(ModName), Binary]),
    Pid = spawn(?other_node, funserver, loop, []),
    OutVar = {"token with love from", node()},
    Pid ! {self(), fun()-> {OutVar, erlang:node()} end},
    receive Result -> 
        Result = {OutVar, node(Pid)}
    after 300 ->
              timeout
    end.

得到

Error in process <7162.123.0> on node servas@sharas with exit value:
{undef,[{#Fun<tests.1.127565388>,[],[]},
        {funserver,loop,0,[{file,"funserver.erl"},{line,12}]}]}
timeout

那么clojure可以发到远程节点吗?

您的示例的问题是客户端节点编译 funserver 模块并将其发送到远程节点 - 但该模块已经存在并正在执行,等待接收消息 - 但它没有发送 tests 模块,该模块实际上包含您发送的乐趣。

compile:file 行中,将 funserver 更改为 tests,它应该可以工作。


此外,您可以使用 code:get_object_code 而不是 compile:file,因为该模块已经编译并加载到本地节点中。