scala akka：演员是否记得它最终应该回复的内容？
在akka中，假设有一个线性的actor链，每个actor从上游接收消息，向下游发送自己的消息并等待回复，然后向上游发送回消息。当actor必须稍后回复上游actor时，它如何记住上游actor的句柄？
例如：
A sends message to B (b ! "msg1")
B sends message to C (c ! "msg2")
C replies to B (self.reply ! "msg3")
B replies to A <--- ???
基本上，B 如何记住 A 的句柄？此时执行 self.reply 将引用 C，因为 C 将当前消息发送给 B。
in akka suppose there is a linear chain of actors such that each actor receives a message from upstream, sends its own message downstream and waits for a reply, and then sends a message back upstream. how can the actor remember the handle of the upstream actor when it has to reply to that actor later?
for example:
A sends message to B (b ! "msg1")
B sends message to C (c ! "msg2")
C replies to B (self.reply ! "msg3")
B replies to A <--- ???
basically, how can B remember a handle for A? doing self.reply at this point would refer to C, since C sent the current message to B.
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参与者B必须更改C和A之间的回复消息吗？
如果没有，参与者B应该使用
B转发“msg”而不是B！ “消息”。这将保留发件人信息。当C使用回复时，答案会自动发送给A，而不经过B：A 向 B 发送消息（b !“msg”）B将消息转发给C（c转发“msg”）C 回复 A (self.reply !"msg3")如果是，则获取发件人 < code>ActorRef 并将其传递消息发送者引用。
例如，使用一个简单的元组：
这里我使用了一个元组，但如果您有更长的链，请传递一个
List[ActorRef]。继续前进时，您可以在前面添加发件人参考。当返回时，您回复列表头并沿着回复传递列表尾。编辑：考虑维克多的评论。
Must actor B change the reply message between C and A ?
If not, actor B should use
B forward "msg"instead ofB ! "msg". That will preserve the sender information. When C use reply, the answer is automatically sent to A without passing by B:A sends message to B (b ! "msg")B forward the message to C (c forward "msg")C replies to A (self.reply ! "msg3")If yes, get the sender
ActorRefand pass it along the message sender reference.For example, using a simple tuple:
Here I used a Tuple, but if you have a longer chain, pass a
List[ActorRef]. When going forward, you prepend senders refs. And when going back, you reply to the list head and pass the list tail along the reply.Edit: Taking Victor comment into account.