Akka（java），非阻止广播给所有孩子 [英] Akka (java), non blocking broadcast to all children

问题描述

假设我有一个地区演员，每个地区都有一定数量的人。你如何向每个人广播一条消息，知道人们的名单可以随着时间的推移而改变，广播路由器似乎是选择，但问题是他们有最大数量的路由，而且我不能动态地将人们附加到一个路由器。

Let's say I have a Region Actor, and each region has a certain number of people inside it. How do you broadcast a message to everyone, knowing that the list of people can change over time, broadcast routers seems to be the choice, but then the problem is that they have a maximum number of routees, and that I cannot dynamically append people to a router.

我的问题是：我知道有一个EventBus，我可以订阅我的人员到活动总线，但我不希望他们接收发布的每条消息，我希望他们收到该地区的消息。

My question is: I know there is an EventBus, I could subscribe my people to the event Bus, but I dont want them to recieve every message posted, I want them to recieve the messages of the region.

现在在akka，我们必须创建一个具有一定数量路由的路由器，
示例：

right now in akka, we have to create a router with a certain number of routees, example :

Router router = new router(person1, person2)

这很糟糕，因为在开始时该地区没有人，我不知道将加入我所在地区的人。

this is bad because At the beggining there is no one in the region, i don't know the people who will join my region.

有没有办法制作一种动态路由器：
例如：

is there a way to make a kind of dynamic router : example :

Region region = new region()
region.router = new Router()
Person person1 = new Person()
region.router.subscribe(person1);     
region.router.tell("hello",null);

推荐答案

您的解决方案已经非常接近：您需要路由器，但不是特制的预制件之一。相反，只需写一个向订阅者转发消息的演员：

Your solution is already very close: you need a router, but not one of the special-made pre-fabricated ones. Instead just write an actor which forwards messages to subscribers:

class MyRouter extends UntypedActor {
  final Set<ActorRef> subscribers = new HashSet<ActorRef>();

  @Override public void onReceive(Object msg) {
    if (msg instanceof Subscribe) {
      subscribers.add(getSender());
    } else if (msg instanceof Unsubscribe) {
      subscribers.remove(getSender());
    } else {
      for (ActorRef target: subscribers) {
        target.tell(msg, getSender());
      }
    }
  }
}

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