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Apache-2.0

#bakka

一种使用akka的方式,适用于分布式系统的构建

坐标

  <dependency>
      <groupId>org.beykery</groupId>
      <artifactId>bakka</artifactId>
      <version>1.0.6</version>
  </dependency>

问题

使用akka构建分布式应用,需要做一些配置上的修改,书写各种actor,确定路由并向指定的actor发送消息 ,期间要监听各种集群事件和actor的生命周期等。烦。

解决方案

bakka的思路是帮助开发者在一开始就尽力化简这些问题,只需要根据业务逻辑在指定actor里面书写处理业务 消息即可,当需要调用别的服务时,在已经找到的actor集合里面按照自己的路由方法发送消息。

使用

首先是要把bakka.conf放到resource下,bakka.system.name属性修改成你想要的名字,bakka.system.classpath修改成 你的应用程序里的actor包名,系统启动的时候,这个路径下的所有actor都将会被递归扫描并启动。roles也要修改为你 想启动的actor集合,比如有个actor叫Backend,要启动它,就把它填写到roles里面即可

@Bakka(service = "Backend")
public class Backend extends BaseActor
{

  @BakkaRequest
  public HI hi(HI hi)
  {
    System.out.println(hi+"......");
    return hi;
  }
}

上面这个actor(必须继承BaseActor),在@Bakka里面指定自己的服务名为Backend,如果bakka.conf里面roles集合里面有它, 则系统启动的时候,就会被自动启动;当它收到一个类型为HI的消息的时候,hi方法(带有@BakkaRequest注解)将会被调用 ,hi方法的返回(HI),将会自动被送往当前的sender(如果有)。

bakka使用protostuff来序列化消息。所有的消息都应该实现org.beykery.bakka.Serializable接口,否则将不会被protostuff 序列化。

处理消息的时候(比如hi方法里面),如果要传递一个消息给另一个actor则访问它的services属性获取一个actor并发送即可:

@Bakka(service = "Fronted",slaves = {"Backend"})
public class Fronted extends BaseActor
{
  @BakkaRequest
  public void hi(HI hi)
  {
    System.out.println(hi+"......");
    this.services.get("Backend").get(0).tell(hi, self());
  }

}

Fronted类的注解@Bakka声明了slaves(所依赖的其他actor),所以它就可以在services里面查找这些服务(Backend),这些服务 可能是本地的也可能是系统其他节点提供的actor,剩下的就是按照逻辑要求选择其一或更多actor并tell消息

当系统一些节点挂掉的时候,bakka会处理这些事情并把失效的actor从services里面清除掉;当一些节点up的时候,bakka会处理相关 actor(服务)的注册和监听;确保services会被正确更改。

结语

enjoy it.

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