2014.8.12-AKKA和Actor model 分布式开发环境学习小结

作者分享了一年的AKKA学习经历,包括使用Java编写程序、官方文档阅读、书籍《AKKAEssentials》的学习、编译配置、版本升级、多服务器集群部署等方面的经验。介绍了两种编译方式:使用sbt命令行和maven插件,并提供了相关链接和教程。

学习使用AKKA 断断续续有一年了。目前还是习惯用java来写akka下面的程序。对于原生的scala还是没有时间和兴趣去学习它。 毕竟学习一门语言需要兴趣和时间的。 


AKKA学习资源还是不算丰富。 看过最多的就是官方的编程手册,还有就是AKKA Essentials 这两本。  自己动手写的程序还不算多,也放在github上面。 另外,在akka编译配置、升级版本上,以及部署多台服务器组建akka cluster 方面花费了不少时间。因为项目需要,上周重新在办公室用两台mac台式机和一台thinkpad t400组建了一个akka cluster 分布式开发环境。


akka项目编译上有两种方法:

第一、 用sbt ,这个是akka 官方推荐的方法,可以用sbt生成Eclipsse项目,然后导入到Eclipse里面,可以运行。 但是我的编译还是通过sbt 命令行的方式来做的。 如果大家有好的方法,请指正。 

sbt的安装方法参考:http://www.scala-sbt.org/download.html

how to write a scala file , build and run  with sbt.
http://www.scala-sbt.org/0.13/tutorial/Hello.html

akka:http://akka.io/

scala for eclipse IDE bundle : http://scala-ide.org/  (也推荐这个集成开发工具,内含编译所需要的akka actor 和 scala library)


第二、是用maven, 这是akka essentials 这本书所采用的。 我亲自实验过,可以编译akka 2.0.5, 2.1.2的旧有项目。 而且这本书的大多数例子,我都验证过。 所以,如果是想从头到尾、编译调试程序,不妨试试maven 的elipse 插件。

安装mvn  http://maven.apache.org/download.cgi 然后在readme安装步骤做。

Akka-Essentials 源代码 https://github.com/write2munish/Akka-Essentials

参考: 

Maven实战(三)Eclipse构建Maven项目
http://tangyanbo.iteye.com/blog/1503782



snailjob连接服务端报错2025-05-28 10:12:59 [snail-job-grpc-client-executor-127.0.0.1-1] ERROR c.a.s.c.c.handler.ClientRegister - heartbeat check requestId:[0] message:[INTERNAL: http2 exception]客户端报错2025-05-28 10:25:16 [NETTY_ACTOR_SYSTEM-akka.actor.netty-receive-request-dispatcher-14] ERROR c.a.s.s.c.r.s.RequestHandlerActor - http request error. [] com.aizuda.snailjob.server.common.exception.SnailJobServerException: Token authentication failed. [namespace:null groupName:null token:null] at com.aizuda.snailjob.server.common.rpc.server.RequestHandlerActor.doProcess(RequestHandlerActor.java:84) at com.aizuda.snailjob.server.common.rpc.server.RequestHandlerActor.lambda$createReceive$0(RequestHandlerActor.java:63) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:24) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:20) at scala.PartialFunction.applyOrElse(PartialFunction.scala:214) at scala.PartialFunction.applyOrElse$(PartialFunction.scala:213) at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:20) at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:269) at akka.actor.Actor.aroundReceive(Actor.scala:537) at akka.actor.Actor.aroundReceive$(Actor.scala:535) at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:220) at akka.actor.ActorCell.receiveMessage(ActorCell.scala:579) at akka.actor.ActorCell.invoke(ActorCell.scala:547) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:270) at akka.dispatch.Mailbox.run(Mailbox.scala:231) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) at java.base/java.lang.Thread.run(Thread.java:1583) 2025-05-28 10:25:16 [NETTY_ACTOR_SYSTEM-akka.actor.default-dispatcher-10] ERROR akka.actor.OneForOneStrategy - Json转对象失败 参数: com.aizuda.snailjob.common.core.exception.SnailJobCommonException: Json转对象失败 参数: at com.aizuda.snailjob.common.core.util.JsonUtil$JsonMapper.toJavaObject(JsonUtil.java:285) at com.aizuda.snailjob.common.core.util.JsonUtil.parseObject(JsonUtil.java:53) at com.aizuda.snailjob.server.common.rpc.server.RequestHandlerActor.lambda$createReceive$0(RequestHandlerActor.java:66) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:24) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:20) at scala.PartialFunction.applyOrElse(PartialFunction.scala:214) at scala.PartialFunction.applyOrElse$(PartialFunction.scala:213) at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:20) at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:269) at akka.actor.Actor.aroundReceive(Actor.scala:537) at akka.actor.Actor.aroundReceive$(Actor.scala:535) at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:220) at akka.actor.ActorCell.receiveMessage(ActorCell.scala:579) at akka.actor.ActorCell.invoke(ActorCell.scala:547) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:270) at akka.dispatch.Mailbox.run(Mailbox.scala:231) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) at java.base/java.lang.Thread.run(Thread.java:1583) Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: No content to map due to end-of-input at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); line: 1] at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59) at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:5008) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4910) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3860) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3828) at com.aizuda.snailjob.common.core.util.JsonUtil$JsonMapper.toJavaObject(JsonUtil.java:283) ... 18 common frames omitted 2025-05-28 10:25:16 [NETTY_ACTOR_SYSTEM-akka.actor.default-dispatcher-10] INFO akka.actor.RepointableActorRef - Message [akka.dispatch.sysmsg.Recreate] from Actor[akka://NETTY_ACTOR_SYSTEM/user/$e#607696578] to Actor[akka://NETTY_ACTOR_SYSTEM/user/$e#607696578] was not delivered. [5] dead letters encountered. If this is not an expected behavior then Actor[akka://NETTY_ACTOR_SYSTEM/user/$e#607696578] may have terminated unexpectedly. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'. 2025-05-28 10:25:16 [NETTY_ACTOR_SYSTEM-akka.actor.default-dispatcher-10] ERROR akka.actor.OneForOneStrategy - Json转对象失败 参数: com.aizuda.snailjob.common.core.exception.SnailJobCommonException: Json转对象失败 参数: at com.aizuda.snailjob.common.core.util.JsonUtil$JsonMapper.toJavaObject(JsonUtil.java:285) at com.aizuda.snailjob.common.core.util.JsonUtil.parseObject(JsonUtil.java:53) at com.aizuda.snailjob.server.common.rpc.server.RequestHandlerActor.lambda$createReceive$0(RequestHandlerActor.java:66) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:24) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:20) at scala.PartialFunction.applyOrElse(PartialFunction.scala:214) at scala.PartialFunction.applyOrElse$(PartialFunction.scala:213) at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:20) at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:269) at akka.actor.Actor.aroundReceive(Actor.scala:537) at akka.actor.Actor.aroundReceive$(Actor.scala:535) at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:220) at akka.actor.ActorCell.receiveMessage(ActorCell.scala:579) at akka.actor.ActorCell.invoke(ActorCell.scala:547) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:270) at akka.dispatch.Mailbox.run(Mailbox.scala:231) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) at java.base/java.lang.Thread.run(Thread.java:1583) Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: No content to map due to end-of-input at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); line: 1] at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59) at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:5008) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4910) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3860) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3828) at com.aizuda.snailjob.common.core.util.JsonUtil$JsonMapper.toJavaObject(JsonUtil.java:283) ... 18 common frames omitted
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