Akka 2.4 M2 发布,Actor 开发模型库
腾讯SNG夏日招聘集结号:200个空缺岗位,JAVA、C++、云计算、Android……Akka 2.4 M2 发布,此版本包括一些 2.4-M1 的改进:
[*] incorporate Patrik’s akka-data-replication under the new module name akka-distributed-data-experimental (see akka-data-replicationmigration guide), the Distributed Data module is useful for sharing eventually consistent data (CRDTs) between nodes in an Akka Cluster
[*] improved support for Akka Persistence event migrations by Serializer with String Manifest and Event Adapters
[*] make Akka Persistence failure handling more robust and support rejections of events
[*] Persistent FSM, thanks to an awesome contribution from leonidb
[*] various improvements in Akka Persistence aiming to finalize its APIs, refer to the migration guide or closed persistence tickets for details
[*] use custom failure detection in Cluster Client to avoid quarantining in case of transient network failures
[*] support graceful shutdown in Cluster Sharding
[*] various API and configuration improvements of Cluster Sharding, Cluster Singleton, Distributed PubSub and Cluster Client
Akka 2.4 未来计划
Akka 2.4.0-RC1 将会包括的新特性:
[*] complete the Java API and the documentation for Akka Typed
[*] finalize Akka Persistence on the Write Side (i.e. PersistentActor will be non-experimental; the work on the Read Side will be deferred until Akka 2.5)
[*] incorporate Streams & HTTP once ready (to become an experimental module, as usual)
更多改进内容请看发行说明。
下载:https://github.com/akka/akka/archive/v2.4-M2.zip。
Akka 是一个用 Scala 编写的库,用于简化编写容错的、高可伸缩性的 Java 和 Scala 的 Actor 模型应用。
Actor模型并非什么新鲜事物,它由Carl Hewitt于上世纪70年代早期提出,目的是为了解决分布式编程中一系列的编程问题。其特点如下:
[*] 系统中的所有事物都可以扮演一个Actor
[*] Actor之间完全独立
[*] 在收到消息时Actor所采取的所有动作都是并行的,在一个方法中的动作没有明确的顺序
[*] Actor由标识和当前行为描述
[*] Actor可能被分成原始(primitive)和非原始(non primitive)类别
[*] 非原始Actor有
[*] 由一个邮件地址表示的标识
[*] 当前行为由一组知识(acquaintances)(实例变量或本地状态)和定义Actor在收到消息时将采取的动作组成
[*] 消息传递是非阻塞和异步的,其机制是邮件队列(mail-queue)
[*] 所有消息发送都是并行的
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