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h1. Akka Actor Kernel:
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__RESTful Distributed Persistent Transactional Actors__
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h1. Introduction
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The Akka kernel implements a unique hybrid of:
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* The Actor model (Actors and Active Objects)
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** Asynchronous, non-blocking highly concurrent components.
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** Supervision with "let-it-crash" semantics. Components are loosely coupled and restarted upon failure.
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* Software Transactional Memory (STM).
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* BASE persistence - Pluggable Eventually Consistent distributed scalable persistent storage.
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* Remoting - Distributed services.
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* REST - JAX-RS binding.
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h2. Here is a short overview
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h3. The Actor model and supervisor hierarchies
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"Actors":http://en.wikipedia.org/wiki/Actor_model with "Erlang OTP-style supervisors":http://www.erlang.org/doc/design_principles/sup_princ.html#5 and "embrace failure/let-it-crash" semantics to allow implementation of asynchronous, non-blocking and highly fault-tolerant systems. Sort of "SEDA":http://www.eecs.harvard.edu/~mdw/proj/seda/ in a box with highly configurable and monitorable (JMX and w3c) thread pools and message queues.
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h3. Software Transactional Memory (STM)
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"Software Transactional Memory (STM)":http://en.wikipedia.org/wiki/Software_transactional_memory for composable message flows. Distributed transactions will come very soon, backed up by "ZooKeeper":http://hadoop.apache.org/zookeeper/. The STM works with both persistent datastructures and in-memory datastructures (see below).
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h3. BASE: Eventually Consistent Distributed persistence
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Akka provides a "Eventually Consistent":http://www.allthingsdistributed.com/2008/12/eventually_consistent.html Transactional Persistent Map, Vector and Ref. Backed up by the "Cassandra":http://incubator.apache.org/cassandra/ highly scalable, eventually consistent, distributed, structured key-value store. Akka will add support for "Terracotta":http://terracotta.org, "Redis":http://code.google.com/p/redis/, "Memcached":http://www.danga.com/memcached/, "Voldemort":http://project-voldemort.com/, "Tokyo Cabinet/Tyrant":http://tokyocabinet.sourceforge.net/ and "Hazelcast":http://www.hazelcast.com/ shortly.
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New nodes can be added and removed on the fly to support true scaling of cluster. The addition of Terracotta and Hazelcast will allow for atomic (ACID) transactions (non-BASE).
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h3. REST
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Actors can be exposed as "REST":http://en.wikipedia.org/wiki/Representational_State_Transfer services through "JAX-RS":https://jersey.dev.java.net/.
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h3. Remoting
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Actors can be defined and started on remote nodes, supporting both remote failures and supervision/linking. Enabling another dimension of fault-tolerance.
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h3. Java and Scala API
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Both a Java API through Active Objects and annotations as well as a Scala API with Erlang-style Actors with pattern matching etc.
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h3. Microkernel
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Akka has a microkernel that embeds the Actor management, Persistence service, REST integration, JMX management and Remote service. Simply drop your application in the /deploy directory and start up the kernel and you should be able to access your Actors through REST.
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h2. Documentation
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Akka has pretty thorough "reference documentation":https://github.com/jboner/akka/wikis. Covering examples, APIs and configuration.
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h2. Distribution
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The latest distribution can be found in the "downloads section":https://github.com/jboner/akka/downloads
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h2. License
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<pre>
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This software is licensed under the Apache 2 license, quoted below.
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Copyright 2009 Scalable Solutions AB <http://scalablesolutions.se>
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Licensed under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy of
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the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations under
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the License.
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</pre>
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h1. Akka: RESTful Distributed Persistent Transactional Actors
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h3. "http://akkasource.org":http://akkasource.org
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Akka implements a unique hybrid of:
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* The Actor model (Actors and Active Objects), which gives you:
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** Concurrency (high-level and simple)
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** Asynchronous, non-blocking and highly performant components.
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** Supervision with "let-it-crash" semantics. Components are loosely coupled and restarted upon failure.
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* Software Transactional Memory (STM).
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* BASE and ACID persistence - Pluggable Eventually Consistent or ACID distributed scalable persistent storage.
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* Remoting - Distributed services with supervision and error management
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* REST (JAX-RS) and Comet bindings.
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* Monitoring and Management
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Akka can be used in two different ways:
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* As a library: used by a web app, to be put into ‘WEB-INF/lib’
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* As a kernel: stand-alone kernel, embedding the servlet container
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See the "Use-case and Deployment Scenarios":http://wiki.github.com/jboner/akka/use-case-and-deployment-scenarios for details.
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h1. What's Akka all about? Why should I care?
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If you are new to Akka then I suggest you start with either the:
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* "High Level View":http://wiki.github.com/jboner/akka/modules-the-high-level-view; which is outlining the different modules in Akka.
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* "Use-case and Deployment Scenarios":http://wiki.github.com/jboner/akka/use-case-and-deployment-scenarios; outlining how and in which use-case and deployment scenarios can I use Akka?
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* "Examples":http://wiki.github.com/jboner/akka/examples; showing how to build a RESTful, transactional, persistent Active Object and Actor.
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After that you can dive into the "Reference Manual":http://wiki.github.com/jboner/akka/akka-reference-manual.
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h1. Documentation
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Akka has pretty thorough "reference documentation":https://github.com/jboner/akka/wikis. Covering examples, APIs and configuration.
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h1. Distribution
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The latest distribution can be found in the "downloads section":https://github.com/jboner/akka/downloads
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h1. Mailing List
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If you have questions and/or feedback: please sign up to the Akka User mailing list:
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"http://groups.google.com/group/akka-user":http://groups.google.com/group/akka-user
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h1. Professional Support
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Scalable Solutions AB is providing a variety of professional support packages for Akka, please visit their website for details:
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"http://scalablesolutions.se":http://scalablesolutions.se
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h1. License
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<pre>
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This software is licensed under the Apache 2 license, quoted below.
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Copyright 2009 Scalable Solutions AB <http://scalablesolutions.se>
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Licensed under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy of
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the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations under
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the License.
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</pre>
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