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The Eventsourced library adds scalable actor state persistence and at-least-once message delivery guarantees to Akka. With Eventsourced, stateful actors: - Persist received messages by appending them to a log (journal) - Project received messages to derive current state - Usually hold current state in memory (memory image) - Recover current (or past) state by replaying received messages (during normal application start or after crashes) - Never persist current state directly (except optional state snapshots for recovery time optimization)

"NSQ is a realtime message processing system designed to operate at bitly's scale, handling billions of messages per day."

"Protostuff is the stuff that leverages google's protobuf. A serialization library with built-in support for forward-backward compatibility (schema evolution) and validation. available formats: protostuff (native) graph (protostuff with support for cyclic references. See SerializingObjectGraphs) protobuf json smile (binary json useable from the protostuff-json module) xml yaml (ser only) kvp (binary uwsgi header) support for messages that are generated by the protostuff-compiler (java_bean) cyclic references via graph format see CompilerOptions for more customized compilation of .proto files support for existing pojos (See runtime schemas) cyclic references via graph format polymorphic (a nested message can be an interface/abstract class or even java.lang.Object) support for existing protoc-generated java messages see the io instructions for json, xml, yaml) no support for cyclic references (limitation of the builder pattern) Interoperability across various mobile platforms android kindle j2me (protostuff-me module) Transcoding support converts one encoding to another. See PipeUsage. Source and Sink protostuff, protobuf, json, json-numeric, smile, smile-numeric, xml Sink only yaml "

"A typical Java EE application consists of an application server, such as WildFly, and a database, such as MySQL. In addition, you might have a separate front-end tier, say Apache, for load balancing a number of application server. A caching layer, such as Infinispan, may be used to improve overall application performance. Messaging system, such as ActiveMQ, may be used for processing queues. Both the caching and messaging components could be setup as a cluster for further scalability. This Tech Tip will show some simple Docker recipes to configure your containers that use application server and database. Subsequent blog will cover more advanced recipes that will include front-end, caching, messaging, and clustering. "

 Ø  The socket library that acts as a concurrency framework.  Ø  Faster than TCP, for clustered products and supercomputing.  Ø  Carries messages across inproc, IPC, TCP, and multicast.  Ø  Connect N-to-N via fanout, pubsub, pipeline, request-reply.  Ø  Asynch I/O for scalable multicore message-passing apps.  Ø  Large and active open source community.  Ø  30+ languages including C, C++, Java, .NET, Python.  Ø  Most OSes including Linux, Windows, OS X.  Ø  LGPL free software with full commercial support from iMatix.

Nux is an open-source Java toolkit making efficient and powerful XML processing easy. It is geared towards embedded use in high-throughput XML messaging middleware such as large-scale Peer-to-Peer infrastructures, message queues, publish-subscribe and matchmaking systems for Blogs/newsfeeds, text chat, data acquisition and distribution systems, application level routers, firewalls, classifiers, etc.

"Apache Hama is a pure BSP (Bulk Synchronous Parallel) computing framework on top of HDFS (Hadoop Distributed File System) for massive scientific computations such as matrix, graph and network algorithms. Today, many practical data processing applications require a more flexible programming abstraction model that is compatible to run on highly scalable and massive data systems (e.g., HDFS, HBase, etc). A message passing paradigm beyond Map-Reduce framework would increase its flexibility in its communication capability. Bulk Synchronous Parallel (BSP) model fills the bill appropriately. Some of its significant advantages over MapReduce and MPI are: * Supports message passing paradigm style of application development * Provides a flexible, simple, and easy-to-use small APIs * Enables to perform better than MPI for communication-intensive applications * Guarantees impossibility of deadlocks or collisions in the communication mechanisms"

"Service Component Architecture (SCA) is a set of specifications which describe a model for building applications and systems using a Service-Oriented Architecture (SOA). SCA extends and complements prior approaches to implementing services, and SCA builds on open standards such as Web services. SCA is based on the idea that business function is provided as a series of services, which are assembled together to create solutions that serve a particular business need. These composite applications can contain both new services created specifically for the application and also business function from existing systems and applications, reused as part of the composition. SCA provides a model both for the composition of services and for the creation of service components, including the reuse of existing application function within SCA compositions. SCA aims to encompass a wide range of technologies for service components and for the access methods which are used to connect them. For components, this includes not only different programming languages, but also frameworks and environments commonly used with those languages. For access methods, SCA compositions allow for the use of various communication and service access technologies that are in common use, including, for example, Web services, messaging systems and Remote Procedure Call (RPC)."

"Efficient, scalable, rock-solid, and flexible Java implementation of the Short Messaging Peer to Peer Protocol (SMPP)."

"Heluna offers a unique SaaS based anti-spam solution that processes millions of e-mail messages  daily. Heluna turned to the Typesafe Stack - made up of Scala, Akka and Play Framework - in order  to future-proof the platform, and allow it to easily scale out to process well into the hundreds of  millions of e-mails."

"Project Honey Pot is the first and only distributed system for identifying spammers and the spambots they use to scrape addresses from your website. Using the Project Honey Pot system you can install addresses that are custom-tagged to the time and IP address of a visitor to your site. If one of these addresses begins receiving email we not only can tell that the messages are spam, but also the exact moment when the address was harvested and the IP address that gathered it."

"Package mangos is an implementation in pure Go of the SP ("Scalability Protocols") messaging system. This makes heavy use of go channels, internally, but it can operate on systems that lack support for cgo."

"The akka-patterns project is a dumping ground for lessons learnt on a variety of Scala / Akka / Spray topics. At the end of 5 months working on real world (commercial) projects, that were originally based on the akka-patterns architecture, Sam Halliday (@fommil) was asked to document the lessons learnt: Milestone: Lessons Learnt Pull Request: Lessons Learnt This short document is a summary of the highlights from the pull request."

Es muy importante que estudiemos este documento y proyecto todos los que estamos trabajando con akka y/o spray.

Una simple traducción de este post podría ser nuestra largamente necesitada convención sobre cómo escribir los comentarios de commits.

Hello everybody, I'm developing a custom authentication module. As part of the process I have to redirect the user to a second site and then the second site redirect the user back to the custom module. For this I'm using the RedirectCallback, but while debugging I noticed that the module gets initialized a second time after the users comes back from the second site. I was wondering if this is the expected behavior or if I'm doing something wrong. This is how the callbacks are defined in the xml.