InfoQ Homepage Messaging Content on InfoQ
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Article: Spectacular Scalability with Smart Service Contracts
Udi Dahan describes an experience implementing a new order system in which large size message passing was affecting the scalability and even bringing down servers in the system. The article describes how they diagnosed the problem and their solution, by "changing our service contracts and introducing stateful interactions we were able to manage the performance critical state of the system."
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WebSphere Updates: sMash, eXtreme Scale, Virtual Enterprise, Business Events
At IBM IMPACT this week, IBM announced a several new and re-randed upgraded products dealing with virtualization (Virtual Enterprise), clustering & caching (eXtreme Scale), complex event processing (Business Events), and RESTful web apps (sMash). InfoQ spoke to various execs and product managers to find out more.
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Integrating Flex 3.0 and RabbitMQ Using STOMP
Derek Wischusen shared his experiment that integrating RabbitMQ with a Flex 3 using an ActionScript 3 STOMP client. It's a demonstration of messaging oriented RIA application concept.
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POJO Messaging Architecture with Terracotta
Mark Turansky detailed his implementation of a message bus architecture using Terracotta and Java 5. Instead of using an MQ or JMS based deployment, Mark took advantage of the Terracotta architecture to create his POJO message bus. This allowed for a clean, simple, and inexpensive infrastructure solution to his message needs.
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Specialized Message Patterns for SOA
Adobe have just published a document on SOA message exchange patterns. It also contains a good primer on SOA principles. Duane Nickull, the chair of the OASIS SOA Reference Model Technical Committee, is a co-author, making this well worth a look.
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More on RPC in Adobe Flex Applications with AMF, BlazeDS, and/or GraniteDS
Last week, Adobe made a major change to the Adobe Flex Platform with the announcement that much of LiveCycle Data Services is being open sourced in the BlazeDS project, including the AMF specification and code. This change should eliminate one of the final cost and licensing barriers for those considering adopting the Flex Platform.
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Designing for flexibility and robustness: Asynchronous message model, OOP and Functional Programming
According to Pragmatic Programmers it is preferable in OOP to avoid design based on returning values. Michael Feathers argues that it may also be better to use the asynchronous message model that might be instrumental for improving adaptability and robustness. This maps well to the Erlang model though opposing some of the principles of pure functional programming.
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Catching up with Esper: Event Stream Processing Framework
Esper is an event stream processing (ESP) and event correlation engine (CEP) that triggers actions when event conditions occurs among event streams - which can be thought of as a database turned upside down where statements are registered and data streams flow through. InfoQ caught up with Esper founders on recent project status, including BEA's use of Esper, and recent benchmarks.
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ESB-Oriented Architectures considered harmful
Bobby Woolf questions, with humor, the use of an ESB-Oriented Architecture approach when building a Service Oriented Architecture. This is an age old question that's worth revisiting in the light of the completion of WS-* standard stack.
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Building Complex Event Processing applications in Java with WebLogic Event Server
A look at how BEA's WebLogic Event Server simplifies building Complex Event Processing applications.
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Reliable Messaging in Ruby with AP4R
Shun'ichi Shinohara and Kiwamu Kato have been working on bringing reliable messging to Ruby with their own API & protocol project, based on previous experiences designing a Java-based high volume messaging framework. AP4R, Asynchronous Processing for Ruby, is an implementation of reliable asynchronous message processing, providing message queuing and message dispatching.
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BEA announces Real Time 2.0, WebLogic Event Server
BEA recently announced WebLogic Event Server, a Java application server designed for event-driven applications and WebLogic Real Time 2.0 a new release of BEA's real-time technology.
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On Intermediation in SOA
Nick Malik writes about "The Value of Intermediation in SOA", which started an interesting discussion. In his first blog post on the subject he asked the question: "Is it Service Oriented if the message cannot be intermediated?".
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Exploring Event Driven Architectures with Esper
At Java One Thomas Bernhardt and Alexandre Vasseur explained the concepts of event driven application servers and the Esper project. Event driven application servers are a new category of servers, proving a runtime and supporting infrastructure services (transport, security, event journaling, high availability, connectors, etc.) to servers designed to be able to process over 100,000 events/sec.
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Presentation: Event Patterns
Ian Cartwright presents some of his work (developed with Martin Fowler) on Event Patterns (recorded at JAOO), including: Event Sourcing, Event Collaboration, Parallel Model, and Retroactive Event. These patterns can be used in scenarios where a sequence of domain model changes may need to be recorded, reversed, corrected, or simply observed.