Home » Author Archives: Christian Posta (page 3)

Author Archives: Christian Posta

Christian Posta
Christian is a Principal Consultant at FuseSource specializing in developing enterprise software applications with an emphasis on software integration and messaging. His strengths include helping clients build software using industry best practices, Test Driven Design, ActiveMQ, Apache Camel, ServiceMix, Spring Framework, and most importantly, modeling complex domains so that they can be realized in software. He works primarily using Java and its many frameworks, but his favorite programming language is Python. He's in the midst of learning Scala and hopes to contribute to the Apache Apollo project.

Lessons learned: ActiveMQ, Apache Camel and connection pooling

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Every once in a while, I run into an interesting problem related to connections and pooling with ActiveMQ, and today I’d like to discuss something that is not always very clear and could potentially cause you to drink heavily when using ActiveMQ and Camel JMS. Not to say that you won’t want to drink heavily when using ActiveMQ and Camel ...

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JBoss Fuse 6.1 + HawtIO Part I

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It’s Open Source! JBoss Fuse is an open-source ESB and is the evolution of Fuse ESB after the Red Hat acquisition of FuseSource. It’s open-source, Apache v2 Licensed, and fully supported by Red Hat. One of the best parts is, you can download it and play with it for free and the same bits supported in production or with a ...

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Light-weight, open-source integration: Apache Camel or Spring Integration?

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First of all, for full disclosure, for the last 1.5 years, I’ve been working as a consultant for FuseSource (now Red Hat) supporting SOA and Integration projects for large and small companies in diverse verticals from retail, shipping, banking/finance, health, etc etc. My specialty has been architecting solutions with high scalability and throughput demands using some of the best open-source ...

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From inside the code: Camel Routing Engine Part I

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So I’ve recently re-kindled my interest in how Apache Camel works. Camel is such a powerful integration tool and is very widely used, but anytime I put it to work, I can’t help but think “well, how the hell does it do all that!!” … guess I just have knack for not just accepting that it’s wonderful.. I want to ...

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ActiveMQ Message Priorities: How it works

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There’s usually a steady drip of questions on the mailing list surrounding ActiveMQ’s message-priority support as well as good questions about observed behaviors and “what’s really supported”? I hope to help you understand what happens under the covers and what levels of priority can be supported. The details could get gory for some. If you’re not interested in the details, ...

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Apache Apollo REST API

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Apache Apollo is a next-generation, high-performance, multi-protocol messaging broker built from the ground up to one day be a drop-in replacement of ActiveMQ 5.x. I have blogged about it in the past (Part I has already been published with part II on its way). Apollo’s non-blocking, asynchronous architecture allows it to be super fast and scale very well on multi-core ...

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ActiveMQ: Understanding Memory Usage

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As indicated by some recent mailing list emails and a lot of info returned from Google, ActiveMQ’s SystemUsage and particularly the MemoryUsage functionality has left some people confused. I’ll try to explain some details around MemoryUsage that might be helpful in understanding how it works. I won’t cover StoreUsage and TempUsage as my colleauges have covered those in some depth. ...

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Benchmarking JMS layer with JMSTester

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For most of the clients I’ve been to, scaling out a JMS messaging layer with ActiveMQ is a priority. There are a couple ways to achieve this, but without a doubt, creating benchmarks and analyzing an architecture on real hardware (or as my colleague Gary Tully says “asking the machine”) is step one. But what opensource options do you have ...

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