Christian Posta

About 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.

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From inside the code: Camel Routing Engine Part I

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 ...
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ActiveMQ Message Priorities: How it works

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 ...
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ActiveMQ Clustering, Durable Subscribers, and Virtual Topics to the rescue

So you want to do publish-subscribe with ActiveMQ across distributed topics and be reliable. You can just use durable subscriptions, right? Well, you could, but if you’re using clustering ...
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Apache Apollo REST API

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 ...
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ActiveMQ: Understanding Memory Usage

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 ...
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Benchmarking JMS layer with JMSTester

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 ...
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Guaranteed messaging for topics, the JMS spec, and ActiveMQ

Recently a customer asked me to look closer at ActiveMQ’s implementation of “persistent” messages, how it applies to topics, and what happens in failover scenarios when there ...
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Managing large deployments of MQ and ESB with Fuse Fabric, Part I

FuseSource just recently released enterprise versions of their distributions of ActiveMQ and ServiceMix. Some of the top features include incremental patching, custom platform installers, ...
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ActiveMQ Network Connectors

This post is more for me and any ActiveMQ contributors that may be interested in how the Network Connectors work for ActiveMQ. I recently spent some time looking at the code and thought ...
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Understanding how OSGI bundles get resolved

I’d like to review how OSGI bundles get resolved and use Apache Karaf to demonstrate. Karaf is a full-featured OSGI container based on the Apache Felix kernel and is the corner stone ...
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