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Speeding up ActiveMQ persistent messaging performance by 25x

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Apache ActiveMQ, JBoss A-MQ, and Red Hat Apache ActiveMQ is a very popular open-source messaging broker brought to you by the same people who created (and work on) Apache Karaf, Apache Camel, Apache ServiceMix, and many others. It has a vibrant community, is very flexible, and can be deployed in highly performant and highly available scenarios. At Red Hat (where ...

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Minor GC vs Major GC vs Full GC

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While working with the GC pause detection functionality in Plumbr I was forced to work my way through loads of articles, books and presentations about the subject. Throughout the journey, I was repeatedly confused about the (mis)use of the Minor, Major and Full GC events. This led to this blog post where I hope I manage to clear some of ...

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Build Binaries Only Once for Continuous Deployment

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What is Build Binaries Only Once? One of the fundamental principle of Continuous Delivery is Build Binaries Only Once, or in short BBOO. This means that the binary artifacts should be build once, and only once. These artifacts should then be stored in a repository manager, such as a Nexus Repository. Subsequent deploy, test, and release cycles should never attempt to build ...

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jOOQ vs. Slick – Pros and Cons of Each Approach

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Every framework introduces a new compromise. A compromise that is introduced because the framework makes some assumptions about how you’d like to interact with your software infrastructure. An example of where this compromise has struck users recently is the discussion “Are Slick queries generally isomorphic to the SQL queries?“. And, of course, the answer is: No. What appears to be ...

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Setup Local Nexus Repository and Deploying WAR File from Maven

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Maven Central serves as the central repository manager where binary artifacts are uploaded by different teams/companies/individuals and shared with rest of the world. Much like github, and other source code repositories, which are very effective for source code control, these repository managers also act as a deployment destination for your own generated binary artifacts. Setting up a local repository manager has several ...

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JVM Pressure – Context Switching Overhead

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Context Switching (CS) is a valuable service provided by the underlying Operating System. It prevents greedy processes from CPU hogging, time-shares CPU between multiple threads/tasks/processes to create an illusion of continuous progress. However, the suspension of the first process and scheduling of the second one requires the kernel to store the state of the first process and load the state ...

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The New Agile–Decisions, Decisions

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In the new knowledge economy, the winners are the ones who learn quickly. But learning means nothing, if it cannot be applied to the business. So the winners are the ones who learn, and use that knowledge, by deciding where to go, and what to do next. If decision making is the king maker, it can also come back to ...

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Balanced Abstraction Principle

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One of the things that make code complicated to read and understand is when the instructions inside a method are at different levels of abstraction. Let’s assume that our application only allows the logged-in user to see trips from her friends. If users are not friends, no trips should be displayed. An example:     public List<Trip> tripsByFriend(User user, User ...

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Journey to idempotency and temporal decoupling

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Idempotency in HTTP means that the same request can be performed multiple times with the same effect as if it was executed just once. If you replace current state of some resource with new one, no matter how many times you do so, in the end state will be the same as if you did it just once. To give ...

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Working with sass scripts in Grails 2.3.X

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Sass is one of the most mature, stable, and powerful professional grade CSS extension language available. Before we can use Sass, we need to set it up on our project. In grails-2.4.X, it is very easy to use sass through asset pipeline plugin. But with grails-2.3.x version, we need to follow these steps: Step 1 Install Ruby with RVM:   ...

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