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Drools Executable Model

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The Executable Model is a re-design of the Drools lowest level model handled by the engine. In the current series (up to 6.x) the executable model has grown organically over the last 8 years, and was never really intended to be targeted by end users. Those wishing to programmatically write rules were advised to do it via code generation and ...

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Template Method Pattern Example Using Java Generics

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If you find that a lot of your routines are exactly the same except for certain sections, you might want to consider the Template Method to eliminate error-prone code duplication. Here’s an example: Below are two classes that do similar things:                 Instantiate and initialize a Reader to read from a CSV file. Read ...

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Camel on JBoss EAP with Custom Modules

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Apache Camel — the best open source integration library Apache Camel is an awesome, open-source, integration library that can be used as the backbone of an ESB, or in stand alone applications to do routing, transformation, or mediation of systems (read: integrating multiple systems). Camel is quite versatile and does not force users to deploy into any particular container or ...

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Grouping, sampling and batching – custom collectors in Java 8

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Continuing first article, this time we will write some more useful custom collectors: for grouping by given criteria, sampling input, batching and sliding over with fixed size window. Grouping (counting occurrences, histogram) Imagine you have a collection of some items and you want to calculate how many times each item (with respect toequals()) appears in this collection. This can be achieved ...

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Use Cases for Elasticsearch: Flexible Query Cache

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In the previous two posts on use cases for Elasticsearch we have seen that Elasticsearch can be used to store even large amounts of documents and that we can access those using the full text features of Lucene via the Query DSL. In this shorter post we will put both of use cases together to see how read heavy applications ...

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Test Attribute #5 – Differentiation

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This the 5th post about Test Attributes that started off with celebrity-level “ How to test your tests” post. Differentiation is not an attribute of a single test. Differentiation does not ride alone, because it requires multiple tests.   Tests allow us to (a) know something is wrong and (b) help us locate that something. We want to plant lots ...

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SonarQube As An Education Platform

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I’ve been using SonarQube [1] platform for more than four years. I remember the time when it was making its first baby steps as a code quality management tool. It looked more like a system that was integrated with various third-party static analysis tools (like PMD, FindBugs etc.) and provided a few but important code quality metrics. Many things changed over the ...

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Why you should build an Immutable Infrastructure

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Some of the major challenges today when building infrastructure are predictability, scalability and automated recovery. A predictable system will promote the exact same artifact that you tested into your production system so no intermittent failure can cause any trouble. A scalable system makes it trivial, especially automatically, to deal with any rise in traffic. And automated recovery will make sure ...

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