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Service Mesh and Cloud-Native Microservices with Apache Kafka, Kubernetes and Envoy, Istio, Linkerd

Microservice architectures are not free lunch! Microservices need to be decoupled, flexible, operationally transparent, data aware and elastic. Most material from last years only discusses point-to-point architectures with tightly coupled and non-scalable technologies like REST / HTTP. This blog post takes a look at cutting edge technologies like Apache Kafka, Kubernetes, Envoy, Linkerd and Istio to implement a cloud-native service ...

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Fetching data with ORM is easy! Is it?

java-interview-questions-answers

Introduction Almost any system operates with external data stores in some way. In most of the cases, it is a relational database and very often data fetching is delegated to some ORM implementation. ORM covers a lot of routine and brings along a few new abstractions in return. Martin Fowler wrote an interesting article about ORM and one of the ...

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4 Best Android Libraries for Lazy Image Loading

Images drive user experience. People are said to be highly visual creatures. This is why face-to-face communication is often broken into three elements—7% spoken words, 38% voice and tone, and 55% body language—according to Albert Mehrabian’s 7-38-55 rule of personal communication.  We perceive the world mainly through our eyesight, picking up fewer signals from the rest of the senses. As ...

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Recent Drools DMN open source engine performance improvements

We are always looking to improve the performance of the Drools DMN open source engine. We have recently reviewed a DMN use-case where the actual input population of Input Data nodes varied to some degree; this highlighted a suboptimal behavior of the engine, which we improved in recent releases. I would like to share our findings! Benchmark development As we ...

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Building Java 6-8 Libraries for JPMS in Gradle

Find out how to use Gradle to build Java 6-8 libraries that support JPMS (Java Platform Module System) by providing Java 9 module-info.class. Introduction If you need introduction to JPMS itself, check out this nice overview. This post is primarily targeted at Java library maintainers. Any such maintainer has to make a choice of which JDK to target: Targeting the ...

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PlantUML: Diagrams as Code

Everything “as code” is all the rage now. What can we represent as code except for the programs? First of all, infrastructure as code is gaining popularity — it is enough to see the Google Trends graph for it to see that it is steadily climbing year by year. Terraform, OpenShift, CloudFormation, Helm, Puppet and many other tools are the representatives of ...

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A giant leap forward with multithreaded incremental solving

OptaPlanner finally supports multithreaded incremental solving. The speedup is spectacular. Even with just a few CPU cores, it triples the score calculation speed. See the results below. To activate it, a single extra line in the configuration suffices. The original feature request stems from 2007. Throughout the years, step by step, we diligently prepared the internal architecture for it. So ...

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