Home » Author Archives: Tomasz Dziurko

Author Archives: Tomasz Dziurko

ZooKeeper, Curator and How Microservices Load Balancing Works

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How Zookeeper makes sure that every worker happily gets some stuff to do from job delegating manager. Apache ZooKeeper is a tool to register, manage and discover services working on different machines. It is an indispensable member in technology stack when we have to deal with distributed system with many nodes which need to know where their dependencies are launched. ...

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Handle Every Event in Your Akka Application

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Event here, event there, events flying everywhere. Post about checking that every Akka event will finally find its home. Akka and reactive, event-based applications are new approach to creating software. We are using Akka pretty intensively in our current Scala-based project. Events fit our use cases especially well as we are communicating with external API which might be slow. This ...

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Apache Wicket: Remember Me functionality

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It is quite common in web applications to have “Remember Me” functionality that allows user to be automatically logged in each time when he visits our website. Such feature can be implemented using Spring Security, but in my opinion using request based authentication framework with component based web framework is not the best idea. These two worlds just do not ...

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Pragmatic Thinking and Learning – how to think consciously about thinking and learning

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Firstly, I think every programmer should read this book, even more, anyone whose career requires constant learning new things, skills of effective thinking and problem solving, should read this book as well. Why? Because in this publication author really carefully gathered the available scientific knowledge about how our brain works, how it processes information and how it stores the new ...

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Parametrizing custom validator in JSF 2

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Writing a custom validator in JSF 2 is not a complicated task. You implement Validator interface, add @FacesValidator annotation and insert validator declaration in faces-config.xml, that’s all. A piece of cake. But let’s consider following scenario: You need custom date validator, let’s say checking that date from rich:calendar is not in the past. So we place calendar component with validator ...

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