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Strategy Design Pattern in Java – Example Tutorial

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Strategy pattern is one of the behavioral design pattern. Strategy pattern is used when we have multiple algorithm for a specific task and client decides the actual implementation to be used at runtime. Strategy pattern is also known as Policy Pattern. We defines multiple algorithms and let client application pass the algorithm to be used as a parameter. One of ...

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10 Reasons not to Choose a Particular Open Source software

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We’re all Software Engineers of one type or another. Most of us have one thing in common, though: We’re lazy. And we know that someone else was less lazy and has already solved that tedious problem that we’re on. So we search for Open Source software. But the problem with Open Source software is: There are millions of options for ...

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Scalable real time state update with Storm

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In this post, I illustrate how to maintain in DB the current state of a real time event-driven process in a scalable and lock free manner thanks to the Storm framework. Storm is an event based data processing engine. Its model relies on basic primitives like event transformation, filtering, aggregation… that we assemble into topologies. The execution of a topology ...

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EJB passivation and activation example

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In this tutorial we are going to see how activation and passivation works in a Stateful Java Enterprise Session Bean. 1. Introduction Stateful Session Beans usually hold information about a specific client, and holds that information throughout the whole session. It is a fact though, that client sessions tend to be active for a respectable amount of time, and of ...

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Template Method Design Pattern in Java

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Template Method is a behavioral design pattern and it’s used to create a method stub and deferring some of the steps of implementation to the subclasses. Template method defines the steps to execute an algorithm and it can provide default implementation that might be common for all or some of the subclasses. Let’s understand this pattern with an example, suppose ...

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Visitor Design Pattern in Java – Example Tutorial

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Visitor Pattern is one of the behavioral design pattern. Visitor pattern is used when we have to perform an operation on a group of similar kind of Objects. With the help of visitor pattern, we can move the operational logic from the objects to another class. For example, think of a Shopping cart where we can add different type of ...

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Java EE Stateful Session Bean (EJB) example

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In this article we are going to see how you can use Stateful Session Beans to keep track of state across a client Session in a simple Web Application. 1. Introduction Stateful Session Beans usually hold information about a specific client’s session, and holds that information throughout the whole session (opposed to Stateless Session Beans). A Stateful EJB instance is ...

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Agile Mindset for Your Startup

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I got to share the stage with the other half last week at Harvard Innovation Lab, when Jeffrey Beir & I took turns presenting dueling views on building your startup. Myself from the product perspective, Jeffrey from the investor’s viewpoint. While we had clearly different opinions, one thing we both agreed on was that if you’re going to do a ...

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