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Factory Without IF-ELSE

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Object Oriented Language has very powerful feature of Polymorphism, it is used to remove if/else or switch case in code. Code without condition is easy to read. There are some places where you have to put them and one of such example is Factory/ServiceProvider class. I am sure you have seen factory class with IF-ELSEIF which keeps on getting big. ...

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Ceylon 1.1.0 is now available

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Ten whole months in the making, this is the biggest release of Ceylon so far! Ceylon 1.1.0 incorporates oodles of enhancements and bugfixes, with well over 1400 issues closed. Ceylon is a modern, modular, statically typed programming language for the Java and JavaScript virtual machines. The language features a flexible and very readable syntax, a unique and uncommonly elegant static ...

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WildFly subsystem for RHQ Metrics

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For RHQ-Metrics I have started writing a subsystem for WildFly 8 that is able to collect metrics inside WildFly and then send them at regular intervals (currently every minute) to a RHQ-Metrics server. The next graph is a visualization with Grafana of the outcome when this sender was running for 1.5 days in a row:           ...

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Beginner’s Guide to Hazelcast Part 2

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This article continues the series that I have started featuring Hazelcast, a distributed, in-memory database.  If one has not read the first post, please click here. Distributed Collections Hazelcast has a number of distributed collections that can be used to store data.  Here is a list of them:         IList ISet IQueue IList IList is a collection ...

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Getting Started with Docker

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If the numbers of articles, meetups, talk submissions at different conferences, tweets, and other indicators are taken into consideration, then seems like Docker is going to solve world hunger. It would be nice if it would, but apparently not. But it does solve one problem really well! Lets hear it from @solomonstre – creator of Docker project!         ...

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The reuse dilemma

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The first commandment that any young programmer learns is “Thou Shall Not Duplicate”. Thus instructed, whenever we see something that looks like it may be repeated code, we refactor. We create libraries and frameworks. But removing duplication doesn’t come for free. If I refactor some code so that instead of duplicating some logic in Class A and Class B, these ...

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Keyboard shortcuts in IntelliJ

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I attended a talk by Hadi Hariri at JavaOne last week. He introduced a whole bunch of IntelliJ keyboard shortcuts I was not aware of. Very useful talk. I have listed some of the most useful ones below. Cmd-1: Move focus to the Project window While there, type any class name (including using Camel Case e.g. HW to find HelloWorld), ...

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The Estimates Land mine – use and misuse of estimates

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After posting my last post – Estimate or #NoEstimate that is the question? – I felt a little as if I’d stepped on a land-mine. That is to say I had a few comments and a bit a mini-twitter storm. If I’m being honest I have been avoiding some of the estimates/#NoEstimates debate until now precisely because it is obvious ...

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JavaOne 2014 Observations by Proxy

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I wasn’t able to attend JavaOne this year, but have been happy to see some online resources covering what happened at JavaOne 2014. In this post, I summarize some of the observations made at JavaOne 2014 and provide links to references providing these observations or providing more background details on those observations. The listed observations are in no particular order ...

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