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The Decorator Pattern


The Decorator Pattern One design pattern that I don’t see being used very often is Decorator. I’m not sure why this pattern isn’t more popular, as it’s quite handy. The Decorator pattern allows one to add functionality to an object in a controlled manner. This works at runtime, even with statically typed languages! The decorator pattern is an alternative to subclassing. ...

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Check your REST parameters!


I was doing research related to my ongoing “project student” series and realized that I had made one of the most common – and most easily remedied – mistakes. I wasn’t using everything I know about the webapp to push my security perimeter outwards. I am thinking specifically about the UUID parameters. I know that every valid externally visible ID ...

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Upgrading to Java 7 on Google’s AppEngine


If you are still running a Java 6 application on Google AppEngine, you’re about to get into serious trouble. Any moment now, the AppEngine team is going to release version 1.8.9, which will no longer support deployment of Java 6 applications. Existing applications will keep on running. But you should probably upgrade your application with the necessary urgency, as you will ...

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Making HTTP content compression work in netty 4


Netty is really a great framework providing all the things needed to build a high performance HTTP server. The nice thing is, that nearly everything comes out of the box and has just to be put together in the right way. And content compression (gzip or deflate) is no exception. However, when it comes to compressing static content I stumbled ...

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Hibernate: DDL Schema generation


Not so long time ago I have to work with in-memory database. This activity was related to integration testing. As you know, it is a normal practice to use in-memory data bases for the integration testing. There are several reasons for this: portability, well grained environment infrastructure, high performance, consistency of original data base. The problem is a coppying of ...

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My Priorities for Scala


What TypeSafe Should be Working On There was a Twitter thread that started off discussing Clojure REPL usage but devolved into a discussion of Scala’s compiler. An Aside Well, not an aside… My Clojure workflow is: use Clojure’s REPL to incrementally create code and once the code is right, write a test around the code and move on to the ...

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The SQL Language’s Most Missing Feature


SQL is also awesome in many ways. We can write out the most complex truths and facts and have the database tell us the answer in no time. But the SQL language is arguably the most beautiful programming language out there. It has so many caveats that people like me get ridiculously rich selling consulting services just to merely explain its semantics. One ...

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Master/Slave Failover for Camel Routes


One way to implement a master/slave failover pattern is to have a cluster of instances of an application where one instance (the master) is currently active and the other instances (the slaves) are on standby, ready to take over whenever the master fails. Some projects provide this kind of master/slave support out of the box: Creating a failover deployment for ...

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9 technologies to be discussed in 2014


According to 9 technologies for a supercharged 2014 there are a few important technologies that are about to increase programmers’ interest in 2014. Below, they are presented in short: 1. Document databases Structured storages and document databases have started to step aside, since NoSQL databases and big data solutions like MongoDB and Couchbase have showed up. 2. Key-value stores Couchbase, ...

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Android Tutorial : Two methods of passing object by Intent (Serializable,Parcelable)


In this post, I will show you an simple example of how to pass object by intent in Android application. Parcelable and Serialization are used for marshaling and unmarshaling Java objects. In Parcelable, developers write custom code for marshaling and unmarshaling so it creates less garbage objects in comparison to Serialization. The performance of Parcelable over Serialization dramatically improves (around ...

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