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Graph Degree Distributions using R over Hadoop


There are two common types of graph engines. One type is focused on providing real-time, traversal-based algorithms over linked-list graphs represented on a single-server. Such engines are typically called graph databases and some of the vendors include Neo4j, OrientDB, DEX, and InfiniteGraph. The other type of graph engine is focused on batch-processing using vertex-centric message passing within a graph represented ...

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Code For Maintainability So The Next Developer Doesn’t Hate You


Unless your problem domain includes some specific need for highly optimized code, consider what is your biggest coding priority. I’m going to suggest that you make it maintainability. There was an online meme going around recently that suggested that you should code as if the person that will maintain your code is a homicidal maniac that knows your address. Okay, that’s ...

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10 things you can do to make your app secure: #4 Access Control


This is #4 in a series on the OWASP Top 10 Proactive Controls: 10 things that developers can do to make sure that their app is secure. Access Control aka Authorization, deciding who needs what access to which data and to which features, and how these rules will be enforced, needs to be carefully thought through up front in design. ...

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Creating logs in Android applications


For Android applications, logging is handled by the android.util.Log class, which is a basic logging class that stores the logs in a circular buffer for the whole device. All logs for the device can be seen in the LogCat tab in Eclipse, or read using the logcat command. Here is a standard log output for the LogCat tab in Eclipse ...

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RESTBucks Evolved


The book REST in Practice: Hypermedia and Systems Architecture uses an imaginary StarBucks-like company as its running example. I think this is a great example, since most people are familiar with the domain. The design is also simple enough to follow, yet complex enough to be interesting.   Problem Domain RESTbucks is about ordering and paying for coffee (or tea) ...

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Making Unsafe safer


Overview If you use Unsafe directly, you risk crashing the JVM.  This happens when you access a page of memory which hasn’t been mapped and the result on Unix is a SIGSEG (if you access page 0) or SIGBUS (if you access another page which is not mapped). Using MethodHandles Wrapping Unsafe method with a MethodHandle is a possible solution. ...

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The Product Owner’s Guide to the Sprint Retrospective


Summary The sprint retrospective is the key mechanism in Scrum to improve the way people work. Some product owners believe though that they should not attend the meeting, and if they do then only as guests and not as active participants. But the retrospective does not only benefit the development team and the ScrumMaster; it is also an opportunity for ...

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Test Data Builders and Object Mother: another look


Constructing objects in tests is usually a painstaking work and usually it produces a lot of repeatable and hard to read code. There are two common solutions for working with complex test data: Object Mother and Test Data Builder. Both has advantages and disadvantages, but (smartly) combined can bring new quality to your tests. Note: There are already many articles ...

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Docker Containers With Gradle in 4 Steps


 Do you need to create a Docker image from your Java web app? Are you using Gradle? If so, then you are only 4 steps away from Docker nivana. For this example, I’m going to use a simple Spring Boot application. You can find all the source code in my Github repository dubbed galoshe. If you haven’t had a chance ...

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Getting Started with Gradle: Introduction


Gradle is a build tool which replaces XML based build scripts with an internal DSL which is based on Groovy programming language. It has gained a lot of traction recently and that is why I decided to take a closer look at it. This blog post is the first part of my Gradle tutorial, and it has two goals: to ...

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