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  Kubernetes Authentication & Authorization 101

If we want to build a system with user modules, Authentication and Authorization are something that we can never ignore, though they could be fuzzy to understand. Authentication (from Greek: αὐθεντικÏŒς authentikos, “real, genuine”, from αὐθέντης authentes, “author”) is the act of proving an assertion, such as the identity of a computer s...

   RBAC,AUTHORIZATION,AUTHENTICATION,KUBERNETES     2021-06-05 23:19:18

  Why accessing Java HashMap may cause infinite loop in concurrent environment

HashMap in Java is frequently used to handle key/value pairs. But it is not a good candidate to be used in concurrent environment where ConcurrentHashMap should be used instead. If used in concurrent environment, it may cause lots of unexpected behavior even including make the program getting into an infinite loop situation. To understand how this can happen, let's first discuss how HaspMap works internally. In this post we will use implementation of HashMap before Java 8 as example, Java 8 prov...

   JAVA,HASHMAP,INFINITE LOOP     2020-03-29 01:47:00

  Amazon is tesing in-app purchase service to chanllenge Apple and Google

According to Bloomberg News, Amazon is testing a service that allows Tablet PC users to purchase goods through mobile applications, this shows that Amazon may enter the market led by Google and Apple.According to Maria Ly, co-founder of the fitness club members card vendor Skimble which involves in the test project in the Amazon. Amazon is testing the in-app purchase service which allows users to subscribe to and purchase of goods in the application. Amazon spokesman Kinley Pearsall declin...

   Amazon,in-app purchase service,Apple,Google     2012-04-04 08:18:18

  Translating math into code with examples in Java, Racket, Haskell and Python

Discrete mathematical structures form the foundation of computer science.These structures are so universal that most research papers in the theory of computation, programming languages and formal methods present concepts in terms of discrete mathematics rather than code.The underlying assumption is that the reader will know how to translate these structures into a faithful implementation as a working program.A lack of material explaining this translation frustrates outsiders.What deepens that fr...

   Math,Algorithms,Formula,Program,Python     2011-11-14 08:43:15

  PHP: a fractal of bad design

Preface I’m cranky. I complain about a lot of things. There’s a lot in the world of technology I don’t like, and that’s really to be expected—programming is a hilariously young discipline, and none of us have the slightest clue what we’re doing. Combine with Sturgeon’s Law, and I have a lifetime’s worth of stuff to gripe about. This is not the same. PHP is not merely awkward to use, or ill-suited for what I want, or suboptimal, or...

   PHP,Design,Analysis     2012-04-11 13:46:57

  Do You Make These 5 Database Design Mistakes?

Look, everyone makes mistakes. It’s true. But not all of us have the chance to make mistakes that end up costing millions of dollars in hardware and production support costs. Any one of the following five mistakes listed below will add additional costs to your company. It’s guaranteed. The costs could be hardware related (extra disk space, network bandwidth), which tend to add up quickly. The costs are also support related (bad performance, database re-design, report cre...

   Database design,Mistake,Advice,Data type,Compatibility     2012-01-03 11:25:13

  How VR technologies take over the world

Virtual Reality (VR) literally may get it beneficial to experience anything, anywhere, anytime. It is normally the several immersive type of legitimate fact technology and can convince the real real human human brain that it is usually normally someplace it can get absolutely critically not really seriously. Brain installed displays happen to be used with earphones and hands controllers to offer a entirely immersive arrive across. With the major technology businesses on whole world community (Fa...

       2019-05-20 05:30:39

  Making Sites Shine with @font-face

Like many of my web designer brethren, I’m a bit of a typographic geek. And like many web designers, I’ve been frustrated (to say the least) about the historical state of web typography.At first, we were limited to a common, but very small set of “web safe” fonts. Anything beyond those fonts, we had to rely on images. Images for text not only meant we had to create and maintain dozens (if not hundreds) of images, but it introduced accessibility issue...

   HTML,Font face,Font family,Demo,Example     2011-08-19 08:16:29

  Redesigning the Technical Hiring Process

Since my last post on technical interviews, I’ve been fairly involved in hiring at Pulse as we grew our team from 6 people when I joined last November to 14 full-timers. In my previous post, I suggested that technical interviews, in the conventional sense, are not especially effective (by technical interviews, I mean the traditional 45 minute coding-at-a-whiteboard and algorithm puzzlers interviews). Those do a great job of telling you how well a candidate is at acing those types o...

   Career,Recruitment,Process,Developer,Ski     2011-09-14 12:01:37

  Is Java Set ordered or not?

“Is Java Set ordered or not? ” is the most popular question asked when you interview for a Java Developer position. Many fail to answer it, and I have to admit I was one of the many. I have known the answer is “Yes and No” for a long time. No. HashSet is not ordered. Yes.TreeSet is ordered. If the interviewer continues with some follow up questions, I’m not confident that I know the answer then. Why is TreeSet ordered? Are there any other ordered S...

   ORDER,SORTEDSET,HASHSET,JAVA     2021-02-11 06:55:00

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