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SEARCH KEYWORD -- Usef interface

  Implement struct no copy in GoLang

There is some case where some of the struct in GoLang which is not meant to be copied. For example, sometimes a global configuration which should have only one version passed around the whole application and should not be copied and modified. In GoLang, there is no intuitive solution on preventing copying of struct. But there is still some way which can be leveraged to help prevent this while developing the code. The trick is to define some struct implementing sync.Locker interface and has this ...

   GO VET,NOCOPY,NO COPY     2020-09-04 22:24:58

  Simple Animation in the HTML5 Canvas Element

HTML5 is generating all kinds of buzz these days. Some of the buzz is about HTML5 being a replacement for Adobe’s Flash. I don’t think it’s there yet but it’s certainly on the way to changing the way content is presented on the web. This is a description of a very simple animation in an HTML5 canvas element. It is coded for readability and not for optimized operation. We’ll add a canvas element to a web page and then use javascript to draw on it. We will...

   HTML5,Canvas,Animation,Sample code     2011-07-01 10:20:08

  WireGuard VPN Troubleshooting

When you are working as a network/cluster admin for you team to config the WireGuard VPN for other members, you may meet some of the problems below and these are the solution you can try to fix them. ----------------------------------------------------------------------------------------------------------- Problem [1]: The WireGuard handshake request send from the client can be received from the server but the server's response was blocked at some where so the client can not receive serv...

   WIREGUARD,VPN,TROUBLESHOOTING     2021-12-14 09:17:46

  Clojure & Java Interop

About a year ago I got a phone call asking if I wanted to join another team at DRW. The team supports a (primarily) Java application, but the performance requirements would also allow it to be written in a higher level language. I'd been writing Clojure (basically) full-time at that point - so my response was simple: I'd love to join, but I'm going to want to do future development using Clojure. A year later we still have plenty of Java, but the vast majority of the new code I add is Cloj...

   Java,Clojure,Interoprability,Commit,Function call     2011-12-29 09:11:22

  How to Set Spring profile With Example

Technology:  Spring Profiles provides a way to isolates the parts of application configuration, it will make available only in certain environments. It is mainly useful it wants to load spring beans based on environment configuration, for example if the operating system is windows we can load some specific spring beans, if it is other than load different spring beans. One more scenario where spring profiles widely used, like for QA environment we will use some database which is hosted local...

   JAVA,PROFILE,SPRING,DEVELOPMENT,APPLICATIONS     2018-07-20 01:17:23

  Foursquare : 20 million users and 2 billion check-ins

Yesterday was the Foursquare third annual 4sqDay celebration (Four - squared open four square, ie April 16), this mobile phone service site which is based on user location information confirmed that their users reached 20 million and there were two billion check-ins.Foursquare was founded in 2009 and it is a mobile phone service website based on the user location information .It encourages mobile phone users to share their current geographic location and other information with others. In co...

   Fpoursquare,Check-in,4sqDay     2012-04-17 13:39:14

  Configure a PHP web server on CentOS

Are you used to use cPanel or Plesk on VPS for your PHP website management? If for some reason you don't want to use them? What can you do? How do you maintain your website? How do you access Emails, use FTP to upload files or use phpMyAdmin to manage your databases? You may need to configure all these services yourself on a VPS without cPanel or Plesk or other similar apps.But to configure all these services on a Linux server is not an easy job. You may spend many nights but still fail to get s...

   Cron,Linux,CentOS,Email,FTP,MySQL     2012-07-08 06:01:56

  Kubernetes: Docker out

Recently，The hottest news in the Kubernetes circle that docker will be deprecated has been confirmed by the release of 1.20. Docker support in the Kubelet is now deprecated and will be removed in a future release. The Kubelet uses a module called “dockershim” which implements CRI support for Docker and it has seen maintenance issues in the Kubernetes community. We encourage you to evaluate moving to a container runtime that is a full-fledged implementation of CRI (v1alpha1 or v...

   DOCKERSHIM,DOCKER,KUBERNETES     2020-12-19 21:10:21

  C++ Versus Objective-C

What will programming in Objective-C mean to the C++ programmer Different Object Oriented Languages Almost all of us have heard the term object oriented programming, and most of us have used C++. How will Apple's purchase of NeXT, and NeXT's framework using Objective-C affect us as we develop software? If we know C++ already, how hard will it be to get up to speed on Objective-C? Many people will agree that once they understand the concepts of object oriented programming it doesn't matter...

   C++,Objective-C,OOP,Comparison,Methods,Philosohpy     2011-12-12 07:51:40

  There are no free lunches on the internet

Hot data: An IT technician checks the network servers at a data farm. Alamy Photograph: Juice Images/AlamyPhysics has Newton's first law ("Every body persists in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed"). The equivalent forinternet services is simpler, though just as general in its applicability: it says that there is no such thing as a free lunch.The strange thing is that most use...

   Free lunch,Facebook,Google,Privacy information     2011-11-21 03:03:31

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