SEARCH KEYWORD -- Web Worker


  Use Java ThreadLocal with caution

According to Oracle documentation, ThreadLocal is a class provides thread-local variables. These variables differ from their normal counterparts in that each thread that accesses one (via its get or set method) has its own, independently initialized copy of the variable. ThreadLocal instances are typically private static fields in classes that wish to associate state with a thread. In short, ThreadLocal variables are variables belong to a thread, not a class or an instance of a class. One common...

   JAVA,MEMORY LEAK, THREADLOCAL     2015-11-03 07:31:57

  Web evolution history

I guess many of us want to know about web evolution history since it changes so fast. Web has changed our life style, there are many big events in web history. Following picture give us a general understanding of the history of web.Original author : 陈皓 Reference : http://coolshell.cn/articles/1178.html...

   Web,History,Figure     2012-04-25 07:40:52

  Resolve high CPU usage issue caused by file_get_contents in PHP

Sometimes a Linux server which runs Nginx + PHP-CGI(php-fpm) web service may experience sudden system load increase and the CPU usage is around 100% for many php-cgi processes when checking with top command. If this happens, file_get_contents may be the cause if it's used in the PHP script. In lots of web applications, normally there are lots of API requests based on HTTP. Many PHP developers like to use file_get_contents("http://example.com/") to get the API response because it's simple to...

   PHP,FILE_GET_CONTENTS,PHP-CGI     2018-11-09 21:35:00

   How to Calculate Distance in Asp.Net MVC with Google Maps

Internet users are vastly dependent on both Google and Bing mapping tools. The API available for developers provides them an ability to add value to the solutions developed by them.There is no such requirement of using everything. There are times when only a snippet can make a big difference to the app users. In this article, asp.net development experts will explain how to use Google Maps APIs and help office staff to calculate distance. When a team is travelling for the job, they either ride on...

   ASP.NET MVC     2017-03-10 06:29:23

  What is cache penetration, cache breakdown and cache avalanche?

When designing and developing highly available system, cache is an very important consideration. It is useful to cache some frequently accessed data so that they can be accessed quickly and also cache can protect the downstream system like DB from being hit too often.  To provide better cache design in large systems, some problems may need to be considered first. In this post, we will talk about some frequently discussed cache problems and mitigation plans. Cache penetration Cache penetrati...

   SYSTEM DESIGN,CACHE PENETRATION,CACHE BREAKDOWN,CACHE AVALANCHE     2020-04-10 08:43:00

  What does a contemporary web developer need to know?

The early ages of web era mainly consisted of webpages of text and links. At that time,Netscape was the still dominant of web browser market. As a web developer, you could develop web apps(or better to call web pages) easily with knowledge of HTML only. But with the evolution of web, new technologies came out, we can see more robust web apps around us everywhere. Today as a web developer, the ability to run and configure a web server and edit HTML to create some simple web pages has lost almost ...

   Web design,Advice     2013-12-20 06:31:51

  Access control in Java -- doPrivileged

Previously we have introduced how Java performs permission check to protect resource access. What if sometimes we need to give some class the temporary access to some resource which it initially doesn't have? AccessController provides six doPrivileged methods to fulfill this requirement. These six methods have below signatures : static T doPrivileged(PrivilegedAction action)static T doPrivileged(PrivilegedAction action, AccessControlContext context)static T doPrivileged(PrivilegedExceptionA...

   JAVA,SECURITY,DOPRIVILEGED     2016-03-08 05:46:42

  Nielsen : Google ranks No.1 web brand

Nielsen released the 2012 digital industry rankings report, The report said Google continued to rank No.1. for web brand From January 2012 to October 2012, the average monthly unique visitors reached 172 million. Followed by Facebook which has 153 million average monthly unique visitors. In 2012, the online video service continues to grow, YouTube is still the largest online video site, an average annual 132 million unique visitors. Top 10 U.S. Web Brands of 2012 For the details of other ranks ...

   Nielsen, Web brand,2012     2012-12-22 10:02:05

  When and How to Use the Go Channel

Go’s concise structure and powerful native library enable us to hit the ground running easily. It is more efficient than Java or Python when implementing the same functions, especially its concurrent programming, which is very handy and widely admired due to its goroutine and channel. goroutine and channel has much to dig into, and let’s start with channel, which I used to consider narrowly as a message queue to transfer data between gorouti...

   GOLANG,CONTEXT,CHANNEL     2022-09-17 23:06:36

  What is Deep Web- all you need to know about it?

Deep web is the most nefarious out of sight underground area that exists and not accessible to the public domain. The deep web sites cannot be accessed through standard search engines. Many experts believe to have compared this part of the internet hidden from paywalls and forms. The truth is that deep web is a hidden iceberg while the usual internet available to the public domain is just the tip of the iceberg. That part of what is available from search engines such as Bing or Google ...

   DEEP WEB,DARK WEB     2018-07-05 08:26:58

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