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  The war with spam comment

Spam comments are annoying and notorious. They are either malicious data from hackers to exploit the loopholes of the site or advertisements posted by robots. These kinds of comments have their own features and patterns, if we are careful enough, we can find ways to block most of them although it's not so easy. To block the comment with malicious executable codes such as JavaScript, we should remember one rule : never trust user input. So wherever there are user inputs, we need to check the vali...

   Spam comment,Block,Filter     2013-11-29 20:29:43

  MaxHeapSize in JVM

MaxHeapSize is an option which is to set the JVM maximum heap size can be allocated. We can specify the MaxHeapSize as VM argument when we run the program by setting -XX:MaxHeapSize=, here can be 2M, 20M, 200M etc. We can also view the current MaxHeapSize set by setting different JVM options. To view the MaxHeapSize, we can use two JVM options : -XX:+PrintFlagsFinal and -XX:+PrintCommandLineFlags. Below is one example when running -XX:+PrintFlagsFinal: bool MaxFDLimit ...

   JVM,MaxHeapSize,Alignment     2014-06-17 07:01:50

  How to choose JavaScript template engine?

With the increase of density of web front end development, AJAX and JSON are used more and more frequently, it's necessary to use many tags in front end development. You may have a JSON object as below: var data={  email: 'terry.li@gbin1.com,  gender: 'male'  } Then you need to organize the JSON data into page elements. var email, gender;email= ' ' + data.email+ '; gender= ' ' + data.gender + '; $('#contentwrapper‘).append(content).append(gender); The output is very simple: ...

   JavaScript template engine,Template     2012-10-07 07:03:58

  Alphabet chooses the domain extension .xyz

Google has been restructured and it now has a parent company which is called Alphabet. This new company will fully own the original "Google". Larry Page will be the CEO of Alphabet and Sergey Brin will be the president of the new company. Sundar Pichai will be the new CEO of the new Google. The new Google will continue its current business with some slimmed changes. While Alphabet will focus on working on the next generation of Internet and creating more billion user companies and services...

   Google, Alphabet,XYZ, Domain name     2015-08-10 20:18:33

  This Is Why Your Website Is Slow

Click for a larger image Ghostery, the browser plugin that allows its users to "track the trackers," just released data on the tags, widgets and analytics on websites that are the worst in terms of slowing page loads to a crawl. Update: Ghostery discovered an error in their original data set. It appears that Millenial Media was not on this year's list at all, and the #2 slot belonged to AdFunky. Both the text and the graph above have been changed to reflect this. Any webmaster worth his or he...

   Web application,Performance,Slow,Reason,Lagtag     2011-11-30 11:45:25

  How Kafka achieves high throughput low latency

Kafka is a message streaming system with high throughput and low latency. It is widely adopted in lots of big companies. A well configured Kafka cluster can achieve super high throughput with millions of concurrent writes. How Kafka can achieve this? This post will try to explain some technologies used by Kafka. Page cache + Disk sequential write Every time when Kafka receives a record, it will write it to disk file eventually. But if it writes to disk every time it receives a record, it would ...

   BIG DATA,KAFKA     2019-03-08 09:42:57

  How I Quickly Test and Validate Startup Ideas

Since I’ve technically been unemployed now for a week, I’ve spent most of that time brainstorming some new ideas and putting them into a Google Spreadsheet.This week I began going through that list and pulling out the ones I think have a chance and I narrowed a pretty large list down to just a few.Let’s take one of the examples from my list. It doesn’t have a name, so let’s just call it Patient Connect.The idea behind Patient Connect is that it integrates with ...

   Startup,Idea,Choose,Validation,Verify,Invest     2011-10-28 10:14:41

  5 good anti SOPA designs

The Stop Online Piracy Act (SOPA) is a United States bill to expand the ability of U.S. law enforcement to combat online copyright infringement and online trafficking in counterfeit goods. Its goal is to protect the intellectual-property market and corresponding industry, jobs and revenue. However since its proposal, many organizations protest against it as they believed it would threaten free speech and innovation, and enable law enforcement to block access to entire internet domains due t...

   SOPA,PIPA,design     2013-12-24 03:26:31

  C programming tips in SPARC architecture

If you are a newbie of C programmers in SPARC architecture (For example, working on Solaris), you should pay attention to the following tips:(1) By default, SPARC is big-endian (For Endianness, you can refer http://en.wikipedia.org/wiki/Endianness). It means for an integer (short, int, long, etc), the MSB will be stored in the lower address, while the LSB will be stored in the higher address. (2) SPARC requires byte-alignment. It means for a short (2 bytes long) variable, the star...

   C     2014-06-01 03:56:30

  How to enable developer mode on Huawei

As a developer, there might be some need to fake locations when developing and testing mobile apps for different countries. Lots of the times some fake GPS apps will be used and they will ask to enable mock location access on the device before allowing you to fake GPS. To achieve this, we first need to have developer mode enabled. In this post, we will show how the developer mode can be enabled and disabled on Huawei devices. Go to Settings, find About phone and open it. You should be able to se...

   ANDROID,HUAWEI,DEVELOPER MODE,DEVELOPER OPTIONS     2020-08-15 21:22:29

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