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  Behavior of defer function in named return function

In Go, there is a special concept of named return value in function where a returned value can have name. For example, below is a named function in Go. func returnNamed() (i int) { i = 1 return } When the function returns, the return value i will have a value of 1.  Also, Go has a concept of defer which will execute a function just before the calling function exits. This is similar to what finally block does in other languages such as Java. For example, a defer function can be func deferF...

   GOLANG,DEFER,NAMED RETURN,DIFFERENCE     2018-11-20 09:04:07

  Deep Dive into Spin Locks in Golang

In concurrent programming, a Mutex is a commonly used synchronization mechanism to protect critical resources and prevent data races. However, in certain specific scenarios, especially when the lock-holding time is short and the number of threads is limited, a more lightweight lock known as a Spin Lock can provide higher performance. What is a Spin Lock A Spin Lock is a form of busy-wait lock. When a thread attempts to acquire a lock held by another thread, it continuously checks the lock's stat...

   SPINLOCK,MUTEX,GOLANG     2024-01-10 05:53:28

  Readability in Programming Languages

I saw a side by side comparison of a bunch of scripting languages online recently. Scripting Languages: PHP, Perl, Python, Ruby My first, and second reaction was yuck! Now I have my biases – biases which may  not be shared by others of course. But I like readable code and for me anytime I see a special character (anything not an alphanumeric) it slows me down. This got me thinking about where we are going in design of programming languages? Are we moving forward (what ever ...

   Programming,Style,Coding style,Readabili     2011-09-22 09:20:03

  CASSANDRA data model

Cassandra is an open source distributed database, it combines dynamic key/value and column oriented feature of Bigtable. Features of Cassandra are: Flexible schema, no need to design schema first, it's very convenient to add or delete strings Support range search on keys High usability, extensible. The single node error will not affect the cluster. We can think Cassandra's data model as a 4 or 5 dimensional Hash. COLUMN Columns is the smallest data unit in Cassandra, it is a 3 dimensional data...

   Cassandra,database,sort     2013-06-08 22:07:40

  Mock Solutions for GoLang Unit Test

In Go development, Unit Test is inevitable. And it is essential to use Mock when writing Unit Tests. Mock can help test isolate the business logic it depends on, enabling it to compile, link, and run independently. Mock needs Stub. Stub function replaces the real business logic function, returns the required result, and assists the test. I involved the related test code for Controllers while writing Kubernetes Operator recently, and there would be mocks for GRPC and HT...

   UNIT TEST,TESTIFY,GOSTUB,GOMOCK     2020-10-31 21:59:15

  Let's talk about JSON.stringify()

JSON has been used in lots of places to exchange data among different services/systems. Nowadays all mainstream programming languages have built-in library support of JSON data parse and stringify. In this post, let's talk about JSON.stringify() in JavaScript. Let's first take a small example of Object conversion handling. There is a requirement to convert below object const todayILearn = { _id: 1, content: '今天学习 JSON.stringify()，我很开心！', ...

   JAVASCIPT,JSON,JSON.STRINGIFY     2020-02-22 04:25:08

  Why using + to concatenate string in Java loop is not a good option

String concatenation is a common operation in Java programming. It is to concatenate multiple strings into a single string. Java provides a String class which is an immutable class which means the object cannot be mutated once instantiated. Once a String object is instantiated, its properties cannot be changed anymore, so when concatenating strings, it's actually create a new String instance to store the concatenated string values. For example, below is a simple string concatenation example. Str...

   JAVA,STRING,JAVA 8     2019-01-18 22:07:12

  PaaS vs. SaaS: The Differences And How To Pick The Right Option

Platform as a service (PaaS) and software as a service (SaaS) are two kinds of cloud computing products that enable businesses and their clients to deliver and use various services, respectively. Before diving into the differences between the two concepts, it’s important to take a step back and understand what a cloud service really is. Cloud computing primarily refers to large storage of data, programs, and operations that are accessible via the Internet and are not stored on a user&rsquo...

   CLOUD,PAAS,SAAS     2020-04-06 06:30:32

  A Quick Look at the Services Offered by RDBMs vs. NoSQL

The world of IT has to deal with the issue of data storage. The reason for this is that there is plenty of data produced and created daily on the internet and on various business applications. In the past, RDBMs or Relational Database Management Systems were used for storage. Even though they are still used today, there are other offerings that present competition and anyone wishing to purchase data storage systems needs to make comparisons.  One such competing system is NoSQL or Not Only ...

   NOSQL,DATABASE,RDMS,DATABASE SUPPORT     2015-11-06 04:52:54

  Using public key authentication in SSH

SSH is a popular cryptographic network protocol for secure network service operation. It is frequently used in remote server login. For a system administrator or software developer, SSH is frequently used to access remote servers or development servers or testing servers etc.  To login with SSH, there are different authentication mechanisms : password, public key and interactive etc. If a remote server needs to be accessed frequently, password authentication may be too troublesome as p...

   LINUX,DEBUG,SSH,PUBLIC KEY     2016-09-10 05:55:46

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