Running a command as a service in Window!

To create service:

 sc.exe create YOUR_SERVICE_NAME binpath= <PATH_TO_YOUREXECUTABLE>

 

Example:  sc.exe create dockerDService binPath= "C:\Program Files\Docker\Docker\resources\dockerd.exe" start= auto

To delete service:

  sc.exe delete SERVICE_NAME 

 Example : sc.exe delete dockerDService 

Note: Use PowerShell or the command Terminal with Administrator mode

Backup(Transferring and Synchronizing files) using python multiprocessing and rsync !

rsync(remote sync) is a utility for efficiently transferring and synchronizing files between a computer and an external storage

1. Copy or sync files locally:

2. rsync -zvh [Source-Files-Dir] [Destination]

3. Copy or sync directory locally:

4. rsync -zavh [Source-Files-Dir] [Destination]

5. Copy files and directories recursively locally:

6. rsync -zrvh [Source-Files-Dir] [Destination]  

7. Sample  python code  script to do a backup using python...

8. 
   

9. #!/usr/bin/env python

   import subprocess

   from multiprocessing import Pool

   
   

   from os import walk 

   
   

   src= "/home/user/data/"

   dest="/home/user/data/backup/"

   def backupData(dir):

       print("dir = "+ src+dir +" dest = " + dest+dir)

       subprocess.call(["rsync", "-arq", src+dir, dest+dir]) 

   
   

   dirList = []

   for (root, dirs, files) in walk(src):

       dirList.extend(dirs)

       break;

   print (dirList)

   p= Pool(len(dirList))

   p.map(backupData, dirList)

Cucumber/Gherkins with Java(kotlin) !

Cucumber is an opensource, Behavior-Driven Development (BDD) framework, where you execute your automated tests. You can pick up a regression suites for your automation test. We will mostly discuss about the the automation test written in Java/Kotlin in this tutorials.

Cucumber reads executable specifications written in plain text and validates that the software does what those specifications say.

What is Gherkins:

Gherkins is a business readable domain specific language. It is a set of grammar rules that makes plain text structured enough for Cucumber to understand.

Example :  Users are presented with Invalid Username/Password method when authentication fails

Scenarios: 

Cucumber uses Scenarios to defines the steps . You describe the Scenarios using Given, When, And and Then, But 

Example: 

Scenario: Users are presented with Invalid Username/Password method when authentication fails
  Given User is in the login page
  when User fills the invalid username or password
  And User hit the submit button
  Then User see the pop up screen saying Invalid Username/Password
When we define the  Scenario, we  can define multiple pre condition and multiple action and multiple expected outcomes.

We can collapse these two or more similar scenarios into a Scenario Outline as following
Scenario Outline: eating
  Given there are <start> cucumbers
  When I eat <eat> cucumbers
  Then I should have <left> cucumbers

  Examples:
    | start | eat | left |
    |    12 |   5 |    7 |
    |    20 |   5 |   15 |

(src: cucumber.io)

What is Feature and Feature File:

Feature can be defined as a standalone business functionality of a project. Feature file describes the testing needs for any features. A features file can contains one or many scenarios for you automated testings.In order the automatically detect the features by cucumber framework, you need to define it with .feature file extension. You will normally have a desperate feature file for each feature. 

(This post is still in progress--- keep visit us again)

Updating the hosts file in MAC

echo '172.16.144.128 hdp hdp' | sudo tee -a /private/etc/hosts

Bash script to rename or move files from a directory !

Following is the bash script that renames a sets of file form the current directoy. In the following is just updating the extension.

#/bin/bash

for file in *.JPEG; do

        name=$(basename "$file" .JPEG)

        mv "$file" "$name.jpeg"

done

Git - more on Git Tags -

The following steps outlines the Git Tag delete process both locally and remotely.

1.  Fetch all the tags from
   git fetch --tags
2. Delete the tag locally
   git tag -d yourTagToDelete  (eg: git tag -d v1.15.0)
3. Delete the tag in Remote
   git push origin :yourTagToDelete (eg git push origin :v1.15.0)
4. Create a new  tag locally
   git tag yourNewTag  (eg: git tag v1.15.0)
5. Push tag to Remote
   git push origin yourTagToDelete (eg git push origin v1.15.0)

Restarting Spring Boot Application !

Restarting Spring Boot Application  !

You have several options to restart Spring boot Application . You can restart either of the following three options. Based on your requirement you can choose one of the following.

1. Using spring-boot-devtools
           Add your Gradle dependency

    dependencies{ 
                compileOnly("org.springframework.boot:spring-boot-devtools")
  }

    After that Add, you can simply add an end poing on your controller class and have the following:
          org.springframework.boot.devtools.restart.Restarter.getInstance().restart();   

The drawback of using tools is you cannot make a good used of @Cacheable . it might cause ClassCastException while reading from the cache.


2. Using RestartEndPoint from 
   Add your Gradle dependency

  dependencies{ 
     compile "org.springframework.boot:spring-boot-starter-actuator"
  }

    After that Add, you can simply add an end on your controller class and have the following:

   @Autowired
   RestartEndpoint restartEndpoint;
   
  And call the following methond from your controller :
  restartEndpoint.restart() 
     
You might see NullPointer Exception while trying to bring the application up specially when you have UnderTow as your servlet container 

 3.   And the third one is reading the current context and restarting it. You can simply add the following method on the Main Class and invoke from your controller

       public static void restart() {
          ApplicationArguments args = appContext.getBean(ApplicationArguments.class);
          Thread thread = new Thread(() -> {
          appContext.close();
          SpringApplication springApplication = new SpringApplication(MyBootApplication.class);
          springApplication.addListeners(new ApplicationPidFileWriter());
          appContext =springApplication.run(args.getSourceArgs());
        });
       thread.setDaemon(false);
       thread.start();
      }

Thread Dumping in Unix - flyway recorder !

 jcmd 8308 JFR.start duration=100s filename=tempo.jfr

Monogo Pipeline scripts !

1. Filter by an assistance of an array element in a document:

  $and:[{assessmentPeriods:{$ne:null, $exists:true, $ne: []}}  ]

2.