Saturday, May 16, 2020

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




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Monday, April 20, 2020

Git - Delete 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)
     

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Saturday, April 18, 2020

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
  2.            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.

  3. Using RestartEndPoint from 
  4.    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();
      }

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Saturday, March 21, 2020

Thread Dumping in Unix - flyway recorder !

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

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Thursday, March 5, 2020

Monogo Pipeline scripts !

1. Filter by an assistance of an array element in a document:
  $and:[{assessmentPeriods:{$ne:null, $exists:true, $ne: []}}  ]

2. 


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