File-Monitoring Application:

• This is a POC application to monitor events(Create, Update, Delete, etc.) to a file/directory and then for each triggered event execute a series of actions/tasks using the chain of responsibility pattern.

• The directories to monitor and the task to be executed must be dynamically configurable by passing the configs file path either through VM args or application properties.

  • Example:
    • monitoring-config.yaml to configure the file monitoring events and the corresponding command chains to be executed.
    • chain-config.yml to configure the details of commands (command name, execution sequence, etc.) for each of the chains.

The solution is created using:

• Spring Boot CommandLineRunner as this is a console application.
• Maven Multi-Modules to split the code properly to ensure high cohesion.
• Abstract Factory and Dependency Injection patterns to ensure low coupling.
• The chain-of-responsibility design pattern.
• Apache commons-io to capture the file monitoring events.
• Log4j2 to efficiently manage the rolling of log files.
• Creating multiple database connection that can be used with spring boot and hikaricp.
  • Jaspyt for encrypting database passwords.

    # Command To Start The Temporary DB In a Docker Container:
    #---------------------------------------------------------
    # docker pull mysql
    docker run --name mysql-locl -e MYSQL_ROOT_PASSWORD=default -v $HOME/mysql/data:/var/lib/mysql -p 33060:3306 -d mysql
    
    #docker pull ibmcom/db2
    docker run -itd --name db2-locl --privileged=true -p 50000:50000 -e LICENSE=accept -e DB2INST1_PASSWORD=default -e DBNAME=testdb -v $HOME/db2/data:/database ibmcom/db2

Deployment Instructions:

• Run the application using the command:

  java -jar file-monitoring-0.0.1-SNAPSHOT.jar
  

• You can also provide the following optional VM-Args to the above command:

  -Dmonitoring-events.config.yml.path=/c/Users/lenovo/Desktop/monitoring-config.yaml
  

  -Dchain.config.yml.path=/c/Users/lenovo/Desktop/chain-config.yaml
  

  -Dfile.monitoring.app.logs.path=/c/Users/lenovo/Desktop/logs
  

  -Dfile.monitoring.app.logs.level=info
  

• The command to run the application with all the optional VM args:

  java -jar -Dchain.config.yml.path=/c/Users/lenovo/Desktop/chain-config.yaml -Dmonitoring-events.config.yml.path=/c/Users/lenovo/Desktop/monitoring-config.yaml -Dfile.monitoring.app.logs.path=/c/Users/lenovo/Desktop/logs -Dfile.monitoring.app.logs.level=info file-monitoring-0.0.1-SNAPSHOT.jar