hey there ...

Micronaut is a JVM-based full-stack framework used to build modular microservices making

• Use of Java Reflections as the last meachanism to build the dependency tree
• Compile-time dependency injection for inline bytecode generation
• Less CPU & memory resource utilizations

The codebase is built on Micronaut to collate interested stock RSS feeds and render a webpage view from server side, itself. The RSS feeds Google alert urls are in the .env file delimited by '|'. The file has been omitted in the repository, though.

Features implemented

• Operating-system specific configuration files to adhere to 12-factor app principles
• RSS feeds Google alerts in .env file under boot >> src >> main >> resources
• Thread executor pattern & CountDownLatch to synchronize among parallel threads
• Ensure unique row in H2 database in MySQL mode
• Named Query in repository layer
• Server-side web page rendering Micronaut Thymeleaf
• Run in Raspberry Pi B plus on 1 CPU core | 512 Mb RAM

Commands

• Run unit tests & build project : mvn clean package -T 8
• Start H2 Database (Windows) : java -Xms16m -Xmx16m -Xss512k -XX:+UseG1GC -cp h2-2.1.214.jar org.h2.tools.Server
• Start H2 Database (Linux) : nohup java -Xms16m -Xmx16m -Xss512k -XX:+UseG1GC -cp h2-2.1.214.jar org.h2.tools.Server
• Run stock feed executable jar ( Windows) : nohup java -Xms64m -Xmx64m -Xss512k -Dmicronaut.environments=windows -XX:+UseConcMarkSweepGC -jar stock-feeds.jar
• Run stock feed executable jar ( Linux) : nohup java -Xms64m -Xmx64m -Xss512k -Dmicronaut.environments=linux -XX:+UseConcMarkSweepGC -jar stock-feeds.jar
• Shell script (Linux) : nohup ./stock-feed-start-up.sh
• Raspberry Pi startup script :
  • Edit crontab : crontab -e
  • Add line : @reboot /home/pi/stock-feeds/stock-feed-start-up.sh >/dev/null 2>&1
  • Reboot : sudo reboot

Cheers ...

stock-feeds