This project showcases two implementations of an event management system to compare classic Object-Oriented Analysis and Design (OOAD) with the Value-Driven Domain Pattern (VDD). The demos are presented as part of a conference talk, demonstrating modern Java design practices.

• OOAD Demo: Uses mutable classes, inheritance, instance methods.
• VDD Demo: Leverages immutable records, sealed interfaces, pattern matching, and pure functions.

Gang of Four patterns applied:

• Factory
• Strategy
• Observer

Both demos include a command-line interface (CLI) to create events, register attendees, view details, and calculate revenue.

• Java 21: Ensure JDK 21 is installed. Download from Adoptium or Oracle
• Operating System: Unix-like (Linux, macOS) or Windows.
• Shell: Bash for .sh scripts (Unix-like) or Command Prompt for .bat scripts (Windows).
• Maven: To publish core artifacts into local maven repository
• Git: To clone the repository (optional).

Verify Java version:

java --version

# Expected sample output:
openjdk 21.0.6 2025-01-21 LTS
OpenJDK Runtime Environment (build 21.0.6+10-LTS)
OpenJDK 64-Bit Server VM (build 21.0.6+10-LTS, mixed mode, sharing)

Clone or Download:

• Clone the repository:

git clone value-driven-domain-pattern

cd value-driven-domain-pattern

• Or download and extract the project zip.

Directory Navigation:

• VDD demo: demos/event-management-system/

• OOAD demo: ooad-foundations/event-management-system/

1. First ensure required artifacts are published in your local maven repository

• Unix-like Systems(Linux/MacOs):

cd core/
./gradlew publishToMavenLocal --no-daemon

# The artifacts (common, domain, operations) are published to ~/.m2/repository/com/example/core/

• Windows

cd core
gradlew.bat publishToMavenLocal --no-daemon
# The artifacts (common, domain, operations) are published to %USERPROFILE%\.m2\repository\com\example\core\

2. Build a Fatjar of the cli-app

• Unix-like Systems(Linux/MacOs):

cd ..
cd cli-app
./gradlew clean build --no-daemon

• Windows

cd ..
cd cli-app
gradlew.bat clean build --no-daemon

3. Test the standalone cli-app

• Unix-like Systems(Linux/MacOs):

java -jar build/libs/cli-app-1.0.0.jar --help

# Expected sample output
Event Organizer CLI:
Usage: java -jar cli-app.jar [command]
Commands:
  --help          Display this help message
  list-events     List all events (requires pre-loaded data)
Interactive mode is used if no arguments are provided.

• Windows

java -jar build\libs\cli-app-1.0.0.jar --help

# Expected sample output
Event Organizer CLI:
Usage: java -jar cli-app.jar [command]
Commands:
  --help          Display this help message
  list-events     List all events (requires pre-loaded data)
Interactive mode is used if no arguments are provided.

• Unix-like Systems: Build:

cd ooad-foundations/event-management-system
./src/scripts/build.sh

# Creates out/ with compiled classes.

Run CLI:

./src/scripts/run-cli.sh

# Launches the CLI with options to create events, register attendees, etc.

• Windows: Build:

cd ooad-foundations\event-management-system
src\windows-scripts\build.bat

Run CLI:

src\windows-scripts\run-ooad-cli.bat

Both CLIs offer:

• Create events (Concert, Conference, Exhibition, Workshop)

• Register attendees with capacity checks

• View event details, attendees, and revenue

• List events or exit

• Java 21+
• Maven (Required)
• Gradle (Optional)

Ensure JAVA_HOME is set to JDK 21.

Check script permissions (chmod +x *.sh on Unix-like systems).

For Windows, run .bat scripts in Command Prompt.

For issues or questions, reach out to the presenter or open an issue in the repository at https://gitlab.com/parsaizme/value-driven-domain-pattern. Happy coding, and enjoy the demos!