Distributed Database Prototype (Java)

This project is a prototype of a simple distributed key-value database implemented in Java. It demonstrates client-server communication using TCP sockets and simulates distributed data management across multiple database nodes.

Key Features

• Client-server communication over TCP (via Socket, BufferedReader, PrintWriter)
• Key-value data storage with CRUD operations (set-value, get-value, find-key, get-max, get-min, etc.)
• Node communication and coordination (join-network, leave-network, terminate)
• Modular structure with support for multiple database nodes and client handlers
• Threaded handling of multiple client connections using ExecutorService
• Command-line client interface for performing operations

Project Structure

• DatabaseNode.java - core logic and storage of a node in the distributed system
• ClientHandler.java - handles individual client connections via threads
• CommunicationModule.java - module for inter-node communication
• DatabaseClient.java - a terminal-based client for interacting with nodes
• NodeInfo.java - helper class storing IP and port for each node
• Logger.java - basic logger setup
• Server.java - server bootstrap logic

Sample Commands

# Starting a node
java DatabaseNode 12345

# Connecting client to the node
java DatabaseClient -gateway localhost:12345 -operation set-value 1:100