CIS 656 Final: Peer-to-Peer Network with Central Server

This application implements a distributed peer-to-peer (P2P) system with a central server for peer registration and neighbor assignment. The system is designed to demonstrate communication, concurrency, and P2P architecture.

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Features

Central Server

• Peer Registration:
  Peers register themselves to the central server, which assigns them to an existing peer in the network if available.
• Neighbor Management:
  Tracks connected peers and assigns a random peer to newly joining peers.
• Commands:
  • members: Displays a list of all currently connected peers.
  • quit: Shuts down the central server (no new peers can join afterward).
• Note:
  The Server does not track the topology of the peer network at the moment. Upon subsequent reconnects from Peers they are not saved to the internal List of Peers.

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Peer

• Connect to Server:
  Peers connect to the central server to join the network.
• Neighbor Management:
  Peers manage their direct (one-hop) neighbors, allowing a maximum of 3 neighbors.
• Redirection Logic:
  If a peer is full (has 3 neighbors), it redirects new connections to one of its existing neighbors.
• Commands:
  • neighbors: Displays the peer's current neighbors.
  • server status: Checks if the peer is connected to the central server and displays the server status.
  • reconnect: Attempts to reconnect to the central server if the connection is lost.
  • quit: Disconnects from the server and all neighbors, notifying them of the disconnection.

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How to Run

Prerequisites

• Java Development Kit (JDK) 8 or higher.
• IntelliJ IDEA or any other Java IDE (optional but recommended).

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Running the Central Server and Peer

1. Compiling and running the server:

   bash scripts/run_server.sh
   

2. Compile the peer:

   bash scripts/run_peer.sh

3. If you would like to specify the peer port

   bash scripts/run_peer.sh 5001