Network Simulation

This network simulation project simulates the behavior of devices in a computer network. It is designed to demonstrate how events like packet transfers and device failures are processed within the network.

Components

Event

• Represents an event within the network.
• Each event has an ID, event type, start time, and optional attributes like source, destination, data etc.
• Event types include PACKET_TRANSFER and DEVICE_FAILURE.

SimulationController

• Manages the simulation and processes events.
• Uses a priority queue to schedule and execute events in chronological order.
• Handles data loss and calculates the total data loss count.
• Processes different event types like PACKET_TRANSFER and DEVICE_FAILURE.

JsonParser

• Parses a JSON configuration file to create network devices and events.
• Converts the JSON data into Java objects for the simulation.

Network

• Represents the computer network.
• Stores devices and their connections.
• Processes PACKET_TRANSFER events by forwarding packets between devices.
• Processes DEVICE_FAILURE events (to be implemented).

Main

• The entry point of the simulation.
• Reads the simulation configuration from a JSON file.
• Initializes the network, devices, and events.
• Starts the simulation by invoking the SimulationController.

Design Patterns Implementation

• Applied Singleton pattern to the Network class for centralized network management.
• Utilized Factory/Abstract Factory patterns for creating network devices, connections, and events dynamically.
• Strategy pattern implemented in event handling to allow different behaviors for packet transfers and receptions.
• Command pattern used in the SimulationController to encapsulate event processing.
• Decorator pattern introduced in connection classes to simulate data corruption and loss dynamically.

How to Run

1. Create a JSON configuration file with your desired network setup and events.

2. Update the jsonFilePath variable in the Main class to point to your JSON file.

3. Compile and run the Main class.

Example JSON Configuration

{
  "events": [
    {
      "id": "1",
      "eventType": "PACKET_TRANSFER",
      "startTime": "2024-01-10T10:00:00",
      "source": "DeviceA",
      "destination": "DeviceB",
      "data": "Hello, World!"
    },
    {
      "id": "2",
      "eventType": "DEVICE_FAILURE",
      "startTime": "2024-01-10T10:10:00",
      "device": "RouterC",
      "status": "FAILED"
    }
  ],
  "devices": [
    {
      "id": "DeviceA",
      "type": "EndDevice"
    },
    {
      "id": "DeviceB",
      "type": "EndDevice"
    },
    {
      "id": "RouterA",
      "type": "Router"
    }
  ],
  "connections": [
    {
      "source": "DeviceA",
      "destination": "DeviceB",
      "type": "Ethernet"
    }
  ]
}