# vignesh-mathiyazhagan/railway_ticket_reservation_system architecture

> Architecture diagram of the GitHub repository vignesh-mathiyazhagan/railway_ticket_reservation_system, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-08-13). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/vignesh-mathiyazhagan/railway_ticket_reservation_system
- Repository: https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system

## Overview

#### Purpose and Entry Points
This is a console-based Java railway reservation simulator. It models booking, cancellation, RAC, and waiting-list behavior rather than a web or service application. Likely execution begins in `Ticket_Booking.java`, with `Ticket_System.java` coordinating reservation operations.

#### Console Application Boundary
The system runs as a local Java process and interacts through standard input/output. There are no indicated HTTP endpoints, databases, cloud services, or external infrastructure. Application state is likely held in memory for the process lifetime.

#### Passenger Domain Model
`Passenger.java` represents the core booking subject: a traveler and associated reservation details such as identity, berth preference, ticket status, or allocated seat. This object is passed between booking and system-management logic.

#### Reservation Orchestration
`Ticket_System.java` is the likely central domain/controller component. It owns available confirmed berths, RAC capacity, waiting-list capacity, and passenger collections/queues. It applies the business rules that decide whether a passenger receives a confirmed ticket, RAC placement, or waiting-list placement.

#### Booking Flow
`Ticket_Booking.java` likely collects user choices from the console and invokes booking behavior in `Ticket_System.java`. The primary flow is:
1. Read passenger/request data.
2. Create a `Passenger.java` instance.
3. Attempt confirmed berth allocation.
4. Fall back to RAC, then waiting list when capacity is exhausted.
5. Print resulting ticket or queue status.

#### Cancellation and Queue Promotion
Cancellation is a critical control-flow stage managed by `Ticket_System.java`. Releasing a confirmed berth should permit RAC passengers to move into confirmed status; RAC availability can then allow waiting-list passengers to advance. Queue ordering is architecturally important to preserve reservation fairness.

#### Runtime and State Constraints
The material runtime is the Java console/JVM. The repository contains no persistence layer, so reservation records, berth inventory, RAC entries, and waiting-list queues are expected to be transient in-memory state within `Ticket_System.java` and related domain objects.

Main entry points: [`Ticket_Booking.java`](https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system/blob/main/Ticket_Booking.java) (Ticket Booking), [`Ticket_System.java`](https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system/blob/main/Ticket_System.java) (Ticket System), [`Passenger.java`](https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system/blob/main/Passenger.java) (Passenger)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_runtime["Local Runtime"]
  node_console["Standard Input / Output<br/>console I/O"]
  node_jvm{{"Java Console Process<br/>JVM runtime"}}
end

subgraph group_application["Reservation Application"]
  node_booking["Ticket Booking<br/>console entry point"]
  node_ticket_system["Ticket System<br/>reservation orchestrator<br/>[Ticket_System.java]"]
  node_passenger["Passenger<br/>domain model<br/>[Passenger.java]"]
  node_booking_request["Booking Request<br/>interaction flow"]
  node_cancellation["Cancellation Request<br/>interaction flow"]
end

subgraph group_state["In-Memory Reservation State"]
  node_confirmed_berths[("Confirmed Berths<br/>seat inventory")]
  node_confirmed_passengers[("Confirmed Passengers<br/>passenger collection")]
  node_rac_queue["RAC Queue<br/>ordered reservation queue"]
  node_waiting_list["Waiting List<br/>ordered reservation queue"]
  node_reservation_status["Ticket Status<br/>allocation outcome"]
end

node_console -->|"user input"| node_booking
node_booking -->|"runs in"| node_jvm
node_booking -->|"collects"| node_booking_request
node_booking_request -->|"creates"| node_passenger
node_booking -->|"submits booking or cancellation"| node_ticket_system
node_ticket_system -->|"allocates or releases"| node_confirmed_berths
node_ticket_system -->|"maintains"| node_confirmed_passengers
node_ticket_system -->|"places and promotes"| node_rac_queue
node_ticket_system -->|"places and promotes"| node_waiting_list
node_ticket_system -->|"determines"| node_reservation_status
node_reservation_status -->|"prints result"| node_booking
node_booking -->|"collects"| node_cancellation
node_cancellation -->|"releases reservation"| node_ticket_system
node_rac_queue -.->|"promoted after cancellation"| node_confirmed_passengers
node_waiting_list -.->|"promoted when RAC opens"| node_rac_queue
node_booking -->|"ticket and queue status"| node_console

click node_booking "https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system/blob/main/Ticket_Booking.java"
click node_ticket_system "https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system/blob/main/Ticket_System.java"
click node_passenger "https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system/blob/main/Passenger.java"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_console,node_jvm toneBlue
class node_booking,node_ticket_system,node_passenger,node_booking_request,node_cancellation toneAmber
class node_confirmed_berths,node_confirmed_passengers,node_rac_queue,node_waiting_list,node_reservation_status toneMint
```

## Components

### Local Runtime

Single JVM process with console I/O.

- **Standard Input / Output**: console I/O
- **Java Console Process**: JVM runtime

### Reservation Application

- [Ticket Booking](https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system/blob/main/Ticket_Booking.java): console entry point · Reads commands and displays reservation results. · `Ticket_Booking.java`
- [Ticket System](https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system/blob/main/Ticket_System.java): reservation orchestrator · Applies booking, cancellation, and promotion rules. · `Ticket_System.java`
- [Passenger](https://github.com/vignesh-mathiyazhagan/railway_ticket_reservation_system/blob/main/Passenger.java): domain model · Traveler request and current reservation details. · `Passenger.java`
- **Booking Request**: interaction flow
- **Cancellation Request**: interaction flow

### In-Memory Reservation State

Transient state for the process lifetime.

- **Confirmed Berths**: seat inventory · Available and allocated confirmed seats.
- **Confirmed Passengers**: passenger collection
- **RAC Queue**: ordered reservation queue · Passengers eligible for promotion to confirmed status.
- **Waiting List**: ordered reservation queue · Passengers awaiting RAC availability.
- **Ticket Status**: allocation outcome · Confirmed, RAC, or waiting-list result.

## Connections

- Standard Input / Output → Ticket Booking: user input
- Ticket Booking → Java Console Process: runs in
- Ticket Booking → Booking Request: collects
- Booking Request → Passenger: creates
- Ticket Booking → Ticket System: submits booking or cancellation
- Ticket System → Confirmed Berths: allocates or releases
- Ticket System → Confirmed Passengers: maintains
- Ticket System → RAC Queue: places and promotes
- Ticket System → Waiting List: places and promotes
- Ticket System → Ticket Status: determines
- Ticket Status → Ticket Booking: prints result
- Ticket Booking → Cancellation Request: collects
- Cancellation Request → Ticket System: releases reservation
- RAC Queue → Confirmed Passengers: promoted after cancellation
- Waiting List → RAC Queue: promoted when RAC opens
- Ticket Booking → Standard Input / Output: ticket and queue status