IP Address Counter

Overview

The IP Address Counter is a Kotlin-based application designed to read a file containing IP addresses, count the unique addresses, and output the result. The application is optimized for performance using multithreading and efficient data structures.

Features

• Read IP addresses from a file using memory buffer.
• Uses a custom IpAddressVector to store unique IP addresses efficiently.
• Multithreaded reading and processing using virtual threads and CompletableFuture.
• Optimized file reading in chunks for large files.
• Implement a subscriber-publisher pattern for processing file chunks.

Usage

• The FileReader class is responsible for reading the file in chunks and passing each chunk to a subscriber for processing.
• The IpAddressVector class stores unique IP addresses using a bit vector.
• The ScanChunkSubscriber class processes each chunk of data, extracts IP addresses, and updates the IpAddressVector.
• The application uses a subscriber-publisher pattern to efficiently handle file reading and processing:
  • FileReader acts as the publisher, reading chunks of the file and publishing them to subscribers.
  • ScanChunkSubscriber acts as the subscriber, receiving chunks from the FileReader and processing them to extract IP addresses.

Prerequisites

JDK 17 or higher.
Kotlin 2.0 or higher.

Run

java -jar ip-address-counter.jar

Where filename is the full path to the file containing the IP addresses.