import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.time.Duration;

import java.time.LocalDateTime;

import java.util.Scanner;

public class LogFilePerformance {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

System.out.println("Log File Performance Measurement Tool");

String logFilePath = promptForLogFilePath(scanner);

long fileSize = getFileSize(logFilePath);

long startTime = System.currentTimeMillis();

long linesRead = countLines(logFilePath);

long endTime = System.currentTimeMillis();

long duration = endTime - startTime;

double linesPerSecond = (double) linesRead / (duration / 1000);

System.out.println("\n--- Performance Results ---");

System.out.println("Log File: " + logFilePath);

System.out.println("File Size: " + fileSize + " bytes");

System.out.println("Lines Read: " + linesRead);

System.out.println("Time Taken: " + Duration.ofMillis(duration) + " ms");

System.out.println("Lines per Second: " + String.format("%.2f", linesPerSecond) + " lines/s");

scanner.close();

}

private static String promptForLogFilePath(Scanner scanner) {

System.out.print("Enter the path to the log file: ");

return scanner.nextLine();

}

private static long getFileSize(String filePath) {

try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {

long fileSize = 0;

long bufferSize = 1024;

byte[] buffer = new byte[bufferSize];

int bytesRead;

while ((bytesRead = reader.read(buffer)) != -1) {

fileSize += bytesRead;

}

return fileSize;

} catch (IOException e) {

System.err.println("Error getting file size: " + e.getMessage());

return -1; // Indicate an error.

}

}

private static long countLines(String filePath) {

try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {

long lineCount = 0;

String line;

while ((line = reader.readLine()) != null) {

lineCount++;

}

return lineCount;

} catch (IOException e) {

System.err.println("Error counting lines: " + e.getMessage());

return -1; // Indicate an error.

}

}

}