import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

public class LogDiff {

private static final int RATE_LIMIT = 100; // Lines per second

private static final long TIME_WINDOW = 1000; // milliseconds

public static void main(String[] args) throws IOException {

if (args.length != 2) {

System.out.println("Usage: java LogDiff <file1> <file2>");

return;

}

String file1 = args[0];

String file2 = args[1];

Map<String, Integer> file1Counts = calculateLogCounts(file1);

Map<String, Integer> file2Counts = calculateLogCounts(file2);

List<String> diffs = findDifferences(file1Counts, file2Counts);

for (String diff : diffs) {

System.out.println(diff);

}

}

private static Map<String, Integer> calculateLogCounts(String filePath) throws IOException {

Map<String, Integer> counts = new ConcurrentHashMap<>();

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

String line;

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

String trimmedLine = line.trim();

if(!trimmedLine.isEmpty()) {

counts.put(trimmedLine, counts.getOrDefault(trimmedLine, 0) + 1);

}

}

}

return counts;

}

private static List<String> findDifferences(Map<String, Integer> file1Counts, Map<String, Integer> file2Counts) {

List<String> diffs = new ArrayList<>();

// Find lines present in file1 but not in file2

for (Map.Entry<String, Integer> entry : file1Counts.entrySet()) {

if (!file2Counts.containsKey(entry.getKey())) {

diffs.add("Only in " + file1Counts.keySet().iterator().next() + ": " + entry.getKey() + " (" + entry.getValue() + ")");

}

}

// Find lines present in file2 but not in file1

for (Map.Entry<String, Integer> entry : file2Counts.entrySet()) {

if (!file1Counts.containsKey(entry.getKey())) {

diffs.add("Only in " + file2Counts.keySet().iterator().next() + ": " + entry.getKey() + " (" + entry.getValue() + ")");

}

}

// Find lines with different counts

for (Map.Entry<String, Integer> entry : file1Counts.entrySet()) {

if (file2Counts.containsKey(entry.getKey()) && entry.getValue() != file2Counts.get(entry.getKey())) {

diffs.add("Different count for: " + entry.getKey() + " (File1: " + entry.getValue() + ", File2: " + file2Counts.get(entry.getKey()) + ")");

}

}

return diffs;

}

}