import java.io.File;

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.Callable;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.TimeoutException;

public class FilePathImporter {

/**

* Imports file paths from a list of file paths with a timeout.

*

* @param filePaths A list of file paths to import.

* @param timeoutMs The timeout in milliseconds.

* @return A list of valid file paths.

* @throws IllegalArgumentException if filePaths is null or empty, or timeoutMs is negative.

*/

public static List<String> importFilePathsWithTimeout(List<String> filePaths, long timeoutMs) {

if (filePaths == null || filePaths.isEmpty()) {

throw new IllegalArgumentException("File paths list cannot be null or empty.");

}

if (timeoutMs < 0) {

throw new IllegalArgumentException("Timeout must be a non-negative value.");

}

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

ExecutorService executor = Executors.newFixedThreadPool(filePaths.size()); //Use a thread pool for parallel processing.

for (String filePath : filePaths) {

Callable<String> task = () -> {

File file = new File(filePath);

if (file.exists() && file.isFile()) {

return filePath; // Return the path if it's a valid file.

} else {

return null; // Return null if it's not a valid file.

}

};

Future<String> future = executor.submit(task);

try {

String filePathResult = future.get(timeoutMs, java.util.concurrent.TimeUnit.MILLISECONDS); // Get the result with timeout

if (filePathResult != null) {

validFilePaths.add(filePathResult);

}

} catch (TimeoutException e) {

System.err.println("Timeout occurred while processing file: " + filePath);

// Handle timeout (e.g., log, retry, skip)

} catch (InterruptedException e) {

Thread.currentThread().interrupt();

System.err.println("Interrupted while processing file: " + filePath);

} catch (ExecutionException e) {

System.err.println("Exception while processing file: " + filePath + " - " + e.getMessage());

}

}

executor.shutdown(); // Shutdown the executor after all tasks are submitted.

return validFilePaths;

}

}