Java tutorial
import java.nio.ByteBuffer; import java.nio.channels.AsynchronousFileChannel; import java.nio.file.Path; import java.nio.file.Paths; import java.util.concurrent.Future; public class Test { public static void main(String[] args) throws Exception { Path file = Paths.get("/usr/a.txt"); AsynchronousFileChannel channel = AsynchronousFileChannel.open(file); ByteBuffer buffer = ByteBuffer.allocate(100_000); Future<Integer> result = channel.read(buffer, 0); while (!result.isDone()) { ProfitCalculator.calculateTax(); } Integer bytesRead = result.get(); System.out.println("Bytes read [" + bytesRead + "]"); } } class ProfitCalculator { public ProfitCalculator() { } public static void calculateTax() { } }