Part5

package ua.nure.kudria.practice5;

import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Artem Kudria
 */
public final class Part5 {
    private static final String FILE_NAME = "part5.txt";
    private static final List<Thread> threadList = new ArrayList<>();

    private Part5() {
    }

    public static void main(String[] args) {
        try {
            final RandomAccessFile accessFile = new RandomAccessFile(FILE_NAME, "rw");
            for (int i = 0; i < 10; i++) {
                synchronized (accessFile) {
                    Thread thread = new Thread(new RandomThread(accessFile, i));
                    threadList.add(thread);
                    thread.start();
                }
            }
            synchronized (threadList) {
//                accessFile.close();
            }
        } catch (IOException e) {
            System.err.println(e.getMessage());
        }

        new Thread(() -> {
            synchronized (threadList) {
                try {
                    System.out.println(read());
                } catch (IOException e) {
                    System.err.println(e.getMessage());
                }
            }
        }).start();
    }

    public static String read() throws IOException {
        RandomAccessFile file;
        file = new RandomAccessFile(FILE_NAME, "r");
        String res = "";
        int b = file.read();
        while (b != -1) {
            res = res + (char) b;
            b = file.read();
        }
        file.close();

        return res;
    }
}

class RandomThread implements Runnable {
    private int number;
    private final RandomAccessFile randomAccessFile;

    public RandomThread(RandomAccessFile randomAccessFile, int number) {
        this.number = number;
        this.randomAccessFile = randomAccessFile;
    }

    @Override
    public void run() {
        synchronized (randomAccessFile) {
            try {
                randomAccessFile.seek(randomAccessFile.length());
                for (int i = 0; i < 20; i++) {
                    randomAccessFile.writeBytes(Integer.toString(number));
                    Thread.sleep(1);
                }
                randomAccessFile.write(System.lineSeparator().getBytes());
            } catch (IOException | InterruptedException e) {
                System.err.println(e.getMessage());
            }
        }
    }
}