public class CSMA {

    private static final int TIMEOUT = 1000; // 超时时间，单位为毫秒

    private static final int MAX_DELAY = 200; // 最大延迟时间，单位为毫秒

    private static final int MIN_DELAY = 50; // 最小延迟时间，单位为毫秒

    private static final int NUM_SLOTS = 8; // 信道槽数

    private static final int SLOT_SIZE = 1; // 每个信道槽的大小

    private static final int NUM_PORTS = 4; // 端口数量

    private static final int PORT_SIZE = 8; // 每个端口的大小



    public static void main(String[] args) {

        int[] ports = new int[NUM_PORTS];

        for (int i = 0; i < NUM_PORTS; i++) {

            ports[i] = new int[PORT_SIZE];

            for (int j = 0; j < PORT_SIZE; j++) {

                ports[i][j] = -1; // 初始化为未使用状态

            }

        }



        // 模拟数据传输

        for (int i = 0; i < NUM_PORTS; i++) {

            for (int j = 0; j < PORT_SIZE; j++) {

                if (ports[i][j] == -1) {

                    sendData(i, j);

                    ports[i][j] = 1; // 表示数据已发送

                }

            }

        }



        // 模拟碰撞检测和重传

        for (int i = 0; i < NUM_PORTS; i++) {

            for (int j = 0; j < PORT_SIZE; j++) {

                if (ports[i][j] == 1) {

                    waitForTransmission(i, j);

                }

            }

        }

    }



    private static void sendData(int port, int slot) {

        // 发送数据到指定端口和槽位

        System.out.println("Sending data to port " + port + " at slot " + slot);

    }



    private static void waitForTransmission(int port, int slot) {

        // 等待指定端口和槽位的数据发送完成

        System.out.println("Waiting for transmission in port " + port + " at slot " + slot);

    }

}