Java中Retry方法的简单实现

public class Retry {
    public static <T> T retry(Callable<T> callable, int num) {
        Retry.check(num >= 1, "次数需要大于0");
        Exception exception = null;
        for (int i = 0; i < num; i++) {
            try {
                return callable.call();
            } catch (Exception e) {
                exception = e;
            }
        }
        throw Retry.runtimeException(exception);
    }
    public static void retry(Runnable runnable, int num) {
        Retry.check(num >= 1, "次数需要大于0");
        Exception exception = null;
        for (int i = 0; i < num; i++) {
            try {
                runnable.run();
                return;
            } catch (Exception e) {
                exception = e;
            }
        }
        throw Retry.runtimeException(exception);
    }
    public static void check(boolean check, String message) {
        if (!check) {
            if (Objects.isNull(message)) {
                throw new IllegalArgumentException("Check Requirement Error.");
            } else {
                throw new IllegalArgumentException("Check Requirement Error:" + message);
            }
        }
    }
    public static RuntimeException runtimeException(Exception exception) {
        Retry.check(Objects.nonNull(exception), "传入参数为null");
        if (exception instanceof RuntimeException) {
            throw new RuntimeException(exception);
        }
        throw new RuntimeException();
    }
}

public class RetryTest implements Runnable{
    public static void main(String[] args) {
        RetryTest test=new RetryTest();
        //直接用Runnable做参数，可以换成Callable的实例
        Retry.retry(test, 3);
        //使用方法做参数
        Retry.retry(()->supplierTestNoReturn("a"), 3);
        //使用方法做参数接受返回值
        String back = Retry.retry(()->supplierTest("a"), 3);
        System.out.println(back);
        //直接写有返回值
        Retry.retry(()->{
            //TODO 业务逻辑调用外部API等等
            System.out.println("返回值");
            return "返回值";
        }, 3);
 		//直接写无返回值
        Retry.retry(()->{
            //TODO 业务逻辑调用外部API等等
            System.out.println("无返回值");
        }, 3);
    }
    //非静态直接使用
    public void test(){
        Retry.retry(()->normal("aa"), 3);
    }
    @Override
    public void run() {
        //TODO 业务逻辑、调用外部API等等
        System.out.println("Runnable Test");
    }
    public static String supplierTest(String str){
        //TODO 业务逻辑、调用外部API等等
        return "Test "+ str;
    }
    public static void supplierTestNoReturn(String str){
        //TODO 业务逻辑、调用外部API等等
        System.out.println("No Return "+str);
    }
    public String normal(String a){
        //TODO 业务逻辑、调用外部API等等
        return "Test";
    }
}

    public static <T> T retry(Supplier<T> supplier, int num) {
        Retry.check(num >= 1, "次数需要大于0");
        Exception exception = null;
        for (int i = 0; i < num; i++) {
            try {
                return supplier.get();
            } catch (Exception e) {
                exception = e;
            }
        }
        throw Retry.runtimeException(exception);
    }