使用 retryTemplate 进行春季重试 - 单元测试

Question

我正在使用 retryTemplate，但我不知道如何为此进行单元测试。有人可以帮忙吗？

我有这段代码（例如），我想测试一下，我第一次调用 Card.create 失败，但第二次成功。

@Autowired
private RetryTemplate retryTemplate; 

public String registerCard(final String cardNumber) throws ApiException {  
    final Card response = retryTemplate.execute(new RetryCallback<Card, ApiException>() {
        @Override public Card doWithRetry(RetryContext retryContext) throws ApiException {
          return Card.create(map);
        }
     }) ;
     return response.get("number").toString();
}

RetryTemplate 的 maxAttemps = 2 和 backOff = 1500。

最好的问候。

Answer 1

在您的测试中，将RetryListener 实现添加到RetryTemplate；使用监听器上的方法来监控重试活动。

public interface RetryListener {

    /**
     * Called before the first attempt in a retry. For instance, implementers
     * can set up state that is needed by the policies in the
     * {@link RetryOperations}. The whole retry can be vetoed by returning
     * false from this method, in which case a {@link TerminatedRetryException}
     * will be thrown.
     *
     * @param <T> the type of object returned by the callback
     * @param <E> the type of exception it declares may be thrown
     * @param context the current {@link RetryContext}.
     * @param callback the current {@link RetryCallback}.
     * @return true if the retry should proceed.
     */
    <T, E extends Throwable> boolean open(RetryContext context, RetryCallback<T, E> callback);

    /**
     * Called after the final attempt (successful or not). Allow the interceptor
     * to clean up any resource it is holding before control returns to the
     * retry caller.
     * 
     * @param context the current {@link RetryContext}.
     * @param callback the current {@link RetryCallback}.
     * @param throwable the last exception that was thrown by the callback.
     * @param <E> the exception type
     * @param <T> the return value
     */
    <T, E extends Throwable> void close(RetryContext context, RetryCallback<T, E> callback, Throwable throwable);

    /**
     * Called after every unsuccessful attempt at a retry.
     * 
     * @param context the current {@link RetryContext}.
     * @param callback the current {@link RetryCallback}.
     * @param throwable the last exception that was thrown by the callback.
     * @param <T> the return value
     * @param <E> the exception to throw
     */
    <T, E extends Throwable> void onError(RetryContext context, RetryCallback<T, E> callback, Throwable throwable);
}