如何在 Spring 重试(Spring Boot)中配置延迟时间

Question

是否可以配置@Retryable？此方法(getCurrentRate)将被调用 3 次。首先是5分钟，之后是10分钟，最后是15分钟。我该如何配置？

@Retryable(maxAttempts=3,value=RuntimeException.class,backoff = @Backoff(delay = 1000))

例

public class RealExchangeRateCalculator implements ExchangeRateCalculator {
private static final double BASE_EXCHANGE_RATE = 1.09;
private int attempts = 0;
private SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
@Retryable(maxAttempts=3,value=RuntimeException.class,backoff = @Backoff(delay = 1000))
public Double getCurrentRate() {
System.out.println("Calculating - Attempt " + attempts + " at " + sdf.format(new Date()));
attempts++;
try {
HttpResponse<JsonNode> response = Unirest.get("http://rate-exchange.herokuapp.com/fetchRate")
.queryString("from", "EUR")
.queryString("to","USD")
.asJson();
switch (response.getStatus()) {
case 200:
return response.getBody().getObject().getDouble("Rate");
case 503:
throw new RuntimeException("Server Response: " + response.getStatus());
default:
throw new IllegalStateException("Server not ready");
}
} catch (UnirestException e) {
throw new RuntimeException(e);
}
}
@Recover
public Double recover(RuntimeException e){
System.out.println("Recovering - returning safe value");
return BASE_EXCHANGE_RATE;
}
}

Answer 1

您可以使用以下配置来实现这一点：

@Retryable(
maxAttempts=3,
value=RuntimeException.class,
backoff = @Backoff(
delay = 300000,
multiplier = 2,
maxDelay = 900000
)
)

---

调用：

1. 5m~Delay = 300000后
2. 10m~Delay = 300000 * 2 = 600000后
3. 15m~Delay = 600000 * 2 = 1200000 with Max Delay of 900000后