Get last exception

[jflefebvre06]

Could you please add a way to get the last exception from a BackoffStrategy.

[elennick]

@jflefebvre06 - You can already check the last exception that generated a retry by looking in the Status object - look in the documentation here and let me know if this already covers what you are asking for: https://github.com/elennick/retry4j#call-status

[jflefebvre06]

No, Status is not accessible from BackoffStrategy

public interface BackoffStrategy {

    Duration getDurationToWait(int numberOfTriesFailed, Duration delayBetweenAttempts);

    default void validateConfig(RetryConfig config) {}

}

[elennick]

Could you share an example of what you're trying to get access to? Do you have your own custom BackoffStrategy implementation that contains logic that can throw an exception?

[jflefebvre06]

The use case is to manage http too many requests

Duration getDurationToWait(int numberOfTriesFailed, Duration delayBetweenAttempts) {

   if(exception.getHttpStatus()==429)
       return Duration.ofMinutes(1);
   else
       return Duration.ofSeconds(2);
}

[elennick]

@jflefebvre06 ok I understand... you want to be able to have more granular retry control over a single callable. Retry4j does not support this type of case at the moment. I'm not sure that implementing it inside a backoff strategy would be the correct approach... a better design would probably be to allow multiple retry configurations for a single callable, so that different configs could handle different exception types or return values. Please feel free to take a shot at an implementation and open a PR if you would like. Let me know if you want to discuss the design further before you do so. Thanks!