Grokking Spring Boot
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Retries and Concurrency Limits

@Retryable(includes = HttpServerErrorException.class, maxRetries = 3, delay = 200, multiplier = 2)
@ConcurrencyLimit(limitString = "${booking.payments.concurrency-limit:10}")
public PaymentResult charge(String email, int amountInCents, String idempotencyKey) {

These two lines on PaymentClient.charge change how the booking service treats the payment provider. The first says: when the provider answers with a 5xx status, try again up to three more times, waiting longer before each attempt

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