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Retries and exponential backoff for Spring AMQP.

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package io.jaconi.spring.rabbitmq.retry;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import lombok.RequiredArgsConstructor;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.config.ContainerCustomizer;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;

@AutoConfiguration(after = RabbitAutoConfiguration.class)
@ConditionalOnProperty(value = "jaconi.rabbitmq.listener.retry.enabled", havingValue = "true")
@EnableConfigurationProperties(RetryProperties.class)
@Import({RetryErrorHandler.class, RetryResourceConfiguration.class})
@RequiredArgsConstructor
public class RetryAutoConfiguration {
    private static final String NOOP_LOGGER = "io.jaconi.spring.rabbitmq.retry.noop";

    private final RetryErrorHandler retryErrorHandler;

    @Bean
    public ContainerCustomizer retryContainerCustomizer() {
        return container -> {
            // Use a custom error handler to take care of RetryMessageExceptions.
            container.setErrorHandler(retryErrorHandler);

            // Configure a noop logger. The only messages written to this logger are stack traces for
            // ImmediateAcknowledgeAmqpExceptions thrown due to RetryMessagesExceptions. These usually should not be
            // logged.
            var logger = (Logger) LoggerFactory.getLogger(NOOP_LOGGER);
            logger.setLevel(Level.OFF);
            container.setErrorHandlerLoggerName(NOOP_LOGGER);
        };
    }
}