RetryListener – Spring Retry

Spring Retry is a framework that allows you to add retry logic to your Spring applications. You can customize the retry behavior by implementing a RetryListener and attaching it to your retry configuration. In this example, I’ll show you how to create a custom RetryListener and configure it in a Spring Boot application.

First, let’s create a custom RetryListener:

import org.springframework.retry.RetryCallback;
import org.springframework.retry.RetryContext;
import org.springframework.retry.listener.RetryListenerSupport;

public class CustomRetryListener extends RetryListenerSupport {

    @Override
    public <T, E extends Throwable> void onError(RetryContext context, RetryCallback<T, E> callback, Throwable throwable) {
        System.out.println("CustomRetryListener: Retryable method failed with exception: " + throwable.getMessage());
        super.onError(context, callback, throwable);
    }
}

In this example, our custom RetryListener simply logs an error message when a retryable method fails.

Next, let’s configure Spring Retry with this custom RetryListener in a Spring Boot application:

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.retry.annotation.EnableRetry;
import org.springframework.retry.interceptor.RetryInterceptorBuilder;
import org.springframework.retry.interceptor.RetryOperationsInterceptor;
import org.springframework.retry.policy.SimpleRetryPolicy;
import org.springframework.retry.support.RetryTemplate;

@Configuration
@EnableRetry
public class RetryConfig {

    @Bean
    public RetryOperationsInterceptor customRetryInterceptor() {
        return RetryInterceptorBuilder
            .stateful()
            .backOffOptions(1000, 2.0, 10000) // Customize backoff options
            .maxAttempts(3) // Maximum number of retry attempts
            .retryPolicy(new SimpleRetryPolicy(3)) // Retry up to 3 times
            .listeners(new CustomRetryListener()) // Attach our custom listener
            .build();
    }

    @Bean
    public RetryTemplate retryTemplate(RetryOperationsInterceptor customRetryInterceptor) {
        RetryTemplate retryTemplate = new RetryTemplate();
        retryTemplate.setRetryPolicy(new SimpleRetryPolicy(3)); // Global retry policy
        retryTemplate.registerInterceptor(customRetryInterceptor); // Register custom interceptor
        return retryTemplate;
    }
}

In this configuration class:

We use @EnableRetry to enable Spring Retry functionality.
We define a custom RetryOperationsInterceptor bean called customRetryInterceptor. This interceptor configures various retry parameters, including the backoff options, maximum number of retry attempts, and attaches our custom RetryListener.
We also define a RetryTemplate bean called retryTemplate, which uses a global retry policy and registers our custom interceptor.

Now, you can use this retryTemplate bean in your service methods to add retry logic to them. Here’s an example:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.retry.RetryCallback;
import org.springframework.retry.support.RetryTemplate;
import org.springframework.stereotype.Service;

@Service
public class MyService {

    @Autowired
    private RetryTemplate retryTemplate;

    public void retryableMethod() throws Exception {
        retryTemplate.execute((RetryCallback<Void, Exception>) context -> {
            // Your retryable code here
            // If an exception is thrown, it will be retried according to the configuration
            // ...
            return null;
        });
    }
}

With this setup, the CustomRetryListener will log error messages whenever a retryable method fails, and the retry logic will be applied according to the configuration specified in the RetryConfig class. You can further customize the retry behavior by adjusting the parameters in the RetryInterceptorBuilder.

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