RetryCallback – Spring Retry

Spring Retry is a powerful library that allows you to add retry logic to your Spring applications. To use Spring Retry with a RetryCallback and customize it, you can follow these steps:

Add Spring Retry Dependency: First, make sure you have the Spring Retry dependency in your project. You can add it to your Maven pom.xml or Gradle build.gradle: For Maven:

   <dependency>
       <groupId>org.springframework.retry</groupId>
       <artifactId>spring-retry</artifactId>
       <version>1.3.1</version> <!-- Use the latest version available -->
   </dependency>

For Gradle:

   implementation 'org.springframework.retry:spring-retry:1.3.1' // Use the latest version available

Create a Custom RetryCallback: You can create a custom implementation of the RetryCallback interface with your logic to be retried. The RetryCallback interface has a single method called doWithRetry, which is the method that will be retried when an exception is thrown. Here’s an example of a custom RetryCallback:

   import org.springframework.retry.RetryCallback;
   import org.springframework.retry.RetryContext;
   import org.springframework.retry.support.RetryTemplate;

   public class CustomRetryCallback<T> implements RetryCallback<T, RuntimeException> {

       @Override
       public T doWithRetry(RetryContext retryContext) throws RuntimeException {
           // Your custom logic here
           // For example, let's simulate a network call that might fail
           System.out.println("Executing the operation with retry...");
           if (Math.random() < 0.5) {
               throw new RuntimeException("Network call failed");
           }
           return (T) "Success";
       }
   }

Configure and Execute the Retry: To use the RetryTemplate to execute your custom RetryCallback, you can configure it in your Spring application configuration and then execute it. Here’s an example:

   import org.springframework.context.annotation.Bean;
   import org.springframework.context.annotation.Configuration;
   import org.springframework.retry.annotation.EnableRetry;
   import org.springframework.retry.annotation.Retryable;
   import org.springframework.retry.support.RetryTemplate;

   @Configuration
   @EnableRetry // Enable Spring Retry
   public class AppConfig {

       @Bean
       public RetryTemplate retryTemplate() {
           return new RetryTemplate();
       }
   }

   public class MainApplication {

       public static void main(String[] args) {
           // Create an instance of the RetryTemplate
           RetryTemplate retryTemplate = new AnnotationConfigApplicationContext(AppConfig.class).getBean(RetryTemplate.class);

           // Create a custom RetryCallback
           CustomRetryCallback<String> customRetryCallback = new CustomRetryCallback<>();

           // Execute the RetryCallback using RetryTemplate
           String result = retryTemplate.execute(customRetryCallback);

           System.out.println("Final Result: " + result);
       }
   }

In this example, we’ve enabled Spring Retry with @EnableRetry, configured a RetryTemplate in the AppConfig class, and executed the custom RetryCallback using the RetryTemplate. The RetryTemplate will automatically retry the doWithRetry method in case an exception is thrown, based on the default retry settings. You can further customize the retry behavior by configuring the RetryTemplate.

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