{"id":1945,"date":"2024-06-19T17:56:35","date_gmt":"2024-06-19T17:56:35","guid":{"rendered":"https:\/\/www.w3computing.com\/articles\/?p=1945"},"modified":"2024-06-19T17:56:40","modified_gmt":"2024-06-19T17:56:40","slug":"how-to-implement-circuit-breaker-pattern-in-java-with-resilience4j","status":"publish","type":"post","link":"https:\/\/www.w3computing.com\/articles\/how-to-implement-circuit-breaker-pattern-in-java-with-resilience4j\/","title":{"rendered":"How to Implement Circuit Breaker Pattern in Java with Resilience4j"},"content":{"rendered":"\n

Introduction<\/h2>\n\n\n\n

The Circuit Breaker pattern is a design pattern used in software development to prevent cascading failures in distributed systems. It helps to handle the failure of services gracefully and ensures that the system remains responsive by avoiding repeated failed calls. Resilience4j is a lightweight, easy-to-use fault tolerance library inspired by Netflix Hystrix but designed for Java 8 and functional programming. In this tutorial, we’ll explore how to implement the Circuit Breaker pattern in Java using Resilience4j.<\/p>\n\n\n\n

1. Introduction to Circuit Breaker Pattern<\/h2>\n\n\n\n

The Circuit Breaker pattern helps to manage and prevent the failure of a service or network call. It works similarly to an electrical circuit breaker. When a service repeatedly fails, the circuit breaker trips and stops further calls to the failing service for a specified period, allowing it to recover.<\/p>\n\n\n\n

States of a Circuit Breaker<\/h3>\n\n\n\n

A Circuit Breaker typically has three states:<\/p>\n\n\n\n

    \n
  1. Closed<\/strong>: All requests are allowed to pass through. If the number of failures exceeds a threshold, the circuit breaker transitions to the Open state.<\/li>\n\n\n\n
  2. Open<\/strong>: All requests are immediately failed for a specified period (timeout). After this period, the circuit breaker transitions to the Half-Open state.<\/li>\n\n\n\n
  3. Half-Open<\/strong>: A limited number of requests are allowed to pass through to test if the underlying issue has been resolved. If successful, the circuit breaker transitions back to the Closed state; if not, it returns to the Open state.<\/li>\n<\/ol>\n\n\n\n

    2. Overview of Resilience4j<\/h2>\n\n\n\n

    Resilience4j is a lightweight, flexible, and easy-to-use library designed to handle fault tolerance in Java applications. It provides various modules, including Circuit Breaker, Retry, Rate Limiter, Bulkhead, and Time Limiter. Resilience4j is designed with a functional programming approach, leveraging Java 8 features like lambdas and functional interfaces.<\/p>\n\n\n\n

    Key Features of Resilience4j<\/h3>\n\n\n\n
      \n
    • Lightweight and fast<\/li>\n\n\n\n
    • Functional programming support<\/li>\n\n\n\n
    • Asynchronous and reactive support<\/li>\n\n\n\n
    • Easy integration with popular frameworks (Spring Boot, RxJava, etc.)<\/li>\n\n\n\n
    • Detailed metrics and monitoring capabilities<\/li>\n<\/ul>\n\n\n\n

      3. Setting up the Project<\/h2>\n\n\n\n

      Let’s start by setting up a simple Java project with Maven and adding the necessary dependencies for Resilience4j.<\/p>\n\n\n\n

      Maven Project Setup<\/h3>\n\n\n\n

      Create a new Maven project and add the following dependencies to your pom.xml<\/code> file:<\/p>\n\n\n

      <project<\/span> xmlns<\/span>=\"http:\/\/maven.apache.org\/POM\/4.0.0\"<\/span>\n         xmlns:xsi<\/span>=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"<\/span>\n         xsi:schemaLocation<\/span>=\"http:\/\/maven.apache.org\/POM\/4.0.0 http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\"<\/span>><\/span>\n    <modelVersion<\/span>><\/span>4.0.0<\/modelVersion<\/span>><\/span>\n\n    <groupId<\/span>><\/span>com.example<\/groupId<\/span>><\/span>\n    <artifactId<\/span>><\/span>resilience4j-demo<\/artifactId<\/span>><\/span>\n    <version<\/span>><\/span>1.0-SNAPSHOT<\/version<\/span>><\/span>\n\n    <dependencies<\/span>><\/span>\n        <!-- Resilience4j dependencies --><\/span>\n        <dependency<\/span>><\/span>\n            <groupId<\/span>><\/span>io.github.resilience4j<\/groupId<\/span>><\/span>\n            <artifactId<\/span>><\/span>resilience4j-all<\/artifactId<\/span>><\/span>\n            <version<\/span>><\/span>1.7.1<\/version<\/span>><\/span>\n        <\/dependency<\/span>><\/span>\n        <!-- Jackson for JSON processing --><\/span>\n        <dependency<\/span>><\/span>\n            <groupId<\/span>><\/span>com.fasterxml.jackson.core<\/groupId<\/span>><\/span>\n            <artifactId<\/span>><\/span>jackson-databind<\/artifactId<\/span>><\/span>\n            <version<\/span>><\/span>2.13.3<\/version<\/span>><\/span>\n        <\/dependency<\/span>><\/span>\n        <!-- SLF4J for logging --><\/span>\n        <dependency<\/span>><\/span>\n            <groupId<\/span>><\/span>org.slf4j<\/groupId<\/span>><\/span>\n            <artifactId<\/span>><\/span>slf4j-api<\/artifactId<\/span>><\/span>\n            <version<\/span>><\/span>1.7.32<\/version<\/span>><\/span>\n        <\/dependency<\/span>><\/span>\n        <dependency<\/span>><\/span>\n            <groupId<\/span>><\/span>org.slf4j<\/groupId<\/span>><\/span>\n            <artifactId<\/span>><\/span>slf4j-simple<\/artifactId<\/span>><\/span>\n            <version<\/span>><\/span>1.7.32<\/version<\/span>><\/span>\n        <\/dependency<\/span>><\/span>\n    <\/dependencies<\/span>><\/span>\n<\/project<\/span>><\/span><\/code><\/span>Code language:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
      4. Implementing Circuit Breaker with Resilience4j<\/h2>\n\n\n\n
      Now, let’s implement a simple service with a Circuit Breaker using Resilience4j. We’ll create a service that makes a network call to a mock API.<\/p>\n\n\n\n
      Creating the Service Class<\/h3>\n\n\n\n
      Create a new class RemoteService<\/code> that simulates a network call:<\/p>\n\n\n
      package<\/span> com.example.resilience4j;\n\nimport<\/span> java.net.HttpURLConnection;\nimport<\/span> java.net.URL;\nimport<\/span> java.util.Scanner;\n\npublic<\/span> class<\/span> RemoteService<\/span> <\/span>{\n\n    public<\/span> String fetchData<\/span>()<\/span> throws<\/span> Exception <\/span>{\n        URL url = new<\/span> URL(\"https:\/\/jsonplaceholder.typicode.com\/posts\/1\"<\/span>);\n        HttpURLConnection conn = (HttpURLConnection) url.openConnection();\n        conn.setRequestMethod(\"GET\"<\/span>);\n        conn.connect();\n\n        int<\/span> responseCode = conn.getResponseCode();\n        if<\/span> (responseCode != 200<\/span>) {\n            throw<\/span> new<\/span> RuntimeException(\"Failed : HTTP error code : \"<\/span> + responseCode);\n        }\n\n        Scanner scanner = new<\/span> Scanner(url.openStream());\n        StringBuilder response = new<\/span> StringBuilder();\n        while<\/span> (scanner.hasNext()) {\n            response.append(scanner.nextLine());\n        }\n        scanner.close();\n\n        return<\/span> response.toString();\n    }\n}<\/code><\/span>Code language:<\/span> Java<\/span> (<\/span>java<\/span>)<\/span><\/small><\/pre>\n\n\n
      Wrapping the Service Call with Circuit Breaker<\/h3>\n\n\n\n
      Create a new class ServiceWithCircuitBreaker<\/code> that wraps the RemoteService<\/code> call with a Circuit Breaker:<\/p>\n\n\n
      package<\/span> com.example.resilience4j;\n\nimport<\/span> io.github.resilience4j.circuitbreaker.CircuitBreaker;\nimport<\/span> io.github.resilience4j.circuitbreaker.CircuitBreakerConfig;\nimport<\/span> io.github.resilience4j.circuitbreaker.CircuitBreakerRegistry;\nimport<\/span> io.github.resilience4j.decorators.Decorators;\nimport<\/span> org.slf4j.Logger;\nimport<\/span> org.slf4j.LoggerFactory;\n\nimport<\/span> java.time.Duration;\nimport<\/span> java.util.function.Supplier;\n\npublic<\/span> class<\/span> ServiceWithCircuitBreaker<\/span> <\/span>{\n\n    private<\/span> static<\/span> final<\/span> Logger logger = LoggerFactory.getLogger(ServiceWithCircuitBreaker.class<\/span>)<\/span>;\n    private<\/span> final<\/span> RemoteService remoteService;\n    private<\/span> final<\/span> CircuitBreaker circuitBreaker;\n\n    public<\/span> ServiceWithCircuitBreaker<\/span>(RemoteService remoteService)<\/span> <\/span>{\n        this<\/span>.remoteService = remoteService;\n\n        CircuitBreakerConfig config = CircuitBreakerConfig.custom()\n                .failureRateThreshold(50<\/span>)\n                .waitDurationInOpenState(Duration.ofMillis(1000<\/span>))\n                .slidingWindowSize(2<\/span>)\n                .build();\n\n        CircuitBreakerRegistry registry = CircuitBreakerRegistry.of(config);\n        this<\/span>.circuitBreaker = registry.circuitBreaker(\"remoteService\"<\/span>);\n    }\n\n    public<\/span> String fetchData<\/span>()<\/span> <\/span>{\n        Supplier<String> decoratedSupplier = Decorators.ofSupplier(remoteService::fetchData)\n                .withCircuitBreaker(circuitBreaker)\n                .decorate();\n\n        try<\/span> {\n            return<\/span> decoratedSupplier.get();\n        } catch<\/span> (Exception e) {\n            logger.error(\"Error during fetchData call\"<\/span>, e);\n            return<\/span> \"Fallback response\"<\/span>;\n        }\n    }\n}<\/code><\/span>Code language:<\/span> Java<\/span> (<\/span>java<\/span>)<\/span><\/small><\/pre>\n\n\n
      Testing the Circuit Breaker<\/h3>\n\n\n\n
      Create a Main<\/code> class to test the Circuit Breaker:<\/p>\n\n\n
      package<\/span> com.example.resilience4j;\n\npublic<\/span> class<\/span> Main<\/span> <\/span>{\n\n    public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span> <\/span>{\n        RemoteService remoteService = new<\/span> RemoteService();\n        ServiceWithCircuitBreaker serviceWithCircuitBreaker = new<\/span> ServiceWithCircuitBreaker(remoteService);\n\n        for<\/span> (int<\/span> i = 0<\/span>; i < 10<\/span>; i++) {\n            String response = serviceWithCircuitBreaker.fetchData();\n            System.out.println(\"Response: \"<\/span> + response);\n        }\n    }\n}<\/code><\/span>Code language:<\/span> Java<\/span> (<\/span>java<\/span>)<\/span><\/small><\/pre>\n\n\n
      5. Advanced Configuration<\/h2>\n\n\n\n
      Resilience4j provides extensive configuration options for the Circuit Breaker. Let’s explore some advanced configurations.<\/p>\n\n\n\n
      Circuit Breaker Configuration Parameters<\/h3>\n\n\n\n
        \n
      • failureRateThreshold<\/strong>: The failure rate threshold in percentage. When the failure rate is equal to or greater than this threshold, the Circuit Breaker transitions to the Open state.<\/li>\n\n\n\n
      • waitDurationInOpenState<\/strong>: The time the Circuit Breaker stays in the Open state before transitioning to Half-Open.<\/li>\n\n\n\n
      • slidingWindowType<\/strong>: The type of the sliding window which is used to record the outcome of calls. The window can either be count-based or time-based.<\/li>\n\n\n\n
      • slidingWindowSize<\/strong>: The size of the sliding window. If the sliding window is count-based, it represents the number of calls. If it is time-based, it represents the duration in seconds.<\/li>\n\n\n\n
      • permittedNumberOfCallsInHalfOpenState<\/strong>: The number of permitted calls when the Circuit Breaker is in the Half-Open state.<\/li>\n\n\n\n
      • minimumNumberOfCalls<\/strong>: The minimum number of calls which are required before the Circuit Breaker can calculate the error rate.<\/li>\n\n\n\n
      • automaticTransitionFromOpenToHalfOpenEnabled<\/strong>: If set to true, the Circuit Breaker will automatically transition from Open to Half-Open state after the wait duration.<\/li>\n<\/ul>\n\n\n\n
        Example of Advanced Configuration<\/h3>\n\n\n
        CircuitBreakerConfig advancedConfig = CircuitBreakerConfig.custom()\n        .failureRateThreshold(50<\/span>)\n        .waitDurationInOpenState(Duration.ofSeconds(1<\/span>))\n        .slidingWindowType(CircuitBreakerConfig.SlidingWindowType.COUNT_BASED)\n        .slidingWindowSize(10<\/span>)\n        .permittedNumberOfCallsInHalfOpenState(3<\/span>)\n        .minimumNumberOfCalls(5<\/span>)\n        .automaticTransitionFromOpenToHalfOpenEnabled(true<\/span>)\n        .build();<\/code><\/span>Code language:<\/span> Java<\/span> (<\/span>java<\/span>)<\/span><\/small><\/pre>\n\n\n
        6. Monitoring and Metrics<\/h2>\n\n\n\n
        Resilience4j provides detailed metrics for monitoring the Circuit Breaker state and performance. These metrics can be integrated with monitoring tools like Prometheus and<\/p>\n\n\n\n
        Grafana.<\/p>\n\n\n\n
        Enabling Metrics<\/h3>\n\n\n\n
        Add the resilience4j-micrometer<\/code> dependency to your pom.xml<\/code>:<\/p>\n\n\n
        <dependency<\/span>><\/span>\n    <groupId<\/span>><\/span>io.github.resilience4j<\/groupId<\/span>><\/span>\n    <artifactId<\/span>><\/span>resilience4j-micrometer<\/artifactId<\/span>><\/span>\n    <version<\/span>><\/span>1.7.1<\/version<\/span>><\/span>\n<\/dependency<\/span>><\/span><\/code><\/span>Code language:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
        Example of Metrics Integration<\/h3>\n\n\n
        package<\/span> com.example.resilience4j;\n\nimport<\/span> io.github.resilience4j.circuitbreaker.CircuitBreaker;\nimport<\/span> io.github.resilience4j.circuitbreaker.CircuitBreakerConfig;\nimport<\/span> io.github.resilience4j.circuitbreaker.CircuitBreakerRegistry;\nimport<\/span> io.github.resilience4j.micrometer.CircuitBreakerMetrics;\nimport<\/span> io.micrometer.core.instrument.MeterRegistry;\nimport<\/span> io.micrometer.core.instrument.simple.SimpleMeterRegistry;\n\npublic<\/span> class<\/span> MetricsExample<\/span> <\/span>{\n\n    public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span> <\/span>{\n        MeterRegistry meterRegistry = new<\/span> SimpleMeterRegistry();\n\n        CircuitBreakerConfig config = CircuitBreakerConfig.custom()\n                .failureRateThreshold(50<\/span>)\n                .waitDurationInOpenState(Duration.ofMillis(1000<\/span>))\n                .slidingWindowSize(2<\/span>)\n                .build();\n\n        CircuitBreakerRegistry registry = CircuitBreakerRegistry.of(config);\n        CircuitBreaker circuitBreaker = registry.circuitBreaker(\"remoteService\"<\/span>);\n\n        CircuitBreakerMetrics.ofCircuitBreakerRegistry(meterRegistry, registry);\n\n        \/\/ Now the metrics are available for monitoring<\/span>\n    }\n}<\/code><\/span>Code language:<\/span> Java<\/span> (<\/span>java<\/span>)<\/span><\/small><\/pre>\n\n\n
        7. Example Use Cases<\/h2>\n\n\n\n
        Scenario 1: Remote API Calls<\/h3>\n\n\n\n
        A common use case for the Circuit Breaker pattern is protecting remote API calls. If an external API is experiencing issues, the Circuit Breaker can prevent your application from being overwhelmed by failing requests.<\/p>\n\n\n
        public<\/span> class<\/span> RemoteApiService<\/span> <\/span>{\n\n    private<\/span> final<\/span> CircuitBreaker circuitBreaker;\n\n    public<\/span> RemoteApiService<\/span>()<\/span> <\/span>{\n        CircuitBreakerConfig config = CircuitBreakerConfig.custom()\n                .failureRateThreshold(50<\/span>)\n                .waitDurationInOpenState(Duration.ofSeconds(5<\/span>))\n                .slidingWindowSize(10<\/span>)\n                .build();\n\n        CircuitBreakerRegistry registry = CircuitBreakerRegistry.of(config);\n        this<\/span>.circuitBreaker = registry.circuitBreaker(\"remoteApiService\"<\/span>);\n    }\n\n    public<\/span> String callApi<\/span>()<\/span> <\/span>{\n        Supplier<String> decoratedSupplier = Decorators.ofSupplier(this<\/span>::fetchDataFromApi)\n                .withCircuitBreaker(circuitBreaker)\n                .decorate();\n\n        try<\/span> {\n            return<\/span> decoratedSupplier.get();\n        } catch<\/span> (Exception e) {\n            return<\/span> \"Fallback response\"<\/span>;\n        }\n    }\n\n    private<\/span> String fetchDataFromApi<\/span>()<\/span> <\/span>{\n        \/\/ Simulate API call<\/span>\n        return<\/span> \"API response\"<\/span>;\n    }\n}<\/code><\/span>Code language:<\/span> Java<\/span> (<\/span>java<\/span>)<\/span><\/small><\/pre>\n\n\n
        Scenario 2: Database Operations<\/h3>\n\n\n\n
        Another use case is protecting database operations. If the database is experiencing high latency or downtime, the Circuit Breaker can prevent your application from making repeated failed calls.<\/p>\n\n\n
        public<\/span> class<\/span> DatabaseService<\/span> <\/span>{\n\n    private<\/span> final<\/span> CircuitBreaker circuitBreaker;\n\n    public<\/span> DatabaseService<\/span>()<\/span> <\/span>{\n        CircuitBreakerConfig config = CircuitBreakerConfig.custom()\n                .failureRateThreshold(50<\/span>)\n                .waitDurationInOpenState(Duration.ofSeconds(2<\/span>))\n                .slidingWindowSize(5<\/span>)\n                .build();\n\n        CircuitBreakerRegistry registry = CircuitBreakerRegistry.of(config);\n        this<\/span>.circuitBreaker = registry.circuitBreaker(\"databaseService\"<\/span>);\n    }\n\n    public<\/span> String fetchData<\/span>()<\/span> <\/span>{\n        Supplier<String> decoratedSupplier = Decorators.ofSupplier(this<\/span>::queryDatabase)\n                .withCircuitBreaker(circuitBreaker)\n                .decorate();\n\n        try<\/span> {\n            return<\/span> decoratedSupplier.get();\n        } catch<\/span> (Exception e) {\n            return<\/span> \"Fallback response\"<\/span>;\n        }\n    }\n\n    private<\/span> String queryDatabase<\/span>()<\/span> <\/span>{\n        \/\/ Simulate database query<\/span>\n        return<\/span> \"Database result\"<\/span>;\n    }\n}<\/code><\/span>Code language:<\/span> Java<\/span> (<\/span>java<\/span>)<\/span><\/small><\/pre>\n\n\n
        8. Best Practices<\/h2>\n\n\n\n
          \n
        • Set appropriate thresholds<\/strong>: Configure the failure rate threshold, wait duration, and other parameters according to your application’s requirements.<\/li>\n\n\n\n
        • Monitor and tune<\/strong>: Continuously monitor the Circuit Breaker metrics and tune the configuration based on the observed behavior.<\/li>\n\n\n\n
        • Fallback strategies<\/strong>: Implement appropriate fallback strategies to handle failures gracefully.<\/li>\n\n\n\n
        • Use bulkheads<\/strong>: Combine the Circuit Breaker pattern with Bulkhead pattern to limit the number of concurrent calls to a resource.<\/li>\n\n\n\n
        • Test thoroughly<\/strong>: Test the Circuit Breaker behavior under different failure scenarios to ensure it works as expected.<\/li>\n<\/ul>\n\n\n\n
          9. Conclusion<\/h2>\n\n\n\n
          In this tutorial, we’ve explored how to implement the Circuit Breaker pattern in Java using Resilience4j. We’ve covered the basics of the Circuit Breaker pattern, set up a Java project with Resilience4j, and implemented a simple service with a Circuit Breaker. We’ve also looked at advanced configuration options, monitoring and metrics, example use cases, and best practices.<\/p>\n\n\n\n
          By following this tutorial, you can enhance the fault tolerance of your Java applications and ensure they remain responsive even when facing failures in external services or resources. Resilience4j provides a powerful and flexible way to implement the Circuit Breaker pattern, making it an essential tool for building resilient distributed systems.<\/p>\n","protected":false},"excerpt":{"rendered":"
          Introduction The Circuit Breaker pattern is a design pattern used in software development to prevent cascading failures in distributed systems. It helps to handle the failure of services gracefully and ensures that the system remains responsive by avoiding repeated failed calls. Resilience4j is a lightweight, easy-to-use fault tolerance library inspired by Netflix Hystrix but designed […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[5,4],"tags":[],"class_list":["post-1945","post","type-post","status-publish","format-standard","category-java","category-programming-languages","entry"],"yoast_head":"\nHow to Implement Circuit 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