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BAEL-3649 Quick Guide to Spring Cloud Circuit Breaker (#8819)

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Catalin Burcea 2020-04-09 10:30:04 +03:00 committed by GitHub
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commit 88cc732dc7
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5
spring-cloud/spring-cloud-circuit-breaker/README.md Normal file
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## Spring Cloud Circuit Breaker
This module contains articles about Spring Cloud Circuit Breaker
### Relevant Articles:

55
spring-cloud/spring-cloud-circuit-breaker/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-cloud-circuit-breaker</artifactId>
<name>spring-cloud-gateway</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.spring.cloud</groupId>
<artifactId>spring-cloud</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>..</relativePath>
</parent>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/libs-snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
<releases>
<enabled>false</enabled>
</releases>
</repository>
</repositories>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.2.4.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-circuitbreaker-resilience4j</artifactId>
<version>1.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>

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spring-cloud/spring-cloud-circuit-breaker/src/main/java/com/baeldung/circuitbreaker/AlbumService.java Normal file
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package com.baeldung.circuitbreaker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.circuitbreaker.CircuitBreaker;
import org.springframework.cloud.client.circuitbreaker.CircuitBreakerFactory;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
import java.nio.file.Files;
import java.nio.file.Paths;
@Service
public class AlbumService {
private static final Logger LOGGER = LoggerFactory.getLogger(AlbumService.class);
@Autowired
private CircuitBreakerFactory circuitBreakerFactory;
private RestTemplate restTemplate = new RestTemplate();
public String getAlbumList() {
CircuitBreaker circuitBreaker = circuitBreakerFactory.create("circuitbreaker");
String url = "https://jsonplaceholder.typicode.com/albums";
return circuitBreaker.run(() -> restTemplate.getForObject(url, String.class), throwable -> getDefaultAlbumList());
}
private String getDefaultAlbumList() {
try {
return new String(Files.readAllBytes(Paths.get(getClass().getClassLoader().getResource("fallback-album-list.json").toURI())));
} catch (Exception e) {
LOGGER.error("error occurred while reading the file", e);
}
return null;
}
}

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spring-cloud/spring-cloud-circuit-breaker/src/main/java/com/baeldung/circuitbreaker/Controller.java Normal file
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package com.baeldung.circuitbreaker;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class Controller {
@Autowired
private AlbumService service;
@GetMapping("/albums")
public String albums() {
return service.getAlbumList();
}
}

71
spring-cloud/spring-cloud-circuit-breaker/src/main/java/com/baeldung/circuitbreaker/SpringApp.java Normal file
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package com.baeldung.circuitbreaker;
import io.github.resilience4j.circuitbreaker.CircuitBreakerConfig;
import io.github.resilience4j.timelimiter.TimeLimiterConfig;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.circuitbreaker.resilience4j.Resilience4JCircuitBreakerFactory;
import org.springframework.cloud.circuitbreaker.resilience4j.Resilience4JConfigBuilder;
import org.springframework.cloud.client.circuitbreaker.Customizer;
import org.springframework.context.annotation.Bean;
import java.time.Duration;
@SpringBootApplication
public class SpringApp {
public static void main(String[] args) {
SpringApplication.run(SpringApp.class, args);
}
@Bean
public Customizer<Resilience4JCircuitBreakerFactory> globalCustomConfiguration() {
TimeLimiterConfig timeLimiterConfig = TimeLimiterConfig.custom()
.timeoutDuration(Duration.ofSeconds(4))
.build();
CircuitBreakerConfig circuitBreakerConfig = CircuitBreakerConfig.custom()
.failureRateThreshold(50)
.waitDurationInOpenState(Duration.ofMillis(1000))
.slidingWindowSize(2)
.build();
return factory -> factory.configureDefault(id -> new Resilience4JConfigBuilder(id)
.timeLimiterConfig(timeLimiterConfig)
.circuitBreakerConfig(circuitBreakerConfig)
.build());
}
@Bean
public Customizer<Resilience4JCircuitBreakerFactory> specificCustomConfiguration1() {
TimeLimiterConfig timeLimiterConfig = TimeLimiterConfig.custom()
.timeoutDuration(Duration.ofSeconds(4))
.build();
CircuitBreakerConfig circuitBreakerConfig = CircuitBreakerConfig.custom()
.failureRateThreshold(50)
.waitDurationInOpenState(Duration.ofMillis(1000))
.slidingWindowSize(2)
.build();
return factory -> factory.configure(builder -> builder.circuitBreakerConfig(circuitBreakerConfig)
.timeLimiterConfig(timeLimiterConfig).build(), "circuitBreaker");
}
@Bean
public Customizer<Resilience4JCircuitBreakerFactory> specificCustomConfiguration2() {
TimeLimiterConfig timeLimiterConfig = TimeLimiterConfig.custom()
.timeoutDuration(Duration.ofSeconds(4))
.build();
CircuitBreakerConfig circuitBreakerConfig = CircuitBreakerConfig.custom()
.failureRateThreshold(50)
.waitDurationInOpenState(Duration.ofMillis(1000))
.slidingWindowSize(2)
.build();
return factory -> factory.configure(builder -> builder.circuitBreakerConfig(circuitBreakerConfig)
.timeLimiterConfig(timeLimiterConfig).build(),
"circuitBreaker1", "circuitBreaker2", "circuitBreaker3");
}
}

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spring-cloud/spring-cloud-circuit-breaker/src/main/resources/fallback-album-list.json Normal file
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[
{
"userId": 1,
"id": 1,
"title": "quidem molestiae enim"
},
{
"userId": 1,
"id": 2,
"title": "sunt qui excepturi placeat culpa"
}
]