added circuit-breaker example

demo-circuit-breaker/.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

demo-circuit-breaker/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         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>
+  <parent>
+    <groupId>com.xkcoding</groupId>
+    <artifactId>spring-boot-demo</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>demo-circuit-breaker</artifactId>
+
+  <properties>
+    <maven.compiler.source>17</maven.compiler.source>
+    <maven.compiler.target>17</maven.compiler.target>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+  <dependencies>
+    <dependency>
+      <groupId>io.github.resilience4j</groupId>
+      <artifactId>resilience4j-spring-boot2</artifactId>
+      <version>1.7.0</version>
+    </dependency>
+  </dependencies>
+
+</project>

demo-circuit-breaker/src/main/java/PaymentCircuitBreaker.java

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+import io.github.resilience4j.circuitbreaker.annotation.CircuitBreaker;
+
+import java.io.IOException;
+import java.net.*;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+public class PaymentCircuitBreaker {
+  PaymentService service = new PaymentService();
+
+  @CircuitBreaker(name = "updateOrder", fallbackMethod = "paymentAuthorizedPendingIntegration")
+  public void paymentConfirm() throws IOException, InterruptedException {
+
+    HttpClient client = HttpClient.newHttpClient();
+    HttpRequest request = HttpRequest.newBuilder()
+      .uri(URI.create("http://example.com/payment-confirm"))
+      .build();
+
+    HttpResponse<String> response = client.send(request,
+      HttpResponse.BodyHandlers.ofString());
+
+    service.paymentConfirm(response);
+
+
+  }
+
+  public void paymentAuthorizedPendingIntegration(Long id, Exception e) {
+    service.updateStatus();
+  }
+}

demo-circuit-breaker/src/main/java/PaymentService.java

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+import java.net.http.HttpResponse;
+
+public class PaymentService {
+  public void paymentConfirm(HttpResponse<String> confirms) {
+
+  }
+
+  public void updateStatus() {
+
+  }
+}