Merge pull request #192 from KEHFAN/20240709-openFeign

新增openfeign示例代码

Author: JiazhenBao

OpenFeign/README.md

@@ -0,0 +1,55 @@
+<?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>
+
+    <groupId>com.netease.lowcode.extension</groupId>
+    <artifactId>OpenFeign</artifactId>
+    <version>1.0.15</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <!-- 与应用保持一致 -->
+        <spring.boot.version>2.2.9.RELEASE</spring.boot.version>
+    </properties>
+
+    <dependencies>
+        <!-- 导出源码启动时将此依赖手动添加到pom -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-openfeign</artifactId>
+            <version>${spring.boot.version}</version>
+        </dependency>
+
+        <dependency>
+            <artifactId>nasl-metadata-collector</artifactId>
+            <groupId>com.netease.lowcode</groupId>
+            <version>0.8.0</version>
+            <optional>true</optional>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>com.netease.lowcode</groupId>
+                <artifactId>nasl-metadata-maven-plugin</artifactId>
+                <version>1.4.2</version>
+                <configuration>
+                    <jarWithDependencies>false</jarWithDependencies>
+                    <rewriteVersion>false</rewriteVersion>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>archive</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

OpenFeign/pom.xml

@@ -0,0 +1,10 @@
+package com.netease.lowcode.extension;
+
+import com.netease.lowcode.extension.service.UserService;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan(basePackageClasses = {UserService.class})
+public class OpenFeignAutoScan {
+}

OpenFeign/src/main/java/com/netease/lowcode/extension/OpenFeignAutoScan.java

@@ -0,0 +1,14 @@
+package com.netease.lowcode.extension;
+
+import com.netease.lowcode.extension.feign.ExtensionUserClient;
+import org.springframework.cloud.openfeign.EnableFeignClients;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableFeignClients(basePackageClasses = ExtensionUserClient.class)
+public class OpenFeignConfig {
+
+    public OpenFeignConfig() {
+        System.out.println("OpenFeignConfig 扫描成功");
+    }
+}

OpenFeign/src/main/java/com/netease/lowcode/extension/OpenFeignConfig.java

@@ -0,0 +1,21 @@
+package com.netease.lowcode.extension;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.env.EnvironmentPostProcessor;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MapPropertySource;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class OpenFeignEnvironmentPostProcessor implements EnvironmentPostProcessor {
+    @Override
+    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
+        Map<String,Object> config = new HashMap<>();
+        config.put("feign.hystrix.enabled",true);
+        config.put("hystrix.command.default.circuitBreaker.requestVolumeThreshold",2);
+        config.put("hystrix.command.default.circuitBreaker.errorThresholdPercentage",0);
+
+        environment.getPropertySources().addLast(new MapPropertySource("OPENFEIGNMAP",config));
+    }
+}

OpenFeign/src/main/java/com/netease/lowcode/extension/OpenFeignEnvironmentPostProcessor.java

@@ -0,0 +1,11 @@
+package com.netease.lowcode.extension.feign;
+
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@FeignClient(name="extensionUserClient",url = "http://dev.nacos.cstest.lcap.codewave-test.163yun.com")
+public interface ExtensionUserClient {
+
+    @GetMapping("/rest/hello")
+    String hello();
+}

OpenFeign/src/main/java/com/netease/lowcode/extension/feign/ExtensionUserClient.java

@@ -0,0 +1,14 @@
+package com.netease.lowcode.extension.feign;
+
+import com.netease.lowcode.extension.service.ExtensionUserClientFallback;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@FeignClient(name = "extensionUserClientWithFallback",
+        url = "http://dev.nacos.cstest.lcap.codewave-test.163yun.com",
+        fallback = ExtensionUserClientFallback.class)
+public interface ExtensionUserClientWithFallback {
+
+    @GetMapping("/rest/hello")
+    String hello();
+}

OpenFeign/src/main/java/com/netease/lowcode/extension/feign/ExtensionUserClientWithFallback.java

@@ -0,0 +1,13 @@
+package com.netease.lowcode.extension.service;
+
+import com.netease.lowcode.extension.feign.ExtensionUserClientWithFallback;
+import org.springframework.stereotype.Component;
+
+@Component
+public class ExtensionUserClientFallback implements ExtensionUserClientWithFallback {
+
+    @Override
+    public String hello() {
+        return "触发熔断";
+    }
+}

OpenFeign/src/main/java/com/netease/lowcode/extension/service/ExtensionUserClientFallback.java

@@ -0,0 +1,45 @@
+package com.netease.lowcode.extension.service;
+
+import com.netease.lowcode.core.annotation.NaslLogic;
+import com.netease.lowcode.extension.feign.ExtensionUserClient;
+import com.netease.lowcode.extension.feign.ExtensionUserClientWithFallback;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+
+    private static ExtensionUserClient extensionUserClient;
+    private static ExtensionUserClientWithFallback extensionUserClientWithFallback;
+
+    /**
+     * 普通接口调用
+     * 当服务不可用时直接异常
+     *
+     * @return
+     */
+    @NaslLogic
+    public static String hello() {
+        return extensionUserClient.hello();
+    }
+
+    /**
+     * 开启熔断器的接口调用
+     * 当调用服务不可用时将触发熔断降级
+     *
+     * @return
+     */
+    @NaslLogic
+    public static String helloWithFallback() {
+        return extensionUserClientWithFallback.hello();
+    }
+
+    @Autowired
+    public void setUserClient(ExtensionUserClient extensionUserClient) {
+        UserService.extensionUserClient = extensionUserClient;
+    }
+    @Autowired
+    public void setExtensionUserClientWithFallback(ExtensionUserClientWithFallback extensionUserClientWithFallback){
+        UserService.extensionUserClientWithFallback = extensionUserClientWithFallback;
+    }
+}

OpenFeign/src/main/java/com/netease/lowcode/extension/service/UserService.java

@@ -0,0 +1,5 @@
+org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
+    com.netease.lowcode.extension.OpenFeignConfig,\
+    com.netease.lowcode.extension.OpenFeignAutoScan
+org.springframework.boot.env.EnvironmentPostProcessor=\
+    com.netease.lowcode.extension.OpenFeignEnvironmentPostProcessor