初始化 spring cloud 项目的 system 和 infra 模块

yudao-framework/yudao-spring-boot-starter-extension/src/main/java/cn/iocoder/yudao/framework/extension/core/factory/ExtensionRegisterFactory.java

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+package cn.iocoder.yudao.framework.extension.core.factory;
+
+import cn.iocoder.yudao.framework.extension.core.BusinessScenario;
+import cn.iocoder.yudao.framework.extension.core.point.ExtensionPoint;
+import cn.iocoder.yudao.framework.extension.core.stereotype.Extension;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.aop.support.AopUtils;
+import org.springframework.context.ApplicationContext;
+import org.springframework.core.annotation.AnnotationUtils;
+import org.springframework.stereotype.Component;
+import org.springframework.util.ClassUtils;
+
+import javax.validation.constraints.NotNull;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * @description 注册工厂
+ * @author Qingchen
+ * @version 1.0.0
+ * @date 2021-08-28 23:07
+ * @class cn.iocoder.yudao.framework.extension.core.factory.ExtensionRegisterFactory.java
+ */
+@Component
+@Slf4j
+public class ExtensionRegisterFactory implements ExtensionFactory {
+
+    /**
+     * spring ApplicationContext
+     */
+    private ApplicationContext applicationContext;
+
+    /**
+     * 扩展点实现类集合
+     */
+    private Map<String, ExtensionDefinition> registerExtensionBeans = new ConcurrentHashMap<>();
+
+    @Override
+    public void register(String basePackage) {
+        final Map<String, Object> beans = applicationContext.getBeansWithAnnotation(Extension.class);
+        if(beans == null || beans.isEmpty()) {
+            return;
+        }
+
+        beans.values().forEach(point -> doRegister((ExtensionPoint) point));
+        log.info("业务场景相关扩展点注册完成，注册数量: {}", registerExtensionBeans.size());
+    }
+
+    @Override
+    public <T extends ExtensionPoint> T get(BusinessScenario businessScenario, Class<T> clazz) {
+
+        final ExtensionDefinition definition = registerExtensionBeans.get(businessScenario.getUniqueIdentity());
+        if(definition == null) {
+            log.error("获取业务场景扩展点实现失败，失败原因：尚未定义该业务场景相关扩展点。{}", businessScenario);
+            throw new RuntimeException("尚未定义该业务场景相关扩展点 [" + businessScenario + "]");
+        }
+
+        return (T) definition.getExtensionPoint();
+    }
+
+    /**
+     * 注册扩展点
+     * @param point
+     */
+    private void doRegister(@NotNull ExtensionPoint point) {
+        Class<?>  extensionClazz = point.getClass();
+
+        if (AopUtils.isAopProxy(point)) {
+            extensionClazz = ClassUtils.getUserClass(point);
+        }
+
+        Extension extension = AnnotationUtils.findAnnotation(extensionClazz, Extension.class);
+        final BusinessScenario businessScenario = BusinessScenario.valueOf(extension.businessId(), extension.useCase(), extension.scenario());
+        final ExtensionDefinition definition = ExtensionDefinition.valueOf(businessScenario, point);
+        final ExtensionDefinition exist = registerExtensionBeans.get(businessScenario.getUniqueIdentity());
+        if(exist != null && !exist.equals(definition)) {
+            throw new RuntimeException("相同的业务场景重复注册了不同类型的扩展点实现 :【" + definition + "】【" + exist + "】");
+        }
+
+        registerExtensionBeans.put(businessScenario.getUniqueIdentity(), definition);
+    }
+
+    public void setApplicationContext(ApplicationContext applicationContext) {
+        this.applicationContext = applicationContext;
+    }
+}

yudao-framework/yudao-spring-boot-starter-extension/src/main/java/cn/iocoder/yudao/framework/extension/core/stereotype/Extension.java

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+package cn.iocoder.yudao.framework.extension.core.stereotype;
+
+import cn.iocoder.yudao.framework.extension.core.BusinessScenario;
+import org.springframework.stereotype.Component;
+
+import java.lang.annotation.*;
+
+/**
+ * @description 表示带注释的类是“扩展组件”
+ * @author Qingchen
+ * @version 1.0.0
+ * @date 2021-08-28 21:59
+ * @class cn.iocoder.yudao.framework.extension.core.stereotype.Extension.java
+ */
+@Inherited
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE})
+@Component
+public @interface Extension {
+
+    /**
+     * 业务 <br/>
+     * 一个自负盈亏的财务主体，比如tmall、淘宝和零售通就是三个不同的业务
+     * @return
+     */
+    String businessId() default BusinessScenario.DEFAULT_BUSINESS_ID;
+
+    /**
+     * 用例 <br/>
+     * 描述了用户和系统之间的互动，每个用例提供了一个或多个场景。比如，支付订单就是一个典型的用例。
+     * @return
+     */
+    String useCase() default BusinessScenario.DEFAULT_USECASE;
+
+    /**
+     * 场景 <br/>
+     * 场景也被称为用例的实例（Instance），包括用例所有的可能情况（正常的和异常的）。比如对于"订单支付"这个用例，就有“支付宝支付”、“银行卡支付”、"微信支付"等多个场景
+     * @return
+     */
+    String scenario() default BusinessScenario.DEFAULT_SCENARIO;
+}