Fixes #43 add rules automation

spring-cloud-alibaba-examples/sentinel-example/sentinel-core-example/readme-zh.md

@@ -192,9 +192,9 @@ Sentinel 控制台支持实时监控查看，您可以通过 Sentinel 控制台
 
 <p align="center"><img src="https://cdn.nlark.com/lark/0/2018/png/54319/1532313595369-8428cd7d-9eb7-4786-a149-acf0da4a2daf.png" width="480" heigh='180' ></p>
 
-## DataSource 支持
+## ReadableDataSource 支持
 
-Sentinel 内部提供了[动态规则的扩展实现 DataSource](https://github.com/alibaba/Sentinel/wiki/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%99%E6%89%A9%E5%B1%95#datasource-%E6%89%A9%E5%B1%95)。
+Sentinel 内部提供了[动态规则的扩展实现 ReadableDataSource](https://github.com/alibaba/Sentinel/wiki/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%99%E6%89%A9%E5%B1%95#datasource-%E6%89%A9%E5%B1%95)。
 
 Sentinel starter 整合了目前存在的几类 DataSource。只需要在配置文件中进行相关配置，即可在 Spring 容器中自动注册 DataSource。
 
@@ -210,7 +210,7 @@ Sentinel starter 整合了目前存在的几类 DataSource。只需要在配置
 然后使用`@SentinelDataSource` 注解修饰 DataSource 即可注入：
 
     @SentinelDataSource("spring.cloud.sentinel.datasource")
-    private DataSource dataSource;
+    private ReadableDataSource dataSource;
 
 `@SentinelDataSource` 注解的 value 属性可以不填。默认值就是 `spring.cloud.sentinel.datasource`。
 
@@ -230,7 +230,7 @@ type目前支持file, nacos, zk, apollo。
 
 1. 定义DataSource
   
-        public class CustomDataSource implements DataSource {
+        public class CustomDataSource implements ReadableDataSource {
             private String fieldA;
             private String fieldB;
             ...

spring-cloud-alibaba-examples/sentinel-example/sentinel-core-example/readme.md

@@ -165,9 +165,9 @@ To see the metrics, click **实时监控(Real-time Monitoring)** in the left-sid
 
 <p align="center"><img src="https://cdn.nlark.com/lark/0/2018/png/54319/1532313595369-8428cd7d-9eb7-4786-a149-acf0da4a2daf.png" width="480" heigh='180'></p>
 
-## DataSource
+## ReadableDataSource
 
-Sentinel provide [DataSource](https://github.com/alibaba/Sentinel/blob/master/sentinel-extension/sentinel-datasource-extension/src/main/java/com/alibaba/csp/sentinel/datasource/DataSource.java) to manage dynamic rules.
+Sentinel provide [ReadableDataSource](https://github.com/alibaba/Sentinel/blob/master/sentinel-extension/sentinel-datasource-extension/src/main/java/com/alibaba/csp/sentinel/datasource/ReadableDataSource.java) to manage dynamic rules.
 
 Sentinel starter integrated 4 DataSources provided by Sentinel. It will be register into Spring Context if you write some configs in `application.properties`.
 
@@ -183,7 +183,7 @@ If you want to define FileRefreshableDataSource:
 then use `@SentinelDataSource` to annotate DataSource:
  
     @SentinelDataSource("spring.cloud.sentinel.datasource")
-    private DataSource dataSource;
+    private ReadableDataSource dataSource;
     
 The value() of `@SentinelDataSource` is not required, it means the prefix of configuration. Default value is `spring.cloud.sentinel.datasource`.
 
@@ -201,7 +201,7 @@ User-defined DataSource need 2 steps.
 
 1. Define DataSource
     
-        public class CustomDataSource implements DataSource {
+        public class CustomDataSource implements ReadableDataSource {
             private String fieldA;
             private String fieldB;
             ...

spring-cloud-alibaba-sentinel/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/SentinelDataSourcePostProcessor.java

@@ -36,15 +36,27 @@ import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.beans.factory.support.MergedBeanDefinitionPostProcessor;
 import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.boot.context.event.ApplicationStartedEvent;
 import org.springframework.cloud.alibaba.sentinel.SentinelConstants;
 import org.springframework.cloud.alibaba.sentinel.annotation.SentinelDataSource;
 import org.springframework.cloud.alibaba.sentinel.util.PropertySourcesUtils;
 import org.springframework.context.ApplicationContext;
+import org.springframework.context.event.EventListener;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StringUtils;
 
 import com.alibaba.csp.sentinel.datasource.Converter;
+import com.alibaba.csp.sentinel.datasource.ReadableDataSource;
+import com.alibaba.csp.sentinel.property.SentinelProperty;
+import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRule;
+import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRuleManager;
+import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRule;
+import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRuleManager;
+import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
+import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
+import com.alibaba.csp.sentinel.slots.system.SystemRule;
+import com.alibaba.csp.sentinel.slots.system.SystemRuleManager;
 
 /**
  * {@link SentinelDataSource @SentinelDataSource} Post Processor
@@ -187,7 +199,42 @@ public class SentinelDataSourcePostProcessor
 		beanFactory.registerBeanDefinition(beanName, builder.getBeanDefinition());
 	}
 
-	class SentinelDataSourceField {
+
+	@EventListener(classes = ApplicationStartedEvent.class)
+    public void appStartedListener(ApplicationStartedEvent event) throws Exception {
+	    Map<String, ReadableDataSource> dataSourceMap = event.getApplicationContext().getBeansOfType(ReadableDataSource.class);
+        if(dataSourceMap.size() == 1) {
+            ReadableDataSource dataSource = dataSourceMap.values().iterator().next();
+            Object ruleConfig = dataSource.loadConfig();
+            SentinelProperty sentinelProperty = dataSource.getProperty();
+            if(checkRuleType(ruleConfig, FlowRule.class)) {
+                FlowRuleManager.register2Property(sentinelProperty);
+            }
+            if(checkRuleType(ruleConfig, DegradeRule.class)) {
+                DegradeRuleManager.register2Property(sentinelProperty);
+            }
+            if(checkRuleType(ruleConfig, SystemRule.class)) {
+                SystemRuleManager.register2Property(sentinelProperty);
+            }
+            if(checkRuleType(ruleConfig, AuthorityRule.class)) {
+                AuthorityRuleManager.register2Property(sentinelProperty);
+            }
+        }
+    }
+
+    private boolean checkRuleType(Object ruleConfig, Class type) {
+        if(ruleConfig.getClass() == type) {
+            return true;
+        } else if(ruleConfig instanceof List) {
+            List ruleList = (List)ruleConfig;
+            if(ruleList.stream().filter(rule -> rule.getClass() == type).toArray().length == ruleList.size()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    class SentinelDataSourceField {
 		private SentinelDataSource sentinelDataSource;
 		private Field field;