4.0.3

doc/docs/files/90011_原理分析之如何存储路由.md

@@ -15,14 +15,9 @@ this.publisher.publishEvent(new HeartbeatEvent(this, this.nacosWatchIndex.getAnd
 
 ```java
 public class AbstractConfiguration implements ApplicationContextAware, ApplicationListener<HeartbeatEvent> {
-        /**
-         * nacos事件监听，每次微服务变化会触发这个方法
-         * @see org.springframework.cloud.alibaba.nacos.discovery.NacosWatch NacosWatch
-         * @param heartbeatEvent
-         */
-        @Override
-        public void onApplicationEvent(HeartbeatEvent heartbeatEvent) {
-            ...这里加载路由信息
+        @EventListener(classes = HeartbeatEvent.class)
+        public void listenEvent(ApplicationEvent heartbeatEvent) {
+            // 有服务注册进来
         }
 }
 ```
@@ -32,23 +27,26 @@ public class AbstractConfiguration implements ApplicationContextAware, Applicati
 加载路由伪代码如下：
 
 ```java
-public void onApplicationEvent(HeartbeatEvent heartbeatEvent) {
-    // 获取nacos中的服务实例列表
-    List<Instance> allInstances = namingService.getAllInstances(serviceName);
-    for(Instance instance : allInstances) {
-        // 微服务提供的接口
-        String url = "http://" + instance.getIp + ":" + instance.getPort + "/sop/routes";
-        ResponseEntity<String> responseEntity = restTemplate.getForEntity(url, String.class);
-        if (responseEntity.getStatusCode() == HttpStatus.OK) {
-            // 返回来的路由信息
-            String body = responseEntity.getBody();
-            ...加载路由到本地
-        }
+@Override
+public void onAddInstance(InstanceDefinition instance) {
+    String serviceName = instance.getServiceId();
+    String url = getRouteRequestUrl(instance);
+    log.info("拉取路由配置，serviceId: {}, url: {}", serviceName, url);
+    ResponseEntity<String> responseEntity = getRestTemplate().getForEntity(url, String.class);
+    if (responseEntity.getStatusCode() == HttpStatus.OK) {
+        String body = responseEntity.getBody();
+        ServiceRouteInfo serviceRouteInfo = JSON.parseObject(body, ServiceRouteInfo.class);
+        baseRouteCache.load(serviceRouteInfo, callback -> routesProcessor.saveRoutes(serviceRouteInfo, instance));
+    } else {
+        log.error("拉取路由配置异常，url: {}, status: {}, body: {}", url, responseEntity.getStatusCodeValue(), responseEntity.getBody());
     }
 }
 ```
 
-完整代码可参看`com.gitee.sop.gatewaycommon.manager.ServiceRoutesLoader.java`
+参考代码：
+
+- `com.gitee.sop.gatewaycommon.route.RegistryListener`以及实现类
+- `com.gitee.sop.gatewaycommon.route.ServiceRouteListener`
 
 路由的存储方式是一个Map，key为路由id，即接口名+版本号。
 
@@ -56,7 +54,7 @@ public void onApplicationEvent(HeartbeatEvent heartbeatEvent) {
 /**
  * key：nameVersion
  */
-private Map<String, ZuulTargetRoute> nameVersionTargetRouteMap;
+private static final Map<String, GatewayTargetRoute> routes = synchronizedMap(new LinkedHashMap<>());
 ```
 
 因为客户端调用接口都会传递一个接口名和版本号，因此通过这两个字段能够很快查询出路由信息，进行路由转发操作。