springmvc register过程

福建SEO：首先在AbstractHandlerMethodMapping中，在afterPropertiesSet这个钩子函数中，先初始化handlerMethods。

在detectHandlerMethods中，获取如下map

// key值为method value为 RequestMappingInfo 这个类标明了该方法的条件 包括url以及http方法等等信息
Map<Method, T> methods = MethodIntrospector.selectMethods(userType,
      (MethodIntrospector.MetadataLookup<T>) method -> {
         try {
            return getMappingForMethod(method, userType);
         }
         catch (Throwable ex) {
            throw new IllegalStateException("Invalid mapping on handler class [" +
                  userType.getName() + "]: " + method, ex);
         }
      });

注册的过程在方法中进行

// mapping 的信息  handler为该方法的bean的name method为方法
public void register(T mapping, Object handler, Method method) {
   // Assert that the handler method is not a suspending one.
   if (KotlinDetector.isKotlinType(method.getDeclaringClass()) && KotlinDelegate.isSuspend(method)) {
      throw new IllegalStateException("Unsupported suspending handler method detected: " + method);
   }
    // 先获取写锁
   this.readWriteLock.writeLock().lock();
   try {
      HandlerMethod handlerMethod = createHandlerMethod(handler, method);
      validateMethodMapping(handlerMethod, mapping);
      this.mappingLookup.put(mapping, handlerMethod);

      List<String> directUrls = getDirectUrls(mapping);
      for (String url : directUrls) {
         this.urlLookup.add(url, mapping);
      }

      String name = null;
      if (getNamingStrategy() != null) {
         name = getNamingStrategy().getName(handlerMethod, mapping);
         addMappingName(name, handlerMethod);
      }

      CorsConfiguration corsConfig = initCorsConfiguration(handler, method, mapping);
      if (corsConfig != null) {
         this.corsLookup.put(handlerMethod, corsConfig);
      }

      this.registry.put(mapping, new MappingRegistration<>(mapping, handlerMethod, directUrls, name));
   }
   finally {
      this.readWriteLock.writeLock().unlock();
   }
}