code: package io.ray.serve.proxy;
  
  import io.ray.serve.api.Serve;
  import io.ray.serve.generated.EndpointInfo;
  import io.ray.serve.handle.RayServeHandle;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  import org.apache.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /** Default common router for proxy to match incomming routes. */
  public class ProxyRouter {
  
    private static final Logger LOGGER = LoggerFactory.getLogger(ProxyRouter.class);
  
    /** Key: route, value: endpoint. */
    private Map<String, EndpointInfo> routeInfo = new HashMap<>();
  
    /** Key: endpointName, value: handle. */
    private Map<String, RayServeHandle> handles = new ConcurrentHashMap<>();
  
    public void updateRoutes(Map<String, EndpointInfo> endpoints) {
      LOGGER.info("Got updated endpoints: {}.", endpoints);
  
      Set<String> existingHandles = new HashSet<>(handles.keySet());
      Map<String, EndpointInfo> routeInfo = new HashMap<>();
  
      if (endpoints != null) {
        for (Map.Entry<String, EndpointInfo> entry : endpoints.entrySet()) {
          String route =
              StringUtils.isNotBlank(entry.getValue().getRoute())
                  ? entry.getValue().getRoute()
                  : entry.getKey();
          routeInfo.put(route, entry.getValue());
  
          if (handles.containsKey(entry.getKey())) {
            existingHandles.remove(entry.getKey());
          } else {
            handles.put(entry.getKey(), Serve.getGlobalClient().getHandle(entry.getKey(), true));
          }
        }
      }
  
      this.routeInfo = routeInfo;
      for (String endpoint : existingHandles) {
        handles.remove(endpoint);
      }
      LOGGER.info("The final route info: {}.", routeInfo);
    }
  
    /**
     * Return the longest prefix match among existing routes for the route.
     *
     * @param route route to match against.
     * @return serve_handle (RayServeHandle) if found, else null.
     */
    public RayServeHandle matchRoute(String route) {
      EndpointInfo endpointInfo = routeInfo.get(route);
      return endpointInfo == null ? null : handles.get(endpointInfo.getEndpointName());
    }
  
    public Map<String, EndpointInfo> getRouteInfo() {
      return routeInfo;
    }
  
    public Map<String, RayServeHandle> getHandles() {
      return handles;
    }
  }
  