code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  package org.apache.skywalking.oap.server.receiver.sharing.server;
  
  import io.grpc.BindableService;
  import io.grpc.ServerInterceptor;
  import io.grpc.ServerInterceptors;
  import io.grpc.ServerServiceDefinition;
  import java.util.ArrayList;
  import java.util.List;
  import lombok.Setter;
  import org.apache.skywalking.oap.server.core.server.GRPCHandlerRegister;
  
  public class ReceiverGRPCHandlerRegister implements GRPCHandlerRegister {
  
      @Setter
      private GRPCHandlerRegister grpcHandlerRegister;
      private List<ServerInterceptor> interceptors = new ArrayList<>();
  
      @Override
      public void addHandler(BindableService handler) {
          if (interceptors.isEmpty()) {
              grpcHandlerRegister.addHandler(handler);
          } else {
              interceptors.forEach(interceptor -> {
                  grpcHandlerRegister.addHandler(handlerInterceptorBind(handler, interceptor));
              });
          }
      }
  
      @Override
      public void addHandler(ServerServiceDefinition definition) {
          grpcHandlerRegister.addHandler(definition);
      }
  
      /**
       * If you want to bind @{io.grpc.ServerInterceptor} on a handler, you must call this method before register a
       * handler.
       *
       * @param interceptor of @{io.grpc.ServerInterceptor}
       */
      @Override
      public void addFilter(ServerInterceptor interceptor) {
          this.interceptors.add(interceptor);
      }
  
      private ServerServiceDefinition handlerInterceptorBind(BindableService handler, ServerInterceptor interceptor) {
          return ServerInterceptors.intercept(handler, interceptor);
      }
  }
  