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.envoy;
  
  import com.google.protobuf.Struct;
  import org.apache.skywalking.oap.server.receiver.envoy.als.ServiceMetaInfo;
  
  /**
   * Factory to create {@link ServiceMetaInfo} instances from Kubernetes Pods, Envoy access log metadata, etc.
   */
  public interface ServiceMetaInfoFactory {
      /**
       * @return the {@link Class} of the {@link ServiceMetaInfo} implementation.
       */
      Class<? extends ServiceMetaInfo> clazz();
  
      /**
       * @return an UNKNOWN instance of {@link ServiceMetaInfo}.
       */
      ServiceMetaInfo unknown();
  
      /**
       * Create an instance of {@link ServiceMetaInfo} from the given {@link Struct protobuf struct}.
       */
      ServiceMetaInfo fromStruct(final Struct struct) throws Exception;
  }
  