content: /**
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * <p>Licensed 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
   *
   * <p>http://www.apache.org/licenses/LICENSE-2.0
   *
   * <p>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 com.alibaba.graphscope.groot.store;
  
  import com.alibaba.graphscope.proto.groot.*;
  
  import io.grpc.stub.StreamObserver;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.Map;
  
  public class StoreSchemaService extends StoreSchemaGrpc.StoreSchemaImplBase {
      private static final Logger logger = LoggerFactory.getLogger(StoreSchemaService.class);
  
      private final StoreService storeService;
  
      public StoreSchemaService(StoreService storeService) {
          this.storeService = storeService;
      }
  
      @Override
      public void fetchSchema(
              FetchSchemaRequest request, StreamObserver<FetchSchemaResponse> responseObserver) {
          logger.debug("received fetch schema request");
          try {
              GraphDefPb graphDefBlob = this.storeService.getGraphDefBlob();
              responseObserver.onNext(
                      FetchSchemaResponse.newBuilder().setGraphDef(graphDefBlob).build());
              responseObserver.onCompleted();
          } catch (IOException e) {
              logger.error("fetch schema failed", e);
              responseObserver.onError(e);
          }
      }
  
      @Override
      public void fetchStatistics(
              FetchStatisticsRequest request,
              StreamObserver<FetchStatisticsResponse> responseObserver) {
          logger.debug("received fetch statistics request");
          try {
              Map<Integer, Statistics> map =
                      this.storeService.getGraphStatisticsBlob(request.getSnapshotId());
              logger.debug("Collected statistics :{}", map.size());
              FetchStatisticsResponse response =
                      FetchStatisticsResponse.newBuilder().putAllStatisticsMap(map).build();
              responseObserver.onNext(response);
              responseObserver.onCompleted();
          } catch (IOException e) {
              logger.error("get statistics failed", e);
              responseObserver.onError(e);
          }
      }
  }
  