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.coordinator;
  
  import com.alibaba.graphscope.groot.CompletionCallback;
  import com.alibaba.graphscope.groot.common.schema.wrapper.GraphDef;
  import com.alibaba.graphscope.groot.rpc.RpcChannel;
  import com.alibaba.graphscope.groot.rpc.RpcClient;
  import com.alibaba.graphscope.proto.groot.*;
  
  import io.grpc.ManagedChannel;
  import io.grpc.stub.StreamObserver;
  
  public class StoreSchemaClient extends RpcClient {
      public StoreSchemaClient(RpcChannel channel) {
          super(channel);
      }
  
      public StoreSchemaClient(StoreSchemaGrpc.StoreSchemaBlockingStub stub) {
          super((ManagedChannel) stub.getChannel());
      }
  
      private StoreSchemaGrpc.StoreSchemaBlockingStub getStub() {
          return StoreSchemaGrpc.newBlockingStub(rpcChannel.getChannel());
      }
  
      private StoreSchemaGrpc.StoreSchemaStub getAsyncStub() {
          return StoreSchemaGrpc.newStub(rpcChannel.getChannel());
      }
  
      public GraphDef fetchSchema() {
          StoreSchemaGrpc.StoreSchemaBlockingStub stub = getStub();
          FetchSchemaResponse response = stub.fetchSchema(FetchSchemaRequest.newBuilder().build());
          return GraphDef.parseProto(response.getGraphDef());
      }
  
      public void fetchStatistics(CompletionCallback<FetchStatisticsResponse> callback) {
          long snapshotId = Long.MAX_VALUE - 1;
          FetchStatisticsRequest request =
                  FetchStatisticsRequest.newBuilder().setSnapshotId(snapshotId).build();
          getAsyncStub()
                  .fetchStatistics(
                          request,
                          new StreamObserver<>() {
                              @Override
                              public void onNext(FetchStatisticsResponse value) {
                                  callback.onCompleted(value);
                              }
  
                              @Override
                              public void onError(Throwable t) {
                                  callback.onError(t);
                              }
  
                              @Override
                              public void onCompleted() {}
                          });
      }
  }
  