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;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class FrontendSnapshotClient extends RpcClient {
      private static final Logger logger = LoggerFactory.getLogger(FrontendSnapshotClient.class);
  
      public FrontendSnapshotClient(RpcChannel channel) {
          super(channel);
      }
  
      public FrontendSnapshotClient(FrontendSnapshotGrpc.FrontendSnapshotStub stub) {
          super((ManagedChannel) stub.getChannel());
      }
  
      private FrontendSnapshotGrpc.FrontendSnapshotStub getStub() {
          return FrontendSnapshotGrpc.newStub(rpcChannel.getChannel());
      }
  
      public void advanceQuerySnapshot(
              long querySnapshotId, GraphDef graphDef, CompletionCallback<Long> callback) {
          AdvanceQuerySnapshotRequest.Builder builder = AdvanceQuerySnapshotRequest.newBuilder();
          builder.setSnapshotId(querySnapshotId);
          if (graphDef != null) {
              builder.setGraphDef(graphDef.toProto());
          }
          getStub()
                  .advanceQuerySnapshot(
                          builder.build(),
                          new StreamObserver<>() {
                              @Override
                              public void onNext(AdvanceQuerySnapshotResponse response) {
                                  long previousSnapshotId = response.getPreviousSnapshotId();
                                  callback.onCompleted(previousSnapshotId);
                              }
  
                              @Override
                              public void onError(Throwable throwable) {
                                  callback.onError(throwable);
                              }
  
                              @Override
                              public void onCompleted() {}
                          });
      }
  
      public void syncStatistics(Statistics statistics) {
          getStub()
                  .syncStatistics(
                          SyncStatisticsRequest.newBuilder().setStatistics(statistics).build(),
                          new StreamObserver<SyncStatisticsResponse>() {
                              @Override
                              public void onNext(SyncStatisticsResponse value) {}
  
                              @Override
                              public void onError(Throwable t) {
                                  logger.error("Failed sync statistics to frontend", t);
                              }
  
                              @Override
                              public void onCompleted() {}
                          });
      }
  }
  