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GRPC lucene server using near-real-time replication

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/*
 * Copyright 2024 Yelp Inc.
 *
 * 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
 *
 *     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 com.yelp.nrtsearch.server.handler;

import com.yelp.nrtsearch.server.grpc.GetAllSnapshotGenRequest;
import com.yelp.nrtsearch.server.grpc.GetAllSnapshotGenResponse;
import com.yelp.nrtsearch.server.state.GlobalState;
import io.grpc.stub.StreamObserver;
import java.io.IOException;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class GetAllSnapshotIndexGenHandler
    extends Handler {
  private static final Logger logger = LoggerFactory.getLogger(GetAllSnapshotIndexGenHandler.class);

  public GetAllSnapshotIndexGenHandler(GlobalState globalState) {
    super(globalState);
  }

  @Override
  public void handle(
      GetAllSnapshotGenRequest request,
      StreamObserver responseObserver) {
    try {
      Set snapshotGens =
          getGlobalState()
              .getIndex(request.getIndexName())
              .getShard(0)
              .snapshotGenToVersion
              .keySet();
      GetAllSnapshotGenResponse response =
          GetAllSnapshotGenResponse.newBuilder().addAllIndexGens(snapshotGens).build();
      responseObserver.onNext(response);
      responseObserver.onCompleted();
    } catch (IOException e) {
      logger.error(
          "Error getting all snapshotted index gens for index: {}", request.getIndexName(), e);
      responseObserver.onError(e);
    }
  }
}