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GRPC server using near-real-time replication

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/*
 * Copyright 2021 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.doc;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Default implementation of a {@link SharedDocContext}. Uses a {@link ConcurrentHashMap} for thread
 * safety.
 */
public class DefaultSharedDocContext implements SharedDocContext {
  private final Map> contextMap = new ConcurrentHashMap<>();

  @Override
  public Map getContext(int docId) {
    return contextMap.computeIfAbsent(docId, k -> new HashMap<>());
  }
}