AbstractPartitionedRepositoryManager.java example

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 org.apache.geode.cache.lucene.internal;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.geode.InternalGemFireError;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.execute.RegionFunctionContext;
import org.apache.geode.cache.lucene.internal.repository.IndexRepository;
import org.apache.geode.cache.lucene.internal.repository.RepositoryManager;
import org.apache.geode.cache.lucene.internal.repository.serializer.LuceneSerializer;
import org.apache.geode.internal.cache.BucketNotFoundException;
import org.apache.geode.internal.cache.BucketRegion;
import org.apache.geode.internal.cache.PartitionedRegion;
import org.apache.geode.internal.cache.execute.InternalRegionFunctionContext;

public abstract class AbstractPartitionedRepositoryManager implements RepositoryManager {

  /**
   * map of the parent bucket region to the index repository
   * 
   * This is based on the BucketRegion in case a bucket is rebalanced, we don't want to return a
   * stale index repository. If a bucket moves off of this node and comes back, it will have a new
   * BucketRegion object.
   * 
   * It is weak so that the old BucketRegion will be garbage collected.
   */
  protected final ConcurrentHashMap<Integer, IndexRepository> indexRepositories =
      new ConcurrentHashMap<Integer, IndexRepository>();

  /** The user region for this index */
  protected final PartitionedRegion userRegion;
  protected final LuceneSerializer serializer;
  protected final LuceneIndexImpl index;

  public AbstractPartitionedRepositoryManager(LuceneIndexImpl index, LuceneSerializer serializer) {
    this.index = index;
    this.userRegion = (PartitionedRegion) index.getCache().getRegion(index.getRegionPath());
    this.serializer = serializer;
  }

  @Override
  public IndexRepository getRepository(Region region, Object key, Object callbackArg)
      throws BucketNotFoundException {
    BucketRegion userBucket = userRegion.getBucketRegion(key, callbackArg);
    if (userBucket == null) {
      throw new BucketNotFoundException("User bucket was not found for region " + region + "key "
          + key + " callbackarg " + callbackArg);
    }

    return getRepository(userBucket.getId());
  }

  @Override
  public Collection<IndexRepository> getRepositories(RegionFunctionContext ctx)
      throws BucketNotFoundException {
    Region<Object, Object> region = ctx.getDataSet();
    Set<Integer> buckets = ((InternalRegionFunctionContext) ctx).getLocalBucketSet(region);
    ArrayList<IndexRepository> repos = new ArrayList<IndexRepository>(buckets.size());
    for (Integer bucketId : buckets) {
      BucketRegion userBucket = userRegion.getDataStore().getLocalBucketById(bucketId);
      if (userBucket == null) {
        throw new BucketNotFoundException(
            "User bucket was not found for region " + region + "bucket id " + bucketId);
      } else {
        repos.add(getRepository(userBucket.getId()));
      }
    }

    return repos;
  }

  public abstract IndexRepository createOneIndexRepository(final Integer bucketId,
      LuceneSerializer serializer, LuceneIndexImpl index, PartitionedRegion userRegion)
      throws IOException;

  /**
   * Return the repository for a given user bucket
   */
  protected IndexRepository getRepository(Integer bucketId) throws BucketNotFoundException {
    IndexRepository repo = indexRepositories.get(bucketId);
    if (repo != null && !repo.isClosed()) {
      return repo;
    }

    repo = indexRepositories.compute(bucketId, (key, oldRepository) -> {
      if (oldRepository != null && !oldRepository.isClosed()) {
        return oldRepository;
      }
      if (oldRepository != null) {
        oldRepository.cleanup();
      }

      try {
        return createOneIndexRepository(bucketId, serializer, index, userRegion);
      } catch (IOException e) {
        throw new InternalGemFireError("Unable to create index repository", e);
      }

    });

    if (repo == null) {
      throw new BucketNotFoundException(
          "Colocated index buckets not found for bucket id " + bucketId);
    }

    return repo;
  }
}