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Data layer indexing framework.
There is a newer version: 8.4.5
package org.molgenis.data.index;

import static com.google.common.collect.ImmutableSet.toImmutableSet;
import static com.google.common.collect.Sets.union;
import static java.util.stream.Collectors.partitioningBy;

import com.google.common.base.Stopwatch;
import com.google.common.collect.ImmutableSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

/** Determines the impact of changes. */
@Component
public class IndexingStrategy {
  private static final Logger LOG = LoggerFactory.getLogger(IndexingStrategy.class);

  /**
   * Determines which {@link Impact}s follow from a set of changes.
   *
   * @param changes The {@link Impact}s of which the impact needs to be determined
   * @param dependencyModel {@link IndexDependencyModel} to determine which entities depend on which
   *     entities
   * @return Set containing the impact of the changes
   */
  Set determineImpact(Set changes, IndexDependencyModel dependencyModel) {
    Stopwatch sw = Stopwatch.createStarted();
    Map> split =
        changes.stream().collect(partitioningBy(Impact::isWholeRepository));
    ImmutableSet allEntityTypeIds =
        changes.stream().map(Impact::getEntityTypeId).collect(toImmutableSet());
    Set dependentEntities =
        allEntityTypeIds.stream()
            .flatMap(dependencyModel::getEntityTypesDependentOn)
            .collect(toImmutableSet());
    Set result = collectResult(split.get(false), split.get(true), dependentEntities);
    if (LOG.isDebugEnabled()) {
      LOG.debug("Determined {} necessary actions in {}", result.size(), sw);
    }
    return result;
  }

  /**
   * Combines the results.
   *
   * @param singleEntityChanges {@link Impact}s for changes made to specific Entity instances
   * @param wholeRepoActions {@link Impact}s for changes made to entire repositories
   * @param dependentEntityIds {@link Impact}s for entitytypes that are dependent on one or more of
   *     the changes
   * @return Set with the {@link Impact}s
   */
  private Set collectResult(
      List singleEntityChanges,
      List wholeRepoActions,
      Set dependentEntityIds) {
    Set wholeRepoIds =
        union(
            wholeRepoActions.stream().map(Impact::getEntityTypeId).collect(toImmutableSet()),
            dependentEntityIds);

    ImmutableSet.Builder result = ImmutableSet.builder();
    result.addAll(wholeRepoActions);
    dependentEntityIds.stream().map(Impact::createWholeRepositoryImpact).forEach(result::add);
    singleEntityChanges.stream()
        .filter(action -> !wholeRepoIds.contains(action.getEntityTypeId()))
        .forEach(result::add);
    return result.build();
  }
}