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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
   * <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 org.apache.atlas.repository.patches;
  
  import org.apache.atlas.exception.AtlasBaseException;
  import org.apache.atlas.model.instance.AtlasEntity;
  import org.apache.atlas.pc.WorkItemManager;
  import org.apache.atlas.repository.Constants;
  import org.apache.atlas.repository.graphdb.AtlasEdge;
  import org.apache.atlas.repository.graphdb.AtlasEdgeDirection;
  import org.apache.atlas.repository.graphdb.AtlasGraph;
  import org.apache.atlas.repository.graphdb.AtlasVertex;
  import org.apache.atlas.repository.store.graph.v2.AtlasGraphUtilsV2;
  import org.apache.atlas.type.AtlasClassificationType;
  import org.apache.atlas.type.AtlasEntityType;
  import org.apache.atlas.type.AtlasTypeRegistry;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.HashSet;
  import java.util.Set;
  
  import static org.apache.atlas.model.patches.AtlasPatch.PatchStatus.APPLIED;
  
  public class ClassificationTextPatch extends AtlasPatchHandler {
      private static final Logger LOG = LoggerFactory.getLogger(ClassificationTextPatch.class);
  
      private static final String PATCH_ID          = "JAVA_PATCH_0000_002";
      private static final String PATCH_DESCRIPTION = "Populates Classification Text attribute for entities from classifications applied on them.";
  
      private final PatchContext context;
  
      public ClassificationTextPatch(PatchContext context) {
          super(context.getPatchRegistry(), PATCH_ID, PATCH_DESCRIPTION);
  
          this.context = context;
      }
  
      @Override
      public void apply() throws AtlasBaseException {
          ConcurrentPatchProcessor patchProcessor = new ClassificationTextPatchProcessor(context);
  
          patchProcessor.apply();
  
          setStatus(APPLIED);
  
          LOG.info("ClassificationTextPatch.apply(): patchId={}, status={}", getPatchId(), getStatus());
      }
  
      public static class ClassificationTextPatchProcessor extends ConcurrentPatchProcessor {
          public ClassificationTextPatchProcessor(PatchContext context) {
              super(context);
          }
  
          @Override
          protected void prepareForExecution() {
              //do nothing
          }
  
          @Override
          public void submitVerticesToUpdate(WorkItemManager manager) {
              AtlasTypeRegistry typeRegistry = getTypeRegistry();
              AtlasGraph        graph        = getGraph();
              Set<Long>         vertexIds    = new HashSet<>();
  
              for (AtlasClassificationType classificationType : typeRegistry.getAllClassificationTypes()) {
                  LOG.info("finding classification of type {}", classificationType.getTypeName());
  
                  Iterable<AtlasVertex> iterable = graph.query().has(Constants.ENTITY_TYPE_PROPERTY_KEY, classificationType.getTypeName()).vertices();
                  int                   count    = 0;
  
                  for (AtlasVertex classificationVertex : iterable) {
                      Iterable<AtlasEdge> edges = classificationVertex.getEdges(AtlasEdgeDirection.IN);
  
                      for (AtlasEdge edge : edges) {
                          AtlasVertex entityVertex = edge.getOutVertex();
                          Long        vertexId     = (Long) entityVertex.getId();
  
                          if (vertexIds.contains(vertexId)) {
                              continue;
                          }
  
                          vertexIds.add(vertexId);
  
                          manager.checkProduce(vertexId);
                      }
  
                      count++;
                  }
  
                  LOG.info("found {} classification of type {}", count, classificationType.getTypeName());
              }
  
              LOG.info("found {} entities with classifications", vertexIds.size());
          }
  
          @Override
          protected void processVertexItem(Long vertexId, AtlasVertex vertex, String typeName, AtlasEntityType entityType) throws AtlasBaseException {
              processItem(vertexId, vertex, typeName, entityType);
          }
  
          private void processItem(Long vertexId, AtlasVertex vertex, String typeName, AtlasEntityType entityType) throws AtlasBaseException {
              LOG.debug("processItem(typeName={}, vertexId={})", typeName, vertexId);
  
              if (AtlasGraphUtilsV2.getState(vertex) != AtlasEntity.Status.ACTIVE) {
                  return;
              }
  
              getEntityGraphMapper().updateClassificationTextAndNames(vertex);
  
              LOG.debug("processItem(typeName={}, vertexId={}): Done!", typeName, vertexId);
          }
      }
  }
  