content: /*
   * 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.cassandra.index.internal;
  
  import java.util.Collection;
  import java.util.Set;
  
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.db.RegularAndStaticColumns;
  import org.apache.cassandra.db.compaction.CompactionInfo;
  import org.apache.cassandra.db.compaction.CompactionInterruptedException;
  import org.apache.cassandra.db.compaction.OperationType;
  import org.apache.cassandra.index.Index;
  import org.apache.cassandra.index.SecondaryIndexBuilder;
  import org.apache.cassandra.io.sstable.ReducingKeyIterator;
  import org.apache.cassandra.io.sstable.format.SSTableReader;
  import org.apache.cassandra.schema.ColumnMetadata;
  import org.apache.cassandra.utils.TimeUUID;
  
  import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUID;
  
  /**
   * Manages building an entire index from column family data. Runs on to compaction manager.
   */
  public class CollatedViewIndexBuilder extends SecondaryIndexBuilder
  {
      private final ColumnFamilyStore cfs;
      private final Set<Index> indexers;
      private final ReducingKeyIterator iter;
      private final TimeUUID compactionId;
      private final Collection<SSTableReader> sstables;
  
      public CollatedViewIndexBuilder(ColumnFamilyStore cfs, Set<Index> indexers, ReducingKeyIterator iter, Collection<SSTableReader> sstables)
      {
          this.cfs = cfs;
          this.indexers = indexers;
          this.iter = iter;
          this.compactionId = nextTimeUUID();
          this.sstables = sstables;
      }
  
      public CompactionInfo getCompactionInfo()
      {
          return new CompactionInfo(cfs.metadata(),
                                    OperationType.INDEX_BUILD,
                                    iter.getBytesRead(),
                                    iter.getTotalBytes(),
                                    compactionId,
                                    sstables);
      }
  
      public void build()
      {
          try
          {
              int pageSize = cfs.indexManager.calculateIndexingPageSize();
              RegularAndStaticColumns targetPartitionColumns = extractIndexedColumns();
              
              while (iter.hasNext())
              {
                  if (isStopRequested())
                      throw new CompactionInterruptedException(getCompactionInfo());
                  DecoratedKey key = iter.next();
                  cfs.indexManager.indexPartition(key, indexers, pageSize, targetPartitionColumns);
              }
          }
          finally
          {
              iter.close();
          }
      }
  
      private RegularAndStaticColumns extractIndexedColumns()
      {
          RegularAndStaticColumns.Builder builder = RegularAndStaticColumns.builder();
          
          for (Index index : indexers)
          {
              boolean isPartitionIndex = true;
              
              for (ColumnMetadata column : cfs.metadata().regularAndStaticColumns())
              {
                  if (index.dependsOn(column))
                  {
                      builder.add(column);
                      isPartitionIndex = false;
                  }
              }
  
              // if any index declares no dependency on any column, it is a full partition index
              // so we can use the base partition columns as the input source
              if (isPartitionIndex)
                  return cfs.metadata().regularAndStaticColumns();
          }
          
          return builder.build();
      }
  }
  