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Palantir open source project

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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.cassandra.db.index;

import java.io.IOException;
import java.util.Set;
import java.util.UUID;

import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.db.compaction.CompactionInfo;
import org.apache.cassandra.db.compaction.OperationType;
import org.apache.cassandra.db.compaction.CompactionInterruptedException;
import org.apache.cassandra.io.sstable.ReducingKeyIterator;
import org.apache.cassandra.utils.UUIDGen;

/**
 * Manages building an entire index from column family data. Runs on to compaction manager.
 */
public class SecondaryIndexBuilder extends CompactionInfo.Holder
{
    private final ColumnFamilyStore cfs;
    private final Set idxNames;
    private final ReducingKeyIterator iter;
    private final UUID compactionId;

    public SecondaryIndexBuilder(ColumnFamilyStore cfs, Set idxNames, ReducingKeyIterator iter)
    {
        this.cfs = cfs;
        this.idxNames = idxNames;
        this.iter = iter;
        compactionId = UUIDGen.getTimeUUID();
    }

    public CompactionInfo getCompactionInfo()
    {
        return new CompactionInfo(cfs.metadata,
                                  OperationType.INDEX_BUILD,
                                  iter.getBytesRead(),
                                  iter.getTotalBytes(),
                                  compactionId);
    }

    public void build()
    {
        while (iter.hasNext())
        {
            if (isStopRequested())
                throw new CompactionInterruptedException(getCompactionInfo());
            DecoratedKey key = iter.next();
            Keyspace.indexRow(key, cfs, idxNames);
        }

        try
        {
            iter.close();
        }
        catch (IOException e)
        {
            throw new RuntimeException(e);
        }
    }
}