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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.composites;
import java.nio.ByteBuffer;
import org.apache.cassandra.schema.ColumnMetadata;
import org.apache.cassandra.cql3.Operator;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.marshal.CollectionType;
import org.apache.cassandra.db.marshal.SetType;
import org.apache.cassandra.db.rows.*;
import org.apache.cassandra.index.internal.CassandraIndex;
import org.apache.cassandra.index.internal.IndexEntry;
import org.apache.cassandra.schema.IndexMetadata;
/**
* Index the value of a collection cell.
*
* This is a lot like an index on REGULAR, except that we also need to make
* the collection key part of the index entry so that:
* 1) we don't have to scan the whole collection at query time to know the
* entry is stale and if it still satisfies the query.
* 2) if a collection has multiple time the same value, we need one entry
* for each so that if we delete one of the value only we only delete the
* entry corresponding to that value.
*/
public class CollectionValueIndex extends CassandraIndex
{
public CollectionValueIndex(ColumnFamilyStore baseCfs, IndexMetadata indexDef)
{
super(baseCfs, indexDef);
}
public ByteBuffer getIndexedValue(ByteBuffer partitionKey,
Clustering clustering,
CellPath path, ByteBuffer cellValue)
{
return cellValue;
}
public CBuilder buildIndexClusteringPrefix(ByteBuffer partitionKey,
ClusteringPrefix prefix,
CellPath path)
{
CBuilder builder = CBuilder.create(getIndexComparator());
builder.add(partitionKey);
for (int i = 0; i < prefix.size(); i++)
builder.add(prefix.get(i), prefix.accessor());
// When indexing a static column, prefix will be empty but only the
// partition key is needed at query time.
// In the non-static case, cell will be present during indexing but
// not when searching (CASSANDRA-7525).
if (prefix.size() == baseCfs.metadata().clusteringColumns().size() && path != null)
builder.add(path.get(0));
return builder;
}
public IndexEntry decodeEntry(DecoratedKey indexedValue, Row indexEntry)
{
Clustering clustering = indexEntry.clustering();
Clustering indexedEntryClustering = null;
if (getIndexedColumn().isStatic())
indexedEntryClustering = Clustering.STATIC_CLUSTERING;
else
{
CBuilder builder = CBuilder.create(baseCfs.getComparator());
for (int i = 0; i < baseCfs.getComparator().size(); i++)
builder.add(clustering, i + 1);
indexedEntryClustering = builder.build();
}
return new IndexEntry(indexedValue,
clustering,
indexEntry.primaryKeyLivenessInfo().timestamp(),
clustering.bufferAt(0),
indexedEntryClustering);
}
public boolean supportsOperator(ColumnMetadata indexedColumn, Operator operator)
{
return operator == Operator.CONTAINS && !(indexedColumn.type instanceof SetType);
}
public boolean isStale(Row data, ByteBuffer indexValue, long nowInSec)
{
ColumnMetadata columnDef = indexedColumn;
ComplexColumnData complexData = data.getComplexColumnData(columnDef);
if (complexData == null)
return true;
for (Cell cell : complexData)
{
if (cell.isLive(nowInSec) && ((CollectionType) columnDef.type).valueComparator()
.compare(indexValue, cell.buffer()) == 0)
return false;
}
return true;
}
}