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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.sai.disk.v1.vector;
import org.jctools.maps.NonBlockingHashMapLong;
public class ConcurrentVectorValues implements RamAwareVectorValues
{
private final int dimensions;
private final NonBlockingHashMapLong values = new NonBlockingHashMapLong<>();
public ConcurrentVectorValues(int dimensions)
{
this.dimensions = dimensions;
}
@Override
public int size()
{
return values.size();
}
@Override
public int dimension()
{
return dimensions;
}
@Override
public float[] vectorValue(int i)
{
return values.get(i);
}
/** return approximate bytes used by the new vector */
public long add(int ordinal, float[] vector)
{
values.put(ordinal, vector);
return RamEstimation.concurrentHashMapRamUsed(1) + oneVectorBytesUsed();
}
@Override
public boolean isValueShared()
{
return false;
}
@Override
public ConcurrentVectorValues copy()
{
// no actual copy required because we always return distinct float[] for distinct vector ordinals
return this;
}
private long oneVectorBytesUsed()
{
return Integer.BYTES + Integer.BYTES + (long) dimension() * Float.BYTES;
}
}