/*
* Licensed 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 com.facebook.presto.operator.aggregation.state;
import com.facebook.presto.array.ObjectBigArray;
import com.facebook.presto.spi.function.AccumulatorStateFactory;
import io.airlift.stats.cardinality.HyperLogLog;
import static java.util.Objects.requireNonNull;
public class HyperLogLogStateFactory
implements AccumulatorStateFactory<HyperLogLogState>
{
@Override
public HyperLogLogState createSingleState()
{
return new SingleHyperLogLogState();
}
@Override
public Class<? extends HyperLogLogState> getSingleStateClass()
{
return SingleHyperLogLogState.class;
}
@Override
public HyperLogLogState createGroupedState()
{
return new GroupedHyperLogLogState();
}
@Override
public Class<? extends HyperLogLogState> getGroupedStateClass()
{
return GroupedHyperLogLogState.class;
}
public static class GroupedHyperLogLogState
extends AbstractGroupedAccumulatorState
implements HyperLogLogState
{
private final ObjectBigArray<HyperLogLog> hlls = new ObjectBigArray<>();
private long size;
@Override
public void ensureCapacity(long size)
{
hlls.ensureCapacity(size);
}
@Override
public HyperLogLog getHyperLogLog()
{
return hlls.get(getGroupId());
}
@Override
public void setHyperLogLog(HyperLogLog value)
{
requireNonNull(value, "value is null");
hlls.set(getGroupId(), value);
}
@Override
public void addMemoryUsage(int value)
{
size += value;
}
@Override
public long getEstimatedSize()
{
return size + hlls.sizeOf();
}
}
public static class SingleHyperLogLogState
implements HyperLogLogState
{
private HyperLogLog hll;
@Override
public HyperLogLog getHyperLogLog()
{
return hll;
}
@Override
public void setHyperLogLog(HyperLogLog value)
{
hll = value;
}
@Override
public void addMemoryUsage(int value)
{
// noop
}
@Override
public long getEstimatedSize()
{
if (hll == null) {
return 0;
}
return hll.estimatedInMemorySize();
}
}
}