/*
* 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.operator.aggregation.TypedHistogram;
import com.facebook.presto.spi.function.AccumulatorStateFactory;
import static java.util.Objects.requireNonNull;
public class HistogramStateFactory
implements AccumulatorStateFactory<HistogramState>
{
@Override
public HistogramState createSingleState()
{
return new SingleState();
}
@Override
public Class<? extends HistogramState> getSingleStateClass()
{
return SingleState.class;
}
@Override
public HistogramState createGroupedState()
{
return new GroupedState();
}
@Override
public Class<? extends HistogramState> getGroupedStateClass()
{
return GroupedState.class;
}
public static class GroupedState
extends AbstractGroupedAccumulatorState
implements HistogramState
{
private final ObjectBigArray<TypedHistogram> typedHistogram = new ObjectBigArray<>();
private long size;
@Override
public void ensureCapacity(long size)
{
typedHistogram.ensureCapacity(size);
}
@Override
public TypedHistogram get()
{
return typedHistogram.get(getGroupId());
}
@Override
public void set(TypedHistogram value)
{
requireNonNull(value, "value is null");
TypedHistogram previous = get();
if (previous != null) {
size -= previous.getEstimatedSize();
}
typedHistogram.set(getGroupId(), value);
size += value.getEstimatedSize();
}
@Override
public void addMemoryUsage(long memory)
{
size += memory;
}
@Override
public long getEstimatedSize()
{
return size + typedHistogram.sizeOf();
}
}
public static class SingleState
implements HistogramState
{
private TypedHistogram typedHistogram;
@Override
public TypedHistogram get()
{
return typedHistogram;
}
@Override
public void set(TypedHistogram value)
{
typedHistogram = value;
}
@Override
public void addMemoryUsage(long memory)
{
}
@Override
public long getEstimatedSize()
{
if (typedHistogram == null) {
return 0;
}
return typedHistogram.getEstimatedSize();
}
}
}