/*
* 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.TypedKeyValueHeap;
import com.facebook.presto.spi.function.AccumulatorStateFactory;
public class MinMaxByNStateFactory
implements AccumulatorStateFactory<MinMaxByNState>
{
@Override
public MinMaxByNState createSingleState()
{
return new SingleMinMaxByNState();
}
@Override
public Class<? extends MinMaxByNState> getSingleStateClass()
{
return SingleMinMaxByNState.class;
}
@Override
public MinMaxByNState createGroupedState()
{
return new GroupedMinMaxByNState();
}
@Override
public Class<? extends MinMaxByNState> getGroupedStateClass()
{
return GroupedMinMaxByNState.class;
}
public static class GroupedMinMaxByNState
extends AbstractGroupedAccumulatorState
implements MinMaxByNState
{
private final ObjectBigArray<TypedKeyValueHeap> heaps = new ObjectBigArray<>();
private long size;
@Override
public void ensureCapacity(long size)
{
heaps.ensureCapacity(size);
}
@Override
public long getEstimatedSize()
{
return heaps.sizeOf() + size;
}
@Override
public TypedKeyValueHeap getTypedKeyValueHeap()
{
return heaps.get(getGroupId());
}
@Override
public void setTypedKeyValueHeap(TypedKeyValueHeap value)
{
TypedKeyValueHeap previous = getTypedKeyValueHeap();
if (previous != null) {
size -= previous.getEstimatedSize();
}
heaps.set(getGroupId(), value);
size += value.getEstimatedSize();
}
@Override
public void addMemoryUsage(long memory)
{
size += memory;
}
}
public static class SingleMinMaxByNState
implements MinMaxByNState
{
private TypedKeyValueHeap typedKeyValueHeap;
@Override
public long getEstimatedSize()
{
if (typedKeyValueHeap == null) {
return 0;
}
return typedKeyValueHeap.getEstimatedSize();
}
@Override
public TypedKeyValueHeap getTypedKeyValueHeap()
{
return typedKeyValueHeap;
}
@Override
public void setTypedKeyValueHeap(TypedKeyValueHeap typedKeyValueHeap)
{
this.typedKeyValueHeap = typedKeyValueHeap;
}
@Override
public void addMemoryUsage(long memory)
{
}
}
}