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/*
* 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.jdbc.internal.spi.block;
import com.facebook.presto.jdbc.internal.spi.type.MapType;
import com.facebook.presto.jdbc.internal.spi.type.Type;
import com.facebook.presto.jdbc.internal.jol.info.ClassLayout;
import java.lang.invoke.MethodHandle;
import java.util.Arrays;
import java.util.function.BiConsumer;
import static com.facebook.presto.jdbc.internal.spi.block.MapBlockBuilder.buildHashTable;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.sizeOf;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
public class MapBlock
extends AbstractMapBlock
{
private static final int INSTANCE_SIZE = ClassLayout.parseClass(MapBlock.class).instanceSize();
private final int startOffset;
private final int positionCount;
private final boolean[] mapIsNull;
private final int[] offsets;
private final Block keyBlock;
private final Block valueBlock;
private final int[] hashTables; // hash to location in map;
private volatile long sizeInBytes;
private final long retainedSizeInBytes;
/**
* Create a map block directly from columnar nulls, keys, values, and offsets into the keys and values.
* A null map must have no entries.
*
* @param mapType key type K
* @param keyBlockNativeEquals equality between key stack type and a block+position; signature is (K, Block, int)boolean
* @param keyNativeHashCode hash of a key stack type; signature is (K)long
*/
public static MapBlock fromKeyValueBlock(
boolean[] mapIsNull,
int[] offsets,
Block keyBlock,
Block valueBlock,
MapType mapType,
MethodHandle keyBlockNativeEquals,
MethodHandle keyNativeHashCode,
MethodHandle keyBlockHashCode)
{
validateConstructorArguments(0, mapIsNull.length, mapIsNull, offsets, keyBlock, valueBlock, mapType.getKeyType(), keyBlockNativeEquals, keyNativeHashCode);
int mapCount = mapIsNull.length;
int elementCount = keyBlock.getPositionCount();
int[] hashTables = new int[elementCount * HASH_MULTIPLIER];
Arrays.fill(hashTables, -1);
for (int i = 0; i < mapCount; i++) {
int keyOffset = offsets[i];
int keyCount = offsets[i + 1] - keyOffset;
if (keyCount < 0) {
throw new IllegalArgumentException(format("Offset is not monotonically ascending. offsets[%s]=%s, offsets[%s]=%s", i, offsets[i], i + 1, offsets[i + 1]));
}
if (mapIsNull[i] && keyCount != 0) {
throw new IllegalArgumentException("A null map must have zero entries");
}
buildHashTable(keyBlock, keyOffset, keyCount, keyBlockHashCode, hashTables, keyOffset * HASH_MULTIPLIER, keyCount * HASH_MULTIPLIER);
}
return createMapBlockInternal(
0,
mapCount,
mapIsNull,
offsets,
keyBlock,
valueBlock,
hashTables,
mapType.getKeyType(),
keyBlockNativeEquals,
keyNativeHashCode);
}
/**
* Create a map block directly without per element validations.
*
* Internal use by this package and com.facebook.presto.jdbc.internal.spi.Type only.
*
* @param keyType key type K
* @param keyBlockNativeEquals equality between key stack type and a block+position; signature is (K, Block, int)boolean
* @param keyNativeHashCode hash of a key stack type; signature is (K)long
*/
public static MapBlock createMapBlockInternal(
int startOffset,
int positionCount,
boolean[] mapIsNull,
int[] offsets,
Block keyBlock,
Block valueBlock,
int[] hashTables,
Type keyType,
MethodHandle keyBlockNativeEquals,
MethodHandle keyNativeHashCode)
{
validateConstructorArguments(startOffset, positionCount, mapIsNull, offsets, keyBlock, valueBlock, keyType, keyBlockNativeEquals, keyNativeHashCode);
return new MapBlock(startOffset, positionCount, mapIsNull, offsets, keyBlock, valueBlock, hashTables, keyType, keyBlockNativeEquals, keyNativeHashCode);
}
private static void validateConstructorArguments(
int startOffset,
int positionCount,
boolean[] mapIsNull,
int[] offsets,
Block keyBlock,
Block valueBlock,
Type keyType,
MethodHandle keyBlockNativeEquals,
MethodHandle keyNativeHashCode)
{
if (startOffset < 0) {
throw new IllegalArgumentException("startOffset is negative");
}
if (positionCount < 0) {
throw new IllegalArgumentException("positionCount is negative");
}
requireNonNull(mapIsNull, "mapIsNull is null");
if (mapIsNull.length - startOffset < positionCount) {
throw new IllegalArgumentException("isNull length is less than positionCount");
}
requireNonNull(offsets, "offsets is null");
if (offsets.length - startOffset < positionCount + 1) {
throw new IllegalArgumentException("offsets length is less than positionCount");
}
requireNonNull(keyBlock, "keyBlock is null");
requireNonNull(valueBlock, "valueBlock is null");
if (keyBlock.getPositionCount() != valueBlock.getPositionCount()) {
throw new IllegalArgumentException(format("keyBlock and valueBlock has different size: %s %s", keyBlock.getPositionCount(), valueBlock.getPositionCount()));
}
requireNonNull(keyType, "keyType is null");
requireNonNull(keyBlockNativeEquals, "keyBlockNativeEquals is null");
requireNonNull(keyNativeHashCode, "keyNativeHashCode is null");
}
/**
* Use createRowBlockInternal or fromKeyValueBlock instead of this method. The caller of this method is assumed to have
* validated the arguments with validateConstructorArguments.
*/
private MapBlock(
int startOffset,
int positionCount,
boolean[] mapIsNull,
int[] offsets,
Block keyBlock,
Block valueBlock,
int[] hashTables,
Type keyType,
MethodHandle keyBlockNativeEquals,
MethodHandle keyNativeHashCode)
{
super(keyType, keyNativeHashCode, keyBlockNativeEquals);
requireNonNull(hashTables, "hashTables is null");
if (hashTables.length < keyBlock.getPositionCount() * HASH_MULTIPLIER) {
throw new IllegalArgumentException(format("keyBlock/valueBlock size does not match hash table size: %s %s", keyBlock.getPositionCount(), hashTables.length));
}
this.startOffset = startOffset;
this.positionCount = positionCount;
this.mapIsNull = mapIsNull;
this.offsets = offsets;
this.keyBlock = keyBlock;
this.valueBlock = valueBlock;
this.hashTables = hashTables;
this.sizeInBytes = -1;
this.retainedSizeInBytes = INSTANCE_SIZE + keyBlock.getRetainedSizeInBytes() + valueBlock.getRetainedSizeInBytes() + sizeOf(offsets) + sizeOf(mapIsNull) + sizeOf(hashTables);
}
@Override
protected Block getRawKeyBlock()
{
return keyBlock;
}
@Override
protected Block getRawValueBlock()
{
return valueBlock;
}
@Override
protected int[] getHashTables()
{
return hashTables;
}
@Override
protected int[] getOffsets()
{
return offsets;
}
@Override
protected int getOffsetBase()
{
return startOffset;
}
@Override
protected boolean[] getMapIsNull()
{
return mapIsNull;
}
@Override
public int getPositionCount()
{
return positionCount;
}
@Override
public long getSizeInBytes()
{
if (sizeInBytes < 0) {
calculateSize();
}
return sizeInBytes;
}
private void calculateSize()
{
int entriesStart = offsets[startOffset];
int entriesEnd = offsets[startOffset + positionCount];
int entryCount = entriesEnd - entriesStart;
sizeInBytes = keyBlock.getRegionSizeInBytes(entriesStart, entryCount) +
valueBlock.getRegionSizeInBytes(entriesStart, entryCount) +
(Integer.BYTES + Byte.BYTES) * (long) this.positionCount +
Integer.BYTES * HASH_MULTIPLIER * (long) entryCount;
}
@Override
public long getRetainedSizeInBytes()
{
return retainedSizeInBytes;
}
@Override
public void retainedBytesForEachPart(BiConsumer consumer)
{
consumer.accept(keyBlock, keyBlock.getRetainedSizeInBytes());
consumer.accept(valueBlock, valueBlock.getRetainedSizeInBytes());
consumer.accept(offsets, sizeOf(offsets));
consumer.accept(mapIsNull, sizeOf(mapIsNull));
consumer.accept(hashTables, sizeOf(hashTables));
consumer.accept(this, (long) INSTANCE_SIZE);
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder("MapBlock{");
sb.append("positionCount=").append(getPositionCount());
sb.append('}');
return sb.toString();
}
@Override
public Block getLoadedBlock()
{
if (keyBlock != keyBlock.getLoadedBlock()) {
// keyBlock has to be loaded since MapBlock constructs hash table eagerly.
throw new IllegalStateException();
}
Block loadedValueBlock = valueBlock.getLoadedBlock();
if (loadedValueBlock == valueBlock) {
return this;
}
return createMapBlockInternal(
startOffset,
positionCount,
mapIsNull,
offsets,
keyBlock,
loadedValueBlock,
hashTables,
keyType,
keyBlockNativeEquals,
keyNativeHashCode);
}
}
