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com.facebook.presto.jdbc.internal.spi.block.FixedWidthBlockBuilder Maven / Gradle / Ivy
/*
* 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.airlift.slice.DynamicSliceOutput;
import com.facebook.presto.jdbc.internal.airlift.slice.Slice;
import com.facebook.presto.jdbc.internal.airlift.slice.SliceOutput;
import com.facebook.presto.jdbc.internal.airlift.slice.Slices;
import com.facebook.presto.jdbc.internal.jol.info.ClassLayout;
import javax.annotation.Nullable;
import java.util.List;
import java.util.function.BiConsumer;
import static com.facebook.presto.jdbc.internal.spi.block.BlockUtil.MAX_ARRAY_SIZE;
import static com.facebook.presto.jdbc.internal.spi.block.BlockUtil.calculateBlockResetSize;
import static com.facebook.presto.jdbc.internal.spi.block.BlockUtil.checkValidPositions;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_BYTE;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_INT;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_LONG;
import static com.facebook.presto.jdbc.internal.airlift.slice.SizeOf.SIZE_OF_SHORT;
public class FixedWidthBlockBuilder
extends AbstractFixedWidthBlock
implements BlockBuilder
{
private static final int INSTANCE_SIZE = ClassLayout.parseClass(FixedWidthBlockBuilder.class).instanceSize();
@Nullable
private BlockBuilderStatus blockBuilderStatus;
private boolean initialized;
private int initialEntryCount;
private SliceOutput sliceOutput = new DynamicSliceOutput(0);
private SliceOutput valueIsNull = new DynamicSliceOutput(0);
private int positionCount;
private int currentEntrySize;
public FixedWidthBlockBuilder(int fixedSize, @Nullable BlockBuilderStatus blockBuilderStatus, int expectedEntries)
{
super(fixedSize);
this.blockBuilderStatus = blockBuilderStatus;
initialEntryCount = expectedEntries;
}
public FixedWidthBlockBuilder(int fixedSize, int positionCount)
{
super(fixedSize);
initialized = true;
Slice slice = Slices.allocate(fixedSize * positionCount);
this.blockBuilderStatus = new BlockBuilderStatus();
this.sliceOutput = slice.getOutput();
this.valueIsNull = Slices.allocate(positionCount).getOutput();
}
@Override
protected Slice getRawSlice()
{
return sliceOutput.getUnderlyingSlice();
}
@Override
public int getPositionCount()
{
return positionCount;
}
@Override
public long getSizeInBytes()
{
return sliceOutput.size() + (long) valueIsNull.size();
}
@Override
public long getRetainedSizeInBytes()
{
long size = INSTANCE_SIZE + sliceOutput.getRetainedSize() + valueIsNull.getRetainedSize();
if (blockBuilderStatus != null) {
size += BlockBuilderStatus.INSTANCE_SIZE;
}
return size;
}
@Override
public void retainedBytesForEachPart(BiConsumer consumer)
{
consumer.accept(sliceOutput, sliceOutput.getRetainedSize());
consumer.accept(valueIsNull, valueIsNull.getRetainedSize());
consumer.accept(this, (long) INSTANCE_SIZE);
}
@Override
public Block copyPositions(List positions)
{
checkValidPositions(positions, positionCount);
SliceOutput newSlice = Slices.allocate(positions.size() * fixedSize).getOutput();
SliceOutput newValueIsNull = Slices.allocate(positions.size()).getOutput();
for (int position : positions) {
newValueIsNull.appendByte(valueIsNull.getUnderlyingSlice().getByte(position));
newSlice.appendBytes(getRawSlice().getBytes(position * fixedSize, fixedSize));
}
return new FixedWidthBlock(fixedSize, positions.size(), newSlice.slice(), newValueIsNull.slice());
}
@Override
public BlockBuilder writeByte(int value)
{
checkCapacity();
sliceOutput.writeByte(value);
currentEntrySize += SIZE_OF_BYTE;
return this;
}
@Override
public BlockBuilder writeShort(int value)
{
checkCapacity();
sliceOutput.writeShort(value);
currentEntrySize += SIZE_OF_SHORT;
return this;
}
@Override
public BlockBuilder writeInt(int value)
{
checkCapacity();
sliceOutput.writeInt(value);
currentEntrySize += SIZE_OF_INT;
return this;
}
@Override
public BlockBuilder writeLong(long value)
{
checkCapacity();
sliceOutput.writeLong(value);
currentEntrySize += SIZE_OF_LONG;
return this;
}
@Override
public BlockBuilder writeBytes(Slice source, int sourceIndex, int length)
{
if (length != fixedSize) {
throw new IllegalStateException("Expected entry size to be exactly " + fixedSize + " but was " + currentEntrySize);
}
checkCapacity();
sliceOutput.writeBytes(source, sourceIndex, length);
currentEntrySize += length;
return this;
}
@Override
public BlockBuilder closeEntry()
{
if (currentEntrySize != fixedSize) {
throw new IllegalStateException("Expected entry size to be exactly " + fixedSize + " but was " + currentEntrySize);
}
entryAdded(false);
currentEntrySize = 0;
return this;
}
@Override
public BlockBuilder appendNull()
{
if (currentEntrySize > 0) {
throw new IllegalStateException("Current entry must be closed before a null can be written");
}
checkCapacity();
// fixed width is always written regardless of null flag
sliceOutput.writeZero(fixedSize);
entryAdded(true);
return this;
}
private void entryAdded(boolean isNull)
{
checkCapacity();
valueIsNull.appendByte(isNull ? 1 : 0);
positionCount++;
if (blockBuilderStatus != null) {
blockBuilderStatus.addBytes(Byte.BYTES + fixedSize);
}
}
private void checkCapacity()
{
// this code is structured this way so the expensive checks happen
// on the uncommon path for JVM inlining decision
if (!initialized) {
initializeCapacity();
}
}
private void initializeCapacity()
{
if (positionCount != 0 || currentEntrySize != 0) {
throw new IllegalStateException(getClass().getSimpleName() + " was used before initialization");
}
int initialSliceOutputSize = (int) Math.min((long) fixedSize * initialEntryCount, MAX_ARRAY_SIZE);
sliceOutput = new DynamicSliceOutput(initialSliceOutputSize);
valueIsNull = new DynamicSliceOutput(initialEntryCount);
initialized = true;
}
@Override
protected boolean isEntryNull(int position)
{
return valueIsNull.getUnderlyingSlice().getByte(position) != 0;
}
@Override
public Block getRegion(int positionOffset, int length)
{
int positionCount = getPositionCount();
if (positionOffset < 0 || length < 0 || positionOffset + length > positionCount) {
throw new IndexOutOfBoundsException("Invalid position " + positionOffset + " in block with " + positionCount + " positions");
}
Slice newSlice = sliceOutput.slice().slice(positionOffset * fixedSize, length * fixedSize);
Slice newValueIsNull = valueIsNull.slice().slice(positionOffset, length);
return new FixedWidthBlock(fixedSize, length, newSlice, newValueIsNull);
}
@Override
public Block copyRegion(int positionOffset, int length)
{
int positionCount = getPositionCount();
if (positionOffset < 0 || length < 0 || positionOffset + length > positionCount) {
throw new IndexOutOfBoundsException("Invalid position " + positionOffset + " in block with " + positionCount + " positions");
}
Slice newSlice = Slices.copyOf(sliceOutput.getUnderlyingSlice(), positionOffset * fixedSize, length * fixedSize);
Slice newValueIsNull = Slices.copyOf(valueIsNull.getUnderlyingSlice(), positionOffset, length);
return new FixedWidthBlock(fixedSize, length, newSlice, newValueIsNull);
}
@Override
public Block build()
{
if (currentEntrySize > 0) {
throw new IllegalStateException("Current entry must be closed before the block can be built");
}
return new FixedWidthBlock(fixedSize, positionCount, sliceOutput.slice(), valueIsNull.slice());
}
@Override
public BlockBuilder newBlockBuilderLike(BlockBuilderStatus blockBuilderStatus)
{
return new FixedWidthBlockBuilder(fixedSize, blockBuilderStatus, calculateBlockResetSize(positionCount));
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder("FixedWidthBlockBuilder{");
sb.append("positionCount=").append(positionCount);
sb.append(", fixedSize=").append(fixedSize);
sb.append(", size=").append(sliceOutput.size());
sb.append('}');
return sb.toString();
}
}
