/*
* 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.rcfile;
import io.airlift.slice.Slice;
import io.airlift.slice.SliceOutput;
import io.airlift.slice.Slices;
import org.openjdk.jol.info.ClassLayout;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UncheckedIOException;
import java.nio.charset.Charset;
import java.util.Arrays;
import static com.google.common.base.Preconditions.checkArgument;
import static io.airlift.slice.SizeOf.SIZE_OF_BYTE;
import static io.airlift.slice.SizeOf.SIZE_OF_INT;
import static io.airlift.slice.SizeOf.SIZE_OF_LONG;
import static io.airlift.slice.SizeOf.SIZE_OF_SHORT;
import static java.lang.Math.toIntExact;
public class BufferedOutputStreamSliceOutput
extends SliceOutput
{
private static final int INSTANCE_SIZE = ClassLayout.parseClass(BufferedOutputStreamSliceOutput.class).instanceSize();
private static final int MINIMUM_CHUNK_SIZE = 4096;
private final OutputStream outputStream;
private final Slice slice;
private final byte[] buffer;
/**
* Offset of buffer within stream.
*/
private long bufferOffset;
/**
* Current position for writing in buffer.
*/
private int bufferPosition;
public BufferedOutputStreamSliceOutput(OutputStream outputStream, int bufferSize)
{
checkArgument(bufferSize >= MINIMUM_CHUNK_SIZE, "minimum buffer size of " + MINIMUM_CHUNK_SIZE + " required");
if (outputStream == null) {
throw new NullPointerException("outputStream is null");
}
this.outputStream = outputStream;
this.buffer = new byte[bufferSize];
this.slice = Slices.wrappedBuffer(buffer);
}
@Override
public void flush()
throws IOException
{
flushBufferToOutputStream();
outputStream.flush();
}
@Override
public void close()
throws IOException
{
flushBufferToOutputStream();
outputStream.close();
}
@Override
public void reset()
{
throw new UnsupportedOperationException("OutputStream can not be reset");
}
@Override
public void reset(int position)
{
throw new UnsupportedOperationException("OutputStream can not be reset");
}
@Override
public int size()
{
return toIntExact(bufferOffset + bufferPosition);
}
@Override
public int getRetainedSize()
{
return slice.getRetainedSize() + INSTANCE_SIZE;
}
@Override
public int writableBytes()
{
return Integer.MAX_VALUE;
}
@Override
public boolean isWritable()
{
return true;
}
@Override
public void writeByte(int value)
{
ensureWritableBytes(SIZE_OF_BYTE);
slice.setByte(bufferPosition, value);
bufferPosition += SIZE_OF_BYTE;
}
@Override
public void writeShort(int value)
{
ensureWritableBytes(SIZE_OF_SHORT);
slice.setShort(bufferPosition, value);
bufferPosition += SIZE_OF_SHORT;
}
@Override
public void writeInt(int value)
{
ensureWritableBytes(SIZE_OF_INT);
slice.setInt(bufferPosition, value);
bufferPosition += SIZE_OF_INT;
}
@Override
public void writeLong(long value)
{
ensureWritableBytes(SIZE_OF_LONG);
slice.setLong(bufferPosition, value);
bufferPosition += SIZE_OF_LONG;
}
@Override
public void writeFloat(float value)
{
writeInt(Float.floatToIntBits(value));
}
@Override
public void writeDouble(double value)
{
writeLong(Double.doubleToLongBits(value));
}
@Override
public void writeBytes(Slice source)
{
writeBytes(source, 0, source.length());
}
@Override
public void writeBytes(Slice source, int sourceIndex, int length)
{
// Write huge chunks direct to OutputStream
if (length >= MINIMUM_CHUNK_SIZE) {
flushBufferToOutputStream();
writeToOutputStream(source, sourceIndex, length);
bufferOffset += length;
}
else {
ensureWritableBytes(length);
slice.setBytes(bufferPosition, source, sourceIndex, length);
bufferPosition += length;
}
}
@Override
public void writeBytes(byte[] source)
{
writeBytes(source, 0, source.length);
}
@Override
public void writeBytes(byte[] source, int sourceIndex, int length)
{
// Write huge chunks direct to OutputStream
if (length >= MINIMUM_CHUNK_SIZE) {
flushBufferToOutputStream();
writeToOutputStream(source, sourceIndex, length);
bufferOffset += length;
}
else {
ensureWritableBytes(length);
slice.setBytes(bufferPosition, source, sourceIndex, length);
bufferPosition += length;
}
}
@Override
public void writeBytes(InputStream in, int length)
throws IOException
{
while (length > 0) {
int batch = ensureBatchSize(length);
slice.setBytes(bufferPosition, in, batch);
bufferPosition += batch;
length -= batch;
}
}
@Override
public void writeZero(int length)
{
checkArgument(length >= 0, "length must be 0 or greater than 0.");
while (length > 0) {
int batch = ensureBatchSize(length);
Arrays.fill(buffer, bufferPosition, bufferPosition + batch, (byte) 0);
bufferPosition += batch;
length -= batch;
}
}
@Override
public SliceOutput appendLong(long value)
{
writeLong(value);
return this;
}
@Override
public SliceOutput appendDouble(double value)
{
writeDouble(value);
return this;
}
@Override
public SliceOutput appendInt(int value)
{
writeInt(value);
return this;
}
@Override
public SliceOutput appendShort(int value)
{
writeShort(value);
return this;
}
@Override
public SliceOutput appendByte(int value)
{
writeByte(value);
return this;
}
@Override
public SliceOutput appendBytes(byte[] source, int sourceIndex, int length)
{
writeBytes(source, sourceIndex, length);
return this;
}
@Override
public SliceOutput appendBytes(byte[] source)
{
writeBytes(source);
return this;
}
@Override
public SliceOutput appendBytes(Slice slice)
{
writeBytes(slice);
return this;
}
@Override
public Slice slice()
{
throw new UnsupportedOperationException();
}
@Override
public Slice getUnderlyingSlice()
{
throw new UnsupportedOperationException();
}
@Override
public String toString(Charset charset)
{
return toString();
}
@Override
public String toString()
{
StringBuilder builder = new StringBuilder("OutputStreamSliceOutputAdapter{");
builder.append("outputStream=").append(outputStream);
builder.append("bufferSize=").append(slice.length());
builder.append('}');
return builder.toString();
}
private void ensureWritableBytes(int minWritableBytes)
{
if (bufferPosition + minWritableBytes > slice.length()) {
flushBufferToOutputStream();
}
}
private int ensureBatchSize(int length)
{
ensureWritableBytes(Math.min(MINIMUM_CHUNK_SIZE, length));
return Math.min(length, slice.length() - bufferPosition);
}
private void flushBufferToOutputStream()
{
writeToOutputStream(buffer, 0, bufferPosition);
bufferOffset += bufferPosition;
bufferPosition = 0;
}
private void writeToOutputStream(byte[] source, int sourceIndex, int length)
{
try {
outputStream.write(source, sourceIndex, length);
}
catch (IOException e) {
throw new UncheckedIOException(e);
}
}
private void writeToOutputStream(Slice source, int sourceIndex, int length)
{
try {
source.getBytes(sourceIndex, outputStream, length);
}
catch (IOException e) {
throw new UncheckedIOException(e);
}
}
}