com.esotericsoftware.kryo.io.UnsafeMemoryOutput Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of kryo-slf4j-shaded Show documentation
Show all versions of kryo-slf4j-shaded Show documentation
Fork of Esoteric Software's Kryo built by Nathan Sweet that replaces Minlog with slf4j as the logging facade. This contains the shaded reflectasm jar to prevent conflicts with other versions of asm.
The newest version!
/* Copyright (c) 2008, Nathan Sweet
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the distribution.
* - Neither the name of Esoteric Software nor the names of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
package com.esotericsoftware.kryo.io;
import java.io.DataOutput;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import sun.nio.ch.DirectBuffer;
import static com.esotericsoftware.kryo.util.UnsafeUtil.*;
import com.esotericsoftware.kryo.KryoException;
import com.esotericsoftware.kryo.util.Util;
/** An optimized OutputStream that writes data directly into the off-heap memory. Utility methods are provided for efficiently
* writing primitive types, arrays of primitive types and strings. It uses @link{sun.misc.Unsafe} to achieve a very good
* performance.
*
*
* Important notes:
*
This class increases performance, but may result in bigger size of serialized representation.
* Bulk operations, e.g. on arrays of primitive types, are always using native byte order.
* Fixed-size char, int, long, short, float and double elements are always written using native byte order.
* Best performance is achieved if no variable length encoding for integers is used.
* Output serialized using this class should always be deserilized using @link{UnsafeMemoryInput}
*
*
* @author Roman Levenstein */
public final class UnsafeMemoryOutput extends ByteBufferOutput {
/** Start address of the memory buffer The memory buffer should be non-movable, which normally means that is is allocated
* off-heap */
private long bufaddress;
private final static boolean isLittleEndian = ByteOrder.nativeOrder().equals(ByteOrder.LITTLE_ENDIAN);
{
varIntsEnabled = false;
}
/** Creates an uninitialized Output. {@link #setBuffer(byte[])} must be called before the Output is used. */
public UnsafeMemoryOutput () {
}
/** Creates a new Output for writing to a byte array.
*
* @param bufferSize The initial and maximum size of the buffer. An exception is thrown if this size is exceeded. */
public UnsafeMemoryOutput (int bufferSize) {
this(bufferSize, bufferSize);
}
/** Creates a new Output for writing to a byte array.
*
* @param bufferSize The initial size of the buffer.
* @param maxBufferSize The buffer is doubled as needed until it exceeds maxBufferSize and an exception is thrown. */
public UnsafeMemoryOutput (int bufferSize, int maxBufferSize) {
super(bufferSize, maxBufferSize);
updateBufferAddress();
}
/** Creates a new Output for writing to an OutputStream. A buffer size of 4096 is used. */
public UnsafeMemoryOutput (OutputStream outputStream) {
super(outputStream);
updateBufferAddress();
}
/** Creates a new Output for writing to an OutputStream. */
public UnsafeMemoryOutput (OutputStream outputStream, int bufferSize) {
super(outputStream, bufferSize);
updateBufferAddress();
}
public UnsafeMemoryOutput (long address, int maxBufferSize) {
super(address, maxBufferSize);
updateBufferAddress();
}
public void setBuffer (ByteBuffer buffer, int maxBufferSize) {
super.setBuffer(buffer, maxBufferSize);
updateBufferAddress();
}
private void updateBufferAddress () {
bufaddress = ((DirectBuffer)super.niobuffer).address();
}
/** Writes a 4 byte int. */
final public void writeInt (int value) throws KryoException {
require(4);
unsafe().putInt(bufaddress + position, value);
position += 4;
}
/** Writes a 4 byte float. */
final public void writeFloat (float value) throws KryoException {
require(4);
unsafe().putFloat(bufaddress + position, value);
position += 4;
}
/** Writes a 2 byte short. */
final public void writeShort (int value) throws KryoException {
require(2);
unsafe().putShort(bufaddress + position, (short)value);
position += 2;
}
/** Writes an 8 byte long. */
final public void writeLong (long value) throws KryoException {
require(8);
unsafe().putLong(bufaddress + position, value);
position += 8;
}
final public void writeByte (int value) throws KryoException {
super.niobuffer.position(position);
super.writeByte(value);
}
public void writeByte (byte value) throws KryoException {
super.niobuffer.position(position);
super.writeByte(value);
}
/** Writes a 1 byte boolean. */
final public void writeBoolean (boolean value) throws KryoException {
super.niobuffer.position(position);
super.writeBoolean(value);
}
/** Writes a 2 byte char. */
final public void writeChar (char value) throws KryoException {
require(2);
unsafe().putChar(bufaddress + position, value);
position += 2;
}
/** Writes an 8 byte double. */
final public void writeDouble (double value) throws KryoException {
require(8);
unsafe().putDouble(bufaddress + position, value);
position += 8;
}
final public int writeInt (int value, boolean optimizePositive) throws KryoException {
if (!varIntsEnabled) {
writeInt(value);
return 4;
} else
return writeVarInt(value, optimizePositive);
}
final public int writeLong (long value, boolean optimizePositive) throws KryoException {
if (!varIntsEnabled) {
writeLong(value);
return 8;
} else
return writeVarLong(value, optimizePositive);
}
final public int writeVarInt (int val, boolean optimizePositive) throws KryoException {
long value = val;
if (!optimizePositive) value = (value << 1) ^ (value >> 31);
long varInt = 0;
varInt = (value & 0x7F);
value >>>= 7;
if (value == 0) {
writeByte((byte)varInt);
return 1;
}
varInt |= 0x80;
varInt |= ((value & 0x7F) << 8);
value >>>= 7;
if (value == 0) {
writeLittleEndianInt((int)varInt);
position -= 2;
return 2;
}
varInt |= (0x80 << 8);
varInt |= ((value & 0x7F) << 16);
value >>>= 7;
if (value == 0) {
writeLittleEndianInt((int)varInt);
position -= 1;
return 3;
}
varInt |= (0x80 << 16);
varInt |= ((value & 0x7F) << 24);
value >>>= 7;
if (value == 0) {
writeLittleEndianInt((int)varInt);
position -= 0;
return 4;
}
varInt |= (0x80 << 24);
varInt |= ((value & 0x7F) << 32);
varInt &= 0xFFFFFFFFL;
writeLittleEndianLong(varInt);
position -= 3;
return 5;
}
final public int writeVarLong (long value, boolean optimizePositive) throws KryoException {
if (!optimizePositive) value = (value << 1) ^ (value >> 63);
int varInt = 0;
varInt = (int)(value & 0x7F);
value >>>= 7;
if (value == 0) {
write(varInt);
return 1;
}
varInt |= 0x80;
varInt |= ((value & 0x7F) << 8);
value >>>= 7;
if (value == 0) {
writeLittleEndianInt(varInt);
position -= 2;
return 2;
}
varInt |= (0x80 << 8);
varInt |= ((value & 0x7F) << 16);
value >>>= 7;
if (value == 0) {
writeLittleEndianInt(varInt);
position -= 1;
return 3;
}
varInt |= (0x80 << 16);
varInt |= ((value & 0x7F) << 24);
value >>>= 7;
if (value == 0) {
writeLittleEndianInt(varInt);
position -= 0;
return 4;
}
varInt |= (0x80 << 24);
long varLong = (varInt & 0xFFFFFFFFL) | (((long)(value & 0x7F)) << 32);
value >>>= 7;
if (value == 0) {
writeLittleEndianLong(varLong);
position -= 3;
return 5;
}
varLong |= (0x80L << 32);
varLong |= (((long)(value & 0x7F)) << 40);
value >>>= 7;
if (value == 0) {
writeLittleEndianLong(varLong);
position -= 2;
return 6;
}
varLong |= (0x80L << 40);
varLong |= (((long)(value & 0x7F)) << 48);
value >>>= 7;
if (value == 0) {
writeLittleEndianLong(varLong);
position -= 1;
return 7;
}
varLong |= (0x80L << 48);
varLong |= (((long)(value & 0x7F)) << 56);
value >>>= 7;
if (value == 0) {
writeLittleEndianLong(varLong);
return 8;
}
varLong |= (0x80L << 56);
writeLittleEndianLong(varLong);
write((byte)((value & 0x7F)));
return 9;
}
final private void writeLittleEndianInt (int val) {
if (isLittleEndian)
writeInt(val);
else
writeInt(Util.swapInt(val));
}
final private void writeLittleEndianLong (long val) {
if (isLittleEndian)
writeLong(val);
else
writeLong(Util.swapLong(val));
}
// Methods implementing bulk operations on arrays of primitive types
final public void writeInts (int[] object, boolean optimizePositive) throws KryoException {
if (!varIntsEnabled) {
int bytesToCopy = object.length << 2;
writeBytes(object, intArrayBaseOffset, 0, bytesToCopy);
} else
super.writeInts(object, optimizePositive);
}
final public void writeLongs (long[] object, boolean optimizePositive) throws KryoException {
if (!varIntsEnabled) {
int bytesToCopy = object.length << 3;
writeBytes(object, longArrayBaseOffset, 0, bytesToCopy);
} else
super.writeLongs(object, optimizePositive);
}
final public void writeInts (int[] object) throws KryoException {
int bytesToCopy = object.length << 2;
writeBytes(object, intArrayBaseOffset, 0, bytesToCopy);
}
final public void writeLongs (long[] object) throws KryoException {
int bytesToCopy = object.length << 3;
writeBytes(object, longArrayBaseOffset, 0, bytesToCopy);
}
final public void writeFloats (float[] object) throws KryoException {
int bytesToCopy = object.length << 2;
writeBytes(object, floatArrayBaseOffset, 0, bytesToCopy);
}
final public void writeShorts (short[] object) throws KryoException {
int bytesToCopy = object.length << 1;
writeBytes(object, shortArrayBaseOffset, 0, bytesToCopy);
}
final public void writeChars (char[] object) throws KryoException {
int bytesToCopy = object.length << 1;
writeBytes(object, charArrayBaseOffset, 0, bytesToCopy);
}
final public void writeDoubles (double[] object) throws KryoException {
int bytesToCopy = object.length << 3;
writeBytes(object, doubleArrayBaseOffset, 0, bytesToCopy);
}
/*** Output count bytes from a memory region starting at the given #{offset} inside the in-memory representation of obj object.
* @param obj
* @param offset
* @param count */
final public void writeBytes (Object obj, long offset, long count) throws KryoException {
writeBytes(obj, 0, offset, count);
}
/*** Output count bytes from a memory region starting at the given #{offset} inside the in-memory representation of obj object.
* The destination is defined by its address */
final private void writeBytes (Object srcArray, long srcArrayTypeOffset, long srcOffset, long count) throws KryoException {
int copyCount = Math.min(capacity - position, (int)count);
while (true) {
unsafe().copyMemory(srcArray, srcArrayTypeOffset + srcOffset, null, bufaddress + position, copyCount);
position += copyCount;
count -= copyCount;
if (count == 0) return;
srcOffset += copyCount;
copyCount = Math.min(capacity, (int)count);
require(copyCount);
}
}
}