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/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.buffer;
import io.netty.util.internal.PlatformDependent;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
/**
* A NIO {@link ByteBuffer} based buffer. It is recommended to use
* {@link UnpooledByteBufAllocator#directBuffer(int, int)}, {@link Unpooled#directBuffer(int)} and
* {@link Unpooled#wrappedBuffer(ByteBuffer)} instead of calling the constructor explicitly.}
*/
public class UnpooledUnsafeDirectByteBuf extends AbstractReferenceCountedByteBuf {
private final ByteBufAllocator alloc;
private ByteBuffer tmpNioBuf;
private int capacity;
private boolean doNotFree;
ByteBuffer buffer;
long memoryAddress;
/**
* Creates a new direct buffer.
*
* @param initialCapacity the initial capacity of the underlying direct buffer
* @param maxCapacity the maximum capacity of the underlying direct buffer
*/
public UnpooledUnsafeDirectByteBuf(ByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
super(maxCapacity);
if (alloc == null) {
throw new NullPointerException("alloc");
}
if (initialCapacity < 0) {
throw new IllegalArgumentException("initialCapacity: " + initialCapacity);
}
if (maxCapacity < 0) {
throw new IllegalArgumentException("maxCapacity: " + maxCapacity);
}
if (initialCapacity > maxCapacity) {
throw new IllegalArgumentException(String.format(
"initialCapacity(%d) > maxCapacity(%d)", initialCapacity, maxCapacity));
}
this.alloc = alloc;
setByteBuffer(allocateDirect(initialCapacity), false);
}
/**
* Creates a new direct buffer by wrapping the specified initial buffer.
*
* @param maxCapacity the maximum capacity of the underlying direct buffer
*/
protected UnpooledUnsafeDirectByteBuf(ByteBufAllocator alloc, ByteBuffer initialBuffer, int maxCapacity) {
// We never try to free the buffer if it was provided by the end-user as we not know if this is an duplicate or
// an slice. This is done to prevent an IllegalArgumentException when using Java9 as Unsafe.invokeCleaner(...)
// will check if the given buffer is either an duplicate or slice and in this case throw an
// IllegalArgumentException.
//
// See http://hg.openjdk.java.net/jdk9/hs-demo/jdk/file/0d2ab72ba600/src/jdk.unsupported/share/classes/
// sun/misc/Unsafe.java#l1250
//
// We also call slice() explicitly here to preserve behaviour with previous netty releases.
this(alloc, initialBuffer.slice(), maxCapacity, false);
}
UnpooledUnsafeDirectByteBuf(ByteBufAllocator alloc, ByteBuffer initialBuffer, int maxCapacity, boolean doFree) {
super(maxCapacity);
if (alloc == null) {
throw new NullPointerException("alloc");
}
if (initialBuffer == null) {
throw new NullPointerException("initialBuffer");
}
if (!initialBuffer.isDirect()) {
throw new IllegalArgumentException("initialBuffer is not a direct buffer.");
}
if (initialBuffer.isReadOnly()) {
throw new IllegalArgumentException("initialBuffer is a read-only buffer.");
}
int initialCapacity = initialBuffer.remaining();
if (initialCapacity > maxCapacity) {
throw new IllegalArgumentException(String.format(
"initialCapacity(%d) > maxCapacity(%d)", initialCapacity, maxCapacity));
}
this.alloc = alloc;
doNotFree = !doFree;
setByteBuffer(initialBuffer.order(ByteOrder.BIG_ENDIAN), false);
writerIndex(initialCapacity);
}
/**
* Allocate a new direct {@link ByteBuffer} with the given initialCapacity.
*/
protected ByteBuffer allocateDirect(int initialCapacity) {
return ByteBuffer.allocateDirect(initialCapacity);
}
/**
* Free a direct {@link ByteBuffer}
*/
protected void freeDirect(ByteBuffer buffer) {
PlatformDependent.freeDirectBuffer(buffer);
}
final void setByteBuffer(ByteBuffer buffer, boolean tryFree) {
if (tryFree) {
ByteBuffer oldBuffer = this.buffer;
if (oldBuffer != null) {
if (doNotFree) {
doNotFree = false;
} else {
freeDirect(oldBuffer);
}
}
}
this.buffer = buffer;
memoryAddress = PlatformDependent.directBufferAddress(buffer);
tmpNioBuf = null;
capacity = buffer.remaining();
}
@Override
public boolean isDirect() {
return true;
}
@Override
public int capacity() {
return capacity;
}
@Override
public ByteBuf capacity(int newCapacity) {
checkNewCapacity(newCapacity);
int readerIndex = readerIndex();
int writerIndex = writerIndex();
int oldCapacity = capacity;
if (newCapacity > oldCapacity) {
ByteBuffer oldBuffer = buffer;
ByteBuffer newBuffer = allocateDirect(newCapacity);
oldBuffer.position(0).limit(oldBuffer.capacity());
newBuffer.position(0).limit(oldBuffer.capacity());
newBuffer.put(oldBuffer);
newBuffer.clear();
setByteBuffer(newBuffer, true);
} else if (newCapacity < oldCapacity) {
ByteBuffer oldBuffer = buffer;
ByteBuffer newBuffer = allocateDirect(newCapacity);
if (readerIndex < newCapacity) {
if (writerIndex > newCapacity) {
writerIndex(writerIndex = newCapacity);
}
oldBuffer.position(readerIndex).limit(writerIndex);
newBuffer.position(readerIndex).limit(writerIndex);
newBuffer.put(oldBuffer);
newBuffer.clear();
} else {
setIndex(newCapacity, newCapacity);
}
setByteBuffer(newBuffer, true);
}
return this;
}
@Override
public ByteBufAllocator alloc() {
return alloc;
}
@Override
public ByteOrder order() {
return ByteOrder.BIG_ENDIAN;
}
@Override
public boolean hasArray() {
return false;
}
@Override
public byte[] array() {
throw new UnsupportedOperationException("direct buffer");
}
@Override
public int arrayOffset() {
throw new UnsupportedOperationException("direct buffer");
}
@Override
public boolean hasMemoryAddress() {
return true;
}
@Override
public long memoryAddress() {
ensureAccessible();
return memoryAddress;
}
@Override
protected byte _getByte(int index) {
return UnsafeByteBufUtil.getByte(addr(index));
}
@Override
protected short _getShort(int index) {
return UnsafeByteBufUtil.getShort(addr(index));
}
@Override
protected int _getUnsignedMedium(int index) {
return UnsafeByteBufUtil.getUnsignedMedium(addr(index));
}
@Override
protected int _getInt(int index) {
return UnsafeByteBufUtil.getInt(addr(index));
}
@Override
protected long _getLong(int index) {
return UnsafeByteBufUtil.getLong(addr(index));
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
UnsafeByteBufUtil.getBytes(this, addr(index), index, dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
UnsafeByteBufUtil.getBytes(this, addr(index), index, dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
UnsafeByteBufUtil.getBytes(this, addr(index), index, dst);
return this;
}
@Override
public ByteBuf readBytes(ByteBuffer dst) {
int length = dst.remaining();
checkReadableBytes(length);
getBytes(readerIndex, dst);
readerIndex += length;
return this;
}
@Override
protected void _setByte(int index, int value) {
UnsafeByteBufUtil.setByte(addr(index), value);
}
@Override
protected void _setShort(int index, int value) {
UnsafeByteBufUtil.setShort(addr(index), value);
}
@Override
protected void _setMedium(int index, int value) {
UnsafeByteBufUtil.setMedium(addr(index), value);
}
@Override
protected void _setInt(int index, int value) {
UnsafeByteBufUtil.setInt(addr(index), value);
}
@Override
protected void _setLong(int index, long value) {
UnsafeByteBufUtil.setLong(addr(index), value);
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
UnsafeByteBufUtil.setBytes(this, addr(index), index, src, srcIndex, length);
return this;
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
UnsafeByteBufUtil.setBytes(this, addr(index), index, src, srcIndex, length);
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
UnsafeByteBufUtil.setBytes(this, addr(index), index, src);
return this;
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
UnsafeByteBufUtil.getBytes(this, addr(index), index, out, length);
return this;
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
return getBytes(index, out, length, false);
}
private int getBytes(int index, GatheringByteChannel out, int length, boolean internal) throws IOException {
ensureAccessible();
if (length == 0) {
return 0;
}
ByteBuffer tmpBuf;
if (internal) {
tmpBuf = internalNioBuffer();
} else {
tmpBuf = buffer.duplicate();
}
tmpBuf.clear().position(index).limit(index + length);
return out.write(tmpBuf);
}
@Override
public int readBytes(GatheringByteChannel out, int length) throws IOException {
checkReadableBytes(length);
int readBytes = getBytes(readerIndex, out, length, true);
readerIndex += readBytes;
return readBytes;
}
@Override
public int setBytes(int index, InputStream in, int length) throws IOException {
return UnsafeByteBufUtil.setBytes(this, addr(index), index, in, length);
}
@Override
public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
ensureAccessible();
ByteBuffer tmpBuf = internalNioBuffer();
tmpBuf.clear().position(index).limit(index + length);
try {
return in.read(tmpBuf);
} catch (ClosedChannelException ignored) {
return -1;
}
}
@Override
public int nioBufferCount() {
return 1;
}
@Override
public ByteBuffer[] nioBuffers(int index, int length) {
return new ByteBuffer[] { nioBuffer(index, length) };
}
@Override
public ByteBuf copy(int index, int length) {
return UnsafeByteBufUtil.copy(this, addr(index), index, length);
}
@Override
public ByteBuffer internalNioBuffer(int index, int length) {
checkIndex(index, length);
return (ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length);
}
private ByteBuffer internalNioBuffer() {
ByteBuffer tmpNioBuf = this.tmpNioBuf;
if (tmpNioBuf == null) {
this.tmpNioBuf = tmpNioBuf = buffer.duplicate();
}
return tmpNioBuf;
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
checkIndex(index, length);
return ((ByteBuffer) buffer.duplicate().position(index).limit(index + length)).slice();
}
@Override
protected void deallocate() {
ByteBuffer buffer = this.buffer;
if (buffer == null) {
return;
}
this.buffer = null;
if (!doNotFree) {
freeDirect(buffer);
}
}
@Override
public ByteBuf unwrap() {
return null;
}
long addr(int index) {
return memoryAddress + index;
}
@Override
protected SwappedByteBuf newSwappedByteBuf() {
if (PlatformDependent.isUnaligned()) {
// Only use if unaligned access is supported otherwise there is no gain.
return new UnsafeDirectSwappedByteBuf(this);
}
return super.newSwappedByteBuf();
}
@Override
public ByteBuf setZero(int index, int length) {
checkIndex(index, length);
UnsafeByteBufUtil.setZero(addr(index), length);
return this;
}
@Override
public ByteBuf writeZero(int length) {
ensureWritable(length);
int wIndex = writerIndex;
UnsafeByteBufUtil.setZero(addr(wIndex), length);
writerIndex = wIndex + length;
return this;
}
}
