io.netty.buffer.UnpooledUnsafeDirectByteBuf Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including
all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and
Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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 Unpooled#directBuffer(int)}
* and {@link Unpooled#wrappedBuffer(ByteBuffer)} instead of calling the
* constructor explicitly.
*/
public class UnpooledUnsafeDirectByteBuf extends AbstractReferenceCountedByteBuf {
private static final boolean NATIVE_ORDER = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
private final ByteBufAllocator alloc;
private long memoryAddress;
private ByteBuffer buffer;
private ByteBuffer tmpNioBuf;
private int capacity;
private boolean doNotFree;
/**
* 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
*/
protected 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));
}
/**
* 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) {
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 = true;
setByteBuffer(initialBuffer.slice().order(ByteOrder.BIG_ENDIAN));
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);
}
private void setByteBuffer(ByteBuffer buffer) {
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) {
ensureAccessible();
if (newCapacity < 0 || newCapacity > maxCapacity()) {
throw new IllegalArgumentException("newCapacity: " + 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);
} 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);
}
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 PlatformDependent.getByte(addr(index));
}
@Override
protected short _getShort(int index) {
short v = PlatformDependent.getShort(addr(index));
return NATIVE_ORDER? v : Short.reverseBytes(v);
}
@Override
protected int _getUnsignedMedium(int index) {
long addr = addr(index);
return (PlatformDependent.getByte(addr) & 0xff) << 16 |
(PlatformDependent.getByte(addr + 1) & 0xff) << 8 |
PlatformDependent.getByte(addr + 2) & 0xff;
}
@Override
protected int _getInt(int index) {
int v = PlatformDependent.getInt(addr(index));
return NATIVE_ORDER? v : Integer.reverseBytes(v);
}
@Override
protected long _getLong(int index) {
long v = PlatformDependent.getLong(addr(index));
return NATIVE_ORDER? v : Long.reverseBytes(v);
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
checkIndex(index, length);
if (dst == null) {
throw new NullPointerException("dst");
}
if (dstIndex < 0 || dstIndex > dst.capacity() - length) {
throw new IndexOutOfBoundsException("dstIndex: " + dstIndex);
}
if (dst.hasMemoryAddress()) {
PlatformDependent.copyMemory(addr(index), dst.memoryAddress() + dstIndex, length);
} else if (dst.hasArray()) {
PlatformDependent.copyMemory(addr(index), dst.array(), dst.arrayOffset() + dstIndex, length);
} else {
dst.setBytes(dstIndex, this, index, length);
}
return this;
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
checkIndex(index, length);
if (dst == null) {
throw new NullPointerException("dst");
}
if (dstIndex < 0 || dstIndex > dst.length - length) {
throw new IndexOutOfBoundsException(String.format(
"dstIndex: %d, length: %d (expected: range(0, %d))", dstIndex, length, dst.length));
}
if (length != 0) {
PlatformDependent.copyMemory(addr(index), dst, dstIndex, length);
}
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
getBytes(index, dst, false);
return this;
}
private void getBytes(int index, ByteBuffer dst, boolean internal) {
checkIndex(index);
if (dst == null) {
throw new NullPointerException("dst");
}
int bytesToCopy = Math.min(capacity() - index, dst.remaining());
ByteBuffer tmpBuf;
if (internal) {
tmpBuf = internalNioBuffer();
} else {
tmpBuf = buffer.duplicate();
}
tmpBuf.clear().position(index).limit(index + bytesToCopy);
dst.put(tmpBuf);
}
@Override
public ByteBuf readBytes(ByteBuffer dst) {
int length = dst.remaining();
checkReadableBytes(length);
getBytes(readerIndex, dst, true);
readerIndex += length;
return this;
}
@Override
protected void _setByte(int index, int value) {
PlatformDependent.putByte(addr(index), (byte) value);
}
@Override
protected void _setShort(int index, int value) {
PlatformDependent.putShort(addr(index), NATIVE_ORDER ? (short) value : Short.reverseBytes((short) value));
}
@Override
protected void _setMedium(int index, int value) {
long addr = addr(index);
PlatformDependent.putByte(addr, (byte) (value >>> 16));
PlatformDependent.putByte(addr + 1, (byte) (value >>> 8));
PlatformDependent.putByte(addr + 2, (byte) value);
}
@Override
protected void _setInt(int index, int value) {
PlatformDependent.putInt(addr(index), NATIVE_ORDER ? value : Integer.reverseBytes(value));
}
@Override
protected void _setLong(int index, long value) {
PlatformDependent.putLong(addr(index), NATIVE_ORDER ? value : Long.reverseBytes(value));
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
checkIndex(index, length);
if (src == null) {
throw new NullPointerException("src");
}
if (srcIndex < 0 || srcIndex > src.capacity() - length) {
throw new IndexOutOfBoundsException("srcIndex: " + srcIndex);
}
if (length != 0) {
if (src.hasMemoryAddress()) {
PlatformDependent.copyMemory(src.memoryAddress() + srcIndex, addr(index), length);
} else if (src.hasArray()) {
PlatformDependent.copyMemory(src.array(), src.arrayOffset() + srcIndex, addr(index), length);
} else {
src.getBytes(srcIndex, this, index, length);
}
}
return this;
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
checkIndex(index, length);
if (length != 0) {
PlatformDependent.copyMemory(src, srcIndex, addr(index), length);
}
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
ensureAccessible();
ByteBuffer tmpBuf = internalNioBuffer();
if (src == tmpBuf) {
src = src.duplicate();
}
tmpBuf.clear().position(index).limit(index + src.remaining());
tmpBuf.put(src);
return this;
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
ensureAccessible();
if (length != 0) {
byte[] tmp = new byte[length];
PlatformDependent.copyMemory(addr(index), tmp, 0, length);
out.write(tmp);
}
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 {
checkIndex(index, length);
byte[] tmp = new byte[length];
int readBytes = in.read(tmp);
if (readBytes > 0) {
PlatformDependent.copyMemory(tmp, 0, addr(index), readBytes);
}
return readBytes;
}
@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) {
checkIndex(index, length);
ByteBuf copy = alloc().directBuffer(length, maxCapacity());
if (length != 0) {
if (copy.hasMemoryAddress()) {
PlatformDependent.copyMemory(addr(index), copy.memoryAddress(), length);
copy.setIndex(0, length);
} else {
copy.writeBytes(this, index, length);
}
}
return copy;
}
@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() {
return new UnsafeDirectSwappedByteBuf(this);
}
}
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