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io.netty.buffer.UnpooledUnsafeDirectByteBuf Maven / Gradle / Ivy
/*
* 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.ResourceLeak;
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;
import java.util.ArrayDeque;
import java.util.Queue;
/**
* 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.
*/
final class UnpooledUnsafeDirectByteBuf extends AbstractReferenceCountedByteBuf {
private static final boolean NATIVE_ORDER = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
private final ResourceLeak leak = leakDetector.open(this);
private final ByteBufAllocator alloc;
private long memoryAddress;
private ByteBuffer buffer;
private ByteBuffer tmpNioBuf;
private int capacity;
private boolean doNotFree;
private Queue suspendedDeallocations;
/**
* 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
*/
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(ByteBuffer.allocateDirect(initialCapacity));
}
/**
* Creates a new direct buffer by wrapping the specified initial buffer.
*
* @param maxCapacity the maximum capacity of the underlying direct buffer
*/
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);
}
private void setByteBuffer(ByteBuffer buffer) {
ByteBuffer oldBuffer = this.buffer;
if (oldBuffer != null) {
if (doNotFree) {
doNotFree = false;
} else {
if (suspendedDeallocations == null) {
PlatformDependent.freeDirectBuffer(oldBuffer);
} else {
suspendedDeallocations.add(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 = ByteBuffer.allocateDirect(newCapacity);
oldBuffer.position(readerIndex).limit(writerIndex);
newBuffer.position(readerIndex).limit(writerIndex);
newBuffer.put(oldBuffer);
newBuffer.clear();
setByteBuffer(newBuffer);
} else if (newCapacity < oldCapacity) {
ByteBuffer oldBuffer = buffer;
ByteBuffer newBuffer = ByteBuffer.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() {
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) {
checkIndex(index);
if (dst == null) {
throw new NullPointerException("dst");
}
int bytesToCopy = Math.min(capacity() - index, dst.remaining());
ByteBuffer tmpBuf = internalNioBuffer();
tmpBuf.clear().position(index).limit(index + bytesToCopy);
dst.put(tmpBuf);
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 (buffer.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 {
ensureAccessible();
if (length == 0) {
return 0;
}
ByteBuffer tmpBuf = internalNioBuffer();
tmpBuf.clear().position(index).limit(index + length);
return out.write(tmpBuf);
}
@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 tmpNioBuf = internalNioBuffer();
tmpNioBuf.clear().position(index).limit(index + length);
try {
return in.read(tmpNioBuf);
} catch (ClosedChannelException e) {
return -1;
}
}
@Override
public int nioBufferCount() {
return 1;
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
ensureAccessible();
if (index == 0 && length == capacity()) {
return buffer.duplicate();
} else {
return ((ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length)).slice();
}
}
@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);
UnpooledUnsafeDirectByteBuf copy = (UnpooledUnsafeDirectByteBuf) alloc().directBuffer(length, maxCapacity());
if (length != 0) {
PlatformDependent.copyMemory(addr(index), copy.addr(0), length);
copy.setIndex(0, length);
}
return copy;
}
private ByteBuffer internalNioBuffer() {
ByteBuffer tmpNioBuf = this.tmpNioBuf;
if (tmpNioBuf == null) {
this.tmpNioBuf = tmpNioBuf = buffer.duplicate();
}
return tmpNioBuf;
}
@Override
protected void deallocate() {
ByteBuffer buffer = this.buffer;
if (buffer == null) {
return;
}
this.buffer = null;
resumeIntermediaryDeallocations();
if (!doNotFree) {
PlatformDependent.freeDirectBuffer(buffer);
}
leak.close();
}
@Override
public ByteBuf suspendIntermediaryDeallocations() {
ensureAccessible();
if (suspendedDeallocations == null) {
suspendedDeallocations = new ArrayDeque(2);
}
return this;
}
@Override
public ByteBuf resumeIntermediaryDeallocations() {
if (suspendedDeallocations == null) {
return this;
}
Queue suspendedDeallocations = this.suspendedDeallocations;
this.suspendedDeallocations = null;
for (ByteBuffer buf: suspendedDeallocations) {
PlatformDependent.freeDirectBuffer(buf);
}
return this;
}
@Override
public ByteBuf unwrap() {
return null;
}
private long addr(int index) {
return memoryAddress + index;
}
}
