io.netty.buffer.PooledByteBuf Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS 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.ObjectPool.Handle;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
abstract class PooledByteBuf extends AbstractReferenceCountedByteBuf {
private final Handle> recyclerHandle;
protected PoolChunk chunk;
protected long handle;
protected T memory;
protected int offset;
protected int length;
int maxLength;
PoolThreadCache cache;
ByteBuffer tmpNioBuf;
private ByteBufAllocator allocator;
@SuppressWarnings("unchecked")
protected PooledByteBuf(Handle> recyclerHandle, int maxCapacity) {
super(maxCapacity);
this.recyclerHandle = (Handle>) recyclerHandle;
}
void init(PoolChunk chunk, ByteBuffer nioBuffer,
long handle, int offset, int length, int maxLength, PoolThreadCache cache) {
init0(chunk, nioBuffer, handle, offset, length, maxLength, cache);
}
void initUnpooled(PoolChunk chunk, int length) {
init0(chunk, null, 0, chunk.offset, length, length, null);
}
private void init0(PoolChunk chunk, ByteBuffer nioBuffer,
long handle, int offset, int length, int maxLength, PoolThreadCache cache) {
assert handle >= 0;
assert chunk != null;
this.chunk = chunk;
memory = chunk.memory;
tmpNioBuf = nioBuffer;
allocator = chunk.arena.parent;
this.cache = cache;
this.handle = handle;
this.offset = offset;
this.length = length;
this.maxLength = maxLength;
}
/**
* Method must be called before reuse this {@link PooledByteBufAllocator}
*/
final void reuse(int maxCapacity) {
maxCapacity(maxCapacity);
resetRefCnt();
setIndex0(0, 0);
discardMarks();
}
@Override
public final int capacity() {
return length;
}
@Override
public int maxFastWritableBytes() {
return Math.min(maxLength, maxCapacity()) - writerIndex;
}
@Override
public final ByteBuf capacity(int newCapacity) {
if (newCapacity == length) {
ensureAccessible();
return this;
}
checkNewCapacity(newCapacity);
if (!chunk.unpooled) {
// If the request capacity does not require reallocation, just update the length of the memory.
if (newCapacity > length) {
if (newCapacity <= maxLength) {
length = newCapacity;
return this;
}
} else if (newCapacity > maxLength >>> 1 &&
(maxLength > 512 || newCapacity > maxLength - 16)) {
// here newCapacity < length
length = newCapacity;
trimIndicesToCapacity(newCapacity);
return this;
}
}
// Reallocation required.
chunk.arena.reallocate(this, newCapacity, true);
return this;
}
@Override
public final ByteBufAllocator alloc() {
return allocator;
}
@Override
public final ByteOrder order() {
return ByteOrder.BIG_ENDIAN;
}
@Override
public final ByteBuf unwrap() {
return null;
}
@Override
public final ByteBuf retainedDuplicate() {
return PooledDuplicatedByteBuf.newInstance(this, this, readerIndex(), writerIndex());
}
@Override
public final ByteBuf retainedSlice() {
final int index = readerIndex();
return retainedSlice(index, writerIndex() - index);
}
@Override
public final ByteBuf retainedSlice(int index, int length) {
return PooledSlicedByteBuf.newInstance(this, this, index, length);
}
protected final ByteBuffer internalNioBuffer() {
ByteBuffer tmpNioBuf = this.tmpNioBuf;
if (tmpNioBuf == null) {
this.tmpNioBuf = tmpNioBuf = newInternalNioBuffer(memory);
} else {
tmpNioBuf.clear();
}
return tmpNioBuf;
}
protected abstract ByteBuffer newInternalNioBuffer(T memory);
@Override
protected final void deallocate() {
if (handle >= 0) {
final long handle = this.handle;
this.handle = -1;
memory = null;
chunk.arena.free(chunk, tmpNioBuf, handle, maxLength, cache);
tmpNioBuf = null;
chunk = null;
recycle();
}
}
private void recycle() {
recyclerHandle.recycle(this);
}
protected final int idx(int index) {
return offset + index;
}
final ByteBuffer _internalNioBuffer(int index, int length, boolean duplicate) {
index = idx(index);
ByteBuffer buffer = duplicate ? newInternalNioBuffer(memory) : internalNioBuffer();
buffer.limit(index + length).position(index);
return buffer;
}
ByteBuffer duplicateInternalNioBuffer(int index, int length) {
checkIndex(index, length);
return _internalNioBuffer(index, length, true);
}
@Override
public final ByteBuffer internalNioBuffer(int index, int length) {
checkIndex(index, length);
return _internalNioBuffer(index, length, false);
}
@Override
public final int nioBufferCount() {
return 1;
}
@Override
public final ByteBuffer nioBuffer(int index, int length) {
return duplicateInternalNioBuffer(index, length).slice();
}
@Override
public final ByteBuffer[] nioBuffers(int index, int length) {
return new ByteBuffer[] { nioBuffer(index, length) };
}
@Override
public final boolean isContiguous() {
return true;
}
@Override
public final int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
return out.write(duplicateInternalNioBuffer(index, length));
}
@Override
public final int readBytes(GatheringByteChannel out, int length) throws IOException {
checkReadableBytes(length);
int readBytes = out.write(_internalNioBuffer(readerIndex, length, false));
readerIndex += readBytes;
return readBytes;
}
@Override
public final int getBytes(int index, FileChannel out, long position, int length) throws IOException {
return out.write(duplicateInternalNioBuffer(index, length), position);
}
@Override
public final int readBytes(FileChannel out, long position, int length) throws IOException {
checkReadableBytes(length);
int readBytes = out.write(_internalNioBuffer(readerIndex, length, false), position);
readerIndex += readBytes;
return readBytes;
}
@Override
public final int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
try {
return in.read(internalNioBuffer(index, length));
} catch (ClosedChannelException ignored) {
return -1;
}
}
@Override
public final int setBytes(int index, FileChannel in, long position, int length) throws IOException {
try {
return in.read(internalNioBuffer(index, length), position);
} catch (ClosedChannelException ignored) {
return -1;
}
}
}