io.netty.buffer.PooledByteBuf 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:
*
* https://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, 0, 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;
assert !PoolChunk.isSubpage(handle) || chunk.arena.size2SizeIdx(maxLength) <= chunk.arena.smallMaxSizeIdx:
"Allocated small sub-page handle for a buffer size that isn't \"small.\"";
chunk.incrementPinnedMemory(maxLength);
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.decrementPinnedMemory(maxLength);
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.decrementPinnedMemory(maxLength);
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;
}
}
}
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