7d4c077492
Motivation: sun.misc.Unsafe allows us to handle heap ByteBuf in a more efficient matter. We should use special ByteBuf implementation when sun.misc.Unsafe can be used to increase performance. Modifications: - Add PooledUnsafeHeapByteBuf and UnpooledUnsafeHeapByteBuf that are used when sun.misc.Unsafe is ready to use. - Add UnsafeHeapSwappedByteBuf Result: Better performance when using heap buffers and sun.misc.Unsafe is ready to use.
450 lines
13 KiB
Java
450 lines
13 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.buffer;
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import io.netty.util.internal.PlatformDependent;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.channels.ClosedChannelException;
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import java.nio.channels.GatheringByteChannel;
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import java.nio.channels.ScatteringByteChannel;
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/**
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* Big endian Java heap buffer implementation.
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*/
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public class UnpooledHeapByteBuf extends AbstractReferenceCountedByteBuf {
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private final ByteBufAllocator alloc;
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byte[] array;
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private ByteBuffer tmpNioBuf;
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/**
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* Creates a new heap buffer with a newly allocated byte array.
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*
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* @param initialCapacity the initial capacity of the underlying byte array
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* @param maxCapacity the max capacity of the underlying byte array
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*/
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protected UnpooledHeapByteBuf(ByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
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this(alloc, new byte[initialCapacity], 0, 0, maxCapacity);
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}
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/**
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* Creates a new heap buffer with an existing byte array.
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*
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* @param initialArray the initial underlying byte array
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* @param maxCapacity the max capacity of the underlying byte array
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*/
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protected UnpooledHeapByteBuf(ByteBufAllocator alloc, byte[] initialArray, int maxCapacity) {
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this(alloc, initialArray, 0, initialArray.length, maxCapacity);
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}
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private UnpooledHeapByteBuf(
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ByteBufAllocator alloc, byte[] initialArray, int readerIndex, int writerIndex, int maxCapacity) {
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super(maxCapacity);
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if (alloc == null) {
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throw new NullPointerException("alloc");
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}
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if (initialArray == null) {
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throw new NullPointerException("initialArray");
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}
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if (initialArray.length > maxCapacity) {
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throw new IllegalArgumentException(String.format(
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"initialCapacity(%d) > maxCapacity(%d)", initialArray.length, maxCapacity));
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}
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this.alloc = alloc;
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setArray(initialArray);
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setIndex(readerIndex, writerIndex);
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}
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private void setArray(byte[] initialArray) {
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array = initialArray;
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tmpNioBuf = null;
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}
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@Override
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public ByteBufAllocator alloc() {
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return alloc;
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}
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@Override
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public ByteOrder order() {
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return ByteOrder.BIG_ENDIAN;
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}
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@Override
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public boolean isDirect() {
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return false;
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}
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@Override
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public int capacity() {
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ensureAccessible();
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return array.length;
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}
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@Override
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public ByteBuf capacity(int newCapacity) {
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ensureAccessible();
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if (newCapacity < 0 || newCapacity > maxCapacity()) {
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throw new IllegalArgumentException("newCapacity: " + newCapacity);
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}
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int oldCapacity = array.length;
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if (newCapacity > oldCapacity) {
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byte[] newArray = new byte[newCapacity];
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System.arraycopy(array, 0, newArray, 0, array.length);
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setArray(newArray);
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} else if (newCapacity < oldCapacity) {
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byte[] newArray = new byte[newCapacity];
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int readerIndex = readerIndex();
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if (readerIndex < newCapacity) {
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int writerIndex = writerIndex();
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if (writerIndex > newCapacity) {
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writerIndex(writerIndex = newCapacity);
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}
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System.arraycopy(array, readerIndex, newArray, readerIndex, writerIndex - readerIndex);
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} else {
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setIndex(newCapacity, newCapacity);
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}
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setArray(newArray);
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}
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return this;
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}
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@Override
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public boolean hasArray() {
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return true;
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}
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@Override
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public byte[] array() {
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ensureAccessible();
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return array;
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}
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@Override
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public int arrayOffset() {
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return 0;
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}
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@Override
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public boolean hasMemoryAddress() {
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return false;
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}
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@Override
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public long memoryAddress() {
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throw new UnsupportedOperationException();
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}
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@Override
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public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
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checkDstIndex(index, length, dstIndex, dst.capacity());
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if (dst.hasMemoryAddress()) {
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PlatformDependent.copyMemory(array, index, dst.memoryAddress() + dstIndex, length);
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} else if (dst.hasArray()) {
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getBytes(index, dst.array(), dst.arrayOffset() + dstIndex, length);
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} else {
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dst.setBytes(dstIndex, array, index, length);
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}
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return this;
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}
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@Override
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public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
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checkDstIndex(index, length, dstIndex, dst.length);
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System.arraycopy(array, index, dst, dstIndex, length);
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return this;
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}
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@Override
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public ByteBuf getBytes(int index, ByteBuffer dst) {
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ensureAccessible();
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dst.put(array, index, Math.min(capacity() - index, dst.remaining()));
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return this;
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}
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@Override
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public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
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ensureAccessible();
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out.write(array, index, length);
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return this;
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}
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@Override
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public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
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ensureAccessible();
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return getBytes(index, out, length, false);
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}
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private int getBytes(int index, GatheringByteChannel out, int length, boolean internal) throws IOException {
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ensureAccessible();
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ByteBuffer tmpBuf;
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if (internal) {
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tmpBuf = internalNioBuffer();
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} else {
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tmpBuf = ByteBuffer.wrap(array);
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}
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return out.write((ByteBuffer) tmpBuf.clear().position(index).limit(index + length));
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}
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@Override
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public int readBytes(GatheringByteChannel out, int length) throws IOException {
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checkReadableBytes(length);
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int readBytes = getBytes(readerIndex, out, length, true);
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readerIndex += readBytes;
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return readBytes;
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}
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@Override
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public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
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checkSrcIndex(index, length, srcIndex, src.capacity());
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if (src.hasMemoryAddress()) {
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PlatformDependent.copyMemory(src.memoryAddress() + srcIndex, array, index, length);
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} else if (src.hasArray()) {
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setBytes(index, src.array(), src.arrayOffset() + srcIndex, length);
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} else {
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src.getBytes(srcIndex, array, index, length);
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}
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return this;
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}
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@Override
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public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
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checkSrcIndex(index, length, srcIndex, src.length);
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System.arraycopy(src, srcIndex, array, index, length);
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return this;
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}
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@Override
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public ByteBuf setBytes(int index, ByteBuffer src) {
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ensureAccessible();
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src.get(array, index, src.remaining());
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return this;
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}
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@Override
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public int setBytes(int index, InputStream in, int length) throws IOException {
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ensureAccessible();
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return in.read(array, index, length);
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}
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@Override
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public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
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ensureAccessible();
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try {
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return in.read((ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length));
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} catch (ClosedChannelException ignored) {
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return -1;
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}
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}
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@Override
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public int nioBufferCount() {
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return 1;
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}
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@Override
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public ByteBuffer nioBuffer(int index, int length) {
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ensureAccessible();
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return ByteBuffer.wrap(array, index, length).slice();
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}
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@Override
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public ByteBuffer[] nioBuffers(int index, int length) {
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return new ByteBuffer[] { nioBuffer(index, length) };
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}
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@Override
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public ByteBuffer internalNioBuffer(int index, int length) {
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checkIndex(index, length);
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return (ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length);
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}
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@Override
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public byte getByte(int index) {
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ensureAccessible();
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return _getByte(index);
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}
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@Override
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protected byte _getByte(int index) {
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return array[index];
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}
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@Override
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public short getShort(int index) {
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ensureAccessible();
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return _getShort(index);
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}
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@Override
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protected short _getShort(int index) {
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return (short) (array[index] << 8 | array[index + 1] & 0xFF);
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}
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@Override
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public int getUnsignedMedium(int index) {
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ensureAccessible();
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return _getUnsignedMedium(index);
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}
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@Override
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protected int _getUnsignedMedium(int index) {
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return (array[index] & 0xff) << 16 |
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(array[index + 1] & 0xff) << 8 |
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array[index + 2] & 0xff;
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}
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@Override
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public int getInt(int index) {
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ensureAccessible();
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return _getInt(index);
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}
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@Override
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protected int _getInt(int index) {
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return (array[index] & 0xff) << 24 |
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(array[index + 1] & 0xff) << 16 |
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(array[index + 2] & 0xff) << 8 |
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array[index + 3] & 0xff;
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}
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@Override
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public long getLong(int index) {
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ensureAccessible();
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return _getLong(index);
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}
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@Override
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protected long _getLong(int index) {
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return ((long) array[index] & 0xff) << 56 |
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((long) array[index + 1] & 0xff) << 48 |
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((long) array[index + 2] & 0xff) << 40 |
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((long) array[index + 3] & 0xff) << 32 |
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((long) array[index + 4] & 0xff) << 24 |
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((long) array[index + 5] & 0xff) << 16 |
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((long) array[index + 6] & 0xff) << 8 |
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(long) array[index + 7] & 0xff;
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}
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@Override
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public ByteBuf setByte(int index, int value) {
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ensureAccessible();
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_setByte(index, value);
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return this;
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}
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@Override
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protected void _setByte(int index, int value) {
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array[index] = (byte) value;
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}
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@Override
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public ByteBuf setShort(int index, int value) {
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ensureAccessible();
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_setShort(index, value);
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return this;
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}
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@Override
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protected void _setShort(int index, int value) {
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array[index] = (byte) (value >>> 8);
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array[index + 1] = (byte) value;
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}
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@Override
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public ByteBuf setMedium(int index, int value) {
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ensureAccessible();
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_setMedium(index, value);
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return this;
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}
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@Override
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protected void _setMedium(int index, int value) {
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array[index] = (byte) (value >>> 16);
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array[index + 1] = (byte) (value >>> 8);
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array[index + 2] = (byte) value;
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}
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@Override
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public ByteBuf setInt(int index, int value) {
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ensureAccessible();
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_setInt(index, value);
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return this;
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}
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@Override
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protected void _setInt(int index, int value) {
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array[index] = (byte) (value >>> 24);
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array[index + 1] = (byte) (value >>> 16);
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array[index + 2] = (byte) (value >>> 8);
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array[index + 3] = (byte) value;
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}
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@Override
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public ByteBuf setLong(int index, long value) {
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ensureAccessible();
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_setLong(index, value);
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return this;
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}
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@Override
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protected void _setLong(int index, long value) {
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array[index] = (byte) (value >>> 56);
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array[index + 1] = (byte) (value >>> 48);
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array[index + 2] = (byte) (value >>> 40);
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array[index + 3] = (byte) (value >>> 32);
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array[index + 4] = (byte) (value >>> 24);
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array[index + 5] = (byte) (value >>> 16);
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array[index + 6] = (byte) (value >>> 8);
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array[index + 7] = (byte) value;
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}
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@Override
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public ByteBuf copy(int index, int length) {
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checkIndex(index, length);
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byte[] copiedArray = new byte[length];
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System.arraycopy(array, index, copiedArray, 0, length);
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return new UnpooledHeapByteBuf(alloc(), copiedArray, maxCapacity());
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}
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private ByteBuffer internalNioBuffer() {
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ByteBuffer tmpNioBuf = this.tmpNioBuf;
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if (tmpNioBuf == null) {
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this.tmpNioBuf = tmpNioBuf = ByteBuffer.wrap(array);
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}
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return tmpNioBuf;
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}
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@Override
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protected void deallocate() {
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array = null;
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}
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@Override
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public ByteBuf unwrap() {
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return null;
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}
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}
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