126 lines
3.9 KiB
Java
126 lines
3.9 KiB
Java
/*
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* Copyright 2013 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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* https://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.net5.buffer;
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import static java.util.Objects.requireNonNull;
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import java.nio.ByteBuffer;
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import io.net5.util.internal.PlatformDependent;
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/**
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* Read-only ByteBuf which wraps a read-only direct ByteBuffer and use unsafe for best performance.
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*/
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final class ReadOnlyUnsafeDirectByteBuf extends ReadOnlyByteBufferBuf {
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private final long memoryAddress;
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ReadOnlyUnsafeDirectByteBuf(ByteBufAllocator allocator, ByteBuffer byteBuffer) {
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super(allocator, byteBuffer);
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// Use buffer as the super class will slice the passed in ByteBuffer which means the memoryAddress
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// may be different if the position != 0.
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memoryAddress = PlatformDependent.directBufferAddress(buffer);
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}
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@Override
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protected byte _getByte(int index) {
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return UnsafeByteBufUtil.getByte(addr(index));
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}
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@Override
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protected short _getShort(int index) {
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return UnsafeByteBufUtil.getShort(addr(index));
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}
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@Override
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protected int _getUnsignedMedium(int index) {
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return UnsafeByteBufUtil.getUnsignedMedium(addr(index));
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}
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@Override
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protected int _getInt(int index) {
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return UnsafeByteBufUtil.getInt(addr(index));
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}
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@Override
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protected long _getLong(int index) {
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return UnsafeByteBufUtil.getLong(addr(index));
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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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checkIndex(index, length);
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requireNonNull(dst, "dst");
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if (dstIndex < 0 || dstIndex > dst.capacity() - length) {
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throw new IndexOutOfBoundsException("dstIndex: " + dstIndex);
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}
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if (dst.hasMemoryAddress()) {
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PlatformDependent.copyMemory(addr(index), dst.memoryAddress() + dstIndex, length);
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} else if (dst.hasArray()) {
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PlatformDependent.copyMemory(addr(index), dst.array(), dst.arrayOffset() + dstIndex, length);
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} else {
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dst.setBytes(dstIndex, this, 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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checkIndex(index, length);
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requireNonNull(dst, "dst");
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if (dstIndex < 0 || dstIndex > dst.length - length) {
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throw new IndexOutOfBoundsException(String.format(
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"dstIndex: %d, length: %d (expected: range(0, %d))", dstIndex, length, dst.length));
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}
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if (length != 0) {
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PlatformDependent.copyMemory(addr(index), dst, dstIndex, 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 copy(int index, int length) {
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checkIndex(index, length);
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ByteBuf copy = alloc().directBuffer(length, maxCapacity());
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if (length != 0) {
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if (copy.hasMemoryAddress()) {
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PlatformDependent.copyMemory(addr(index), copy.memoryAddress(), length);
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copy.setIndex(0, length);
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} else {
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copy.writeBytes(this, index, length);
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}
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}
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return copy;
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}
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@Override
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public boolean hasMemoryAddress() {
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return true;
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}
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@Override
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public long memoryAddress() {
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return memoryAddress;
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}
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private long addr(int index) {
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return memoryAddress + index;
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}
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}
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