UnpooledUnsafeDirectByteBuf.java — netty Source File

Source Code

/*
 * 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.CleanableDirectBuffer;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.UnstableApi;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;

/**
 * A NIO {@link ByteBuffer} based buffer. It is recommended to use
 * {@link UnpooledByteBufAllocator#directBuffer(int, int)}, {@link Unpooled#directBuffer(int)} and
 * {@link Unpooled#wrappedBuffer(ByteBuffer)} instead of calling the constructor explicitly.}
 */
public class UnpooledUnsafeDirectByteBuf extends UnpooledDirectByteBuf {

    long memoryAddress;

    /**
     * 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
     */
    public UnpooledUnsafeDirectByteBuf(ByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
        super(alloc, initialCapacity, maxCapacity);
    }

    /**
     * Creates a new direct buffer by wrapping the specified initial buffer.
     *
     * @param maxCapacity the maximum capacity of the underlying direct buffer
     */
    protected UnpooledUnsafeDirectByteBuf(ByteBufAllocator alloc, ByteBuffer initialBuffer, int maxCapacity) {
        // We never try to free the buffer if it was provided by the end-user as we don't know if this is a duplicate or
        // a slice. This is done to prevent an IllegalArgumentException when using Java9 as Unsafe.invokeCleaner(...)
        // will check if the given buffer is either a duplicate or slice and in this case throw an
        // IllegalArgumentException.
        //
        // See https://hg.openjdk.java.net/jdk9/hs-demo/jdk/file/0d2ab72ba600/src/jdk.unsupported/share/classes/
        // sun/misc/Unsafe.java#l1250
        //
        // We also call slice() explicitly here to preserve behaviour with previous netty releases.
// ... (283 more lines)