UnpooledDirectByteBuf.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.ObjectUtil;
import io.netty.util.internal.PlatformDependent;

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

import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;

/**
 * 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 UnpooledDirectByteBuf extends AbstractReferenceCountedByteBuf {

    private final ByteBufAllocator alloc;

    CleanableDirectBuffer cleanable;
    ByteBuffer buffer; // accessed by UnpooledUnsafeNoCleanerDirectByteBuf.reallocateDirect()
    private ByteBuffer tmpNioBuf;
    private int capacity;
    private boolean doNotFree;

    /**
     * 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 UnpooledDirectByteBuf(ByteBufAllocator alloc, int initialCapacity, int maxCapacity) {
        super(maxCapacity);
        ObjectUtil.checkNotNull(alloc, "alloc");
        checkPositiveOrZero(initialCapacity, "initialCapacity");
        checkPositiveOrZero(maxCapacity, "maxCapacity");
        if (initialCapacity > maxCapacity) {
// ... (718 more lines)