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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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:
 *
 *   http://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.Recycler;
import io.netty.util.Recycler.Handle;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

abstract class PooledByteBuf extends AbstractReferenceCountedByteBuf {

    private final Recycler.Handle> recyclerHandle;

    protected PoolChunk chunk;
    protected long handle;
    protected T memory;
    protected int offset;
    protected int length;
    int maxLength;
    PoolThreadCache cache;
    private ByteBuffer tmpNioBuf;
    private ByteBufAllocator allocator;

    @SuppressWarnings("unchecked")
    protected PooledByteBuf(Recycler.Handle> recyclerHandle, int maxCapacity) {
        super(maxCapacity);
        this.recyclerHandle = (Handle>) recyclerHandle;
    }

    void init(PoolChunk chunk, long handle, int offset, int length, int maxLength, PoolThreadCache cache) {
        init0(chunk, handle, offset, length, maxLength, cache);
    }

    void initUnpooled(PoolChunk chunk, int length) {
        init0(chunk, 0, chunk.offset, length, length, null);
    }

    private void init0(PoolChunk chunk, long handle, int offset, int length, int maxLength, PoolThreadCache cache) {
        assert handle >= 0;
        assert chunk != null;

        this.chunk = chunk;
        memory = chunk.memory;
        allocator = chunk.arena.parent;
        this.cache = cache;
        this.handle = handle;
        this.offset = offset;
        this.length = length;
        this.maxLength = maxLength;
        tmpNioBuf = null;
    }

    /**
     * Method must be called before reuse this {@link PooledByteBufAllocator}
     */
    final void reuse(int maxCapacity) {
        maxCapacity(maxCapacity);
        setRefCnt(1);
        setIndex0(0, 0);
        discardMarks();
    }

    @Override
    public final int capacity() {
        return length;
    }

    @Override
    public final ByteBuf capacity(int newCapacity) {
        checkNewCapacity(newCapacity);

        // If the request capacity does not require reallocation, just update the length of the memory.
        if (chunk.unpooled) {
            if (newCapacity == length) {
                return this;
            }
        } else {
            if (newCapacity > length) {
                if (newCapacity <= maxLength) {
                    length = newCapacity;
                    return this;
                }
            } else if (newCapacity < length) {
                if (newCapacity > maxLength >>> 1) {
                    if (maxLength <= 512) {
                        if (newCapacity > maxLength - 16) {
                            length = newCapacity;
                            setIndex(Math.min(readerIndex(), newCapacity), Math.min(writerIndex(), newCapacity));
                            return this;
                        }
                    } else { // > 512 (i.e. >= 1024)
                        length = newCapacity;
                        setIndex(Math.min(readerIndex(), newCapacity), Math.min(writerIndex(), newCapacity));
                        return this;
                    }
                }
            } else {
                return this;
            }
        }

        // Reallocation required.
        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);
        }
        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;
            tmpNioBuf = null;
            chunk.arena.free(chunk, handle, maxLength, cache);
            chunk = null;
            recycle();
        }
    }

    private void recycle() {
        recyclerHandle.recycle(this);
    }

    protected final int idx(int index) {
        return offset + index;
    }
}