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Java example source code file (PooledHeapByteBuf.java)

This example Java source code file (PooledHeapByteBuf.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytebuf, bytebuffer, closedchannelexception, filechannel, gatheringbytechannel, inputstream, ioexception, nio, outputstream, override, pooledbytebuf, pooledheapbytebuf, recycler, scatteringbytechannel, unsupportedoperationexception

The PooledHeapByteBuf.java Java example source code

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file tothe 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.internal.PlatformDependent;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;

class PooledHeapByteBuf extends PooledByteBuf<byte[]> {

    private static final Recycler<PooledHeapByteBuf> RECYCLER = new Recycler() {
        @Override
        protected PooledHeapByteBuf newObject(Handle<PooledHeapByteBuf> handle) {
            return new PooledHeapByteBuf(handle, 0);
        }
    };

    static PooledHeapByteBuf newInstance(int maxCapacity) {
        PooledHeapByteBuf buf = RECYCLER.get();
        buf.reuse(maxCapacity);
        return buf;
    }

    PooledHeapByteBuf(Recycler.Handle<? extends PooledHeapByteBuf> recyclerHandle, int maxCapacity) {
        super(recyclerHandle, maxCapacity);
    }

    @Override
    public final boolean isDirect() {
        return false;
    }

    @Override
    protected byte _getByte(int index) {
        return HeapByteBufUtil.getByte(memory, idx(index));
    }

    @Override
    protected short _getShort(int index) {
        return HeapByteBufUtil.getShort(memory, idx(index));
    }

    @Override
    protected short _getShortLE(int index) {
        return HeapByteBufUtil.getShortLE(memory, idx(index));
    }

    @Override
    protected int _getUnsignedMedium(int index) {
        return HeapByteBufUtil.getUnsignedMedium(memory, idx(index));
    }

    @Override
    protected int _getUnsignedMediumLE(int index) {
        return HeapByteBufUtil.getUnsignedMediumLE(memory, idx(index));
    }

    @Override
    protected int _getInt(int index) {
        return HeapByteBufUtil.getInt(memory, idx(index));
    }

    @Override
    protected int _getIntLE(int index) {
        return HeapByteBufUtil.getIntLE(memory, idx(index));
    }

    @Override
    protected long _getLong(int index) {
        return HeapByteBufUtil.getLong(memory, idx(index));
    }

    @Override
    protected long _getLongLE(int index) {
        return HeapByteBufUtil.getLongLE(memory, idx(index));
    }

    @Override
    public final ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
        checkDstIndex(index, length, dstIndex, dst.capacity());
        if (dst.hasMemoryAddress()) {
            PlatformDependent.copyMemory(memory, idx(index), dst.memoryAddress() + dstIndex, length);
        } else if (dst.hasArray()) {
            getBytes(index, dst.array(), dst.arrayOffset() + dstIndex, length);
        } else {
            dst.setBytes(dstIndex, memory, idx(index), length);
        }
        return this;
    }

    @Override
    public final ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
        checkDstIndex(index, length, dstIndex, dst.length);
        System.arraycopy(memory, idx(index), dst, dstIndex, length);
        return this;
    }

    @Override
    public final ByteBuf getBytes(int index, ByteBuffer dst) {
        checkIndex(index);
        dst.put(memory, idx(index), Math.min(capacity() - index, dst.remaining()));
        return this;
    }

    @Override
    public final ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
        checkIndex(index, length);
        out.write(memory, idx(index), length);
        return this;
    }

    @Override
    public final int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
        return getBytes(index, out, length, false);
    }

    private int getBytes(int index, GatheringByteChannel out, int length, boolean internal) throws IOException {
        checkIndex(index, length);
        index = idx(index);
        ByteBuffer tmpBuf;
        if (internal) {
            tmpBuf = internalNioBuffer();
        } else {
            tmpBuf = ByteBuffer.wrap(memory);
        }
        return out.write((ByteBuffer) tmpBuf.clear().position(index).limit(index + length));
    }

    @Override
    public final int getBytes(int index, FileChannel out, long position, int length) throws IOException {
        return getBytes(index, out, position, length, false);
    }

    private int getBytes(int index, FileChannel out, long position, int length, boolean internal) throws IOException {
        checkIndex(index, length);
        index = idx(index);
        ByteBuffer tmpBuf = internal ? internalNioBuffer() : ByteBuffer.wrap(memory);
        return out.write((ByteBuffer) tmpBuf.clear().position(index).limit(index + length), position);
    }

    @Override
    public final int readBytes(GatheringByteChannel out, int length) throws IOException {
        checkReadableBytes(length);
        int readBytes = getBytes(readerIndex, out, length, true);
        readerIndex += readBytes;
        return readBytes;
    }

    @Override
    public final int readBytes(FileChannel out, long position, int length) throws IOException {
        checkReadableBytes(length);
        int readBytes = getBytes(readerIndex, out, position, length, true);
        readerIndex += readBytes;
        return readBytes;
    }

    @Override
    protected void _setByte(int index, int value) {
        HeapByteBufUtil.setByte(memory, idx(index), value);
    }

    @Override
    protected void _setShort(int index, int value) {
        HeapByteBufUtil.setShort(memory, idx(index), value);
    }

    @Override
    protected void _setShortLE(int index, int value) {
        HeapByteBufUtil.setShortLE(memory, idx(index), value);
    }

    @Override
    protected void _setMedium(int index, int   value) {
        HeapByteBufUtil.setMedium(memory, idx(index), value);
    }

    @Override
    protected void _setMediumLE(int index, int value) {
        HeapByteBufUtil.setMediumLE(memory, idx(index), value);
    }

    @Override
    protected void _setInt(int index, int   value) {
        HeapByteBufUtil.setInt(memory, idx(index), value);
    }

    @Override
    protected void _setIntLE(int index, int value) {
        HeapByteBufUtil.setIntLE(memory, idx(index), value);
    }

    @Override
    protected void _setLong(int index, long  value) {
        HeapByteBufUtil.setLong(memory, idx(index), value);
    }

    @Override
    protected void _setLongLE(int index, long value) {
        HeapByteBufUtil.setLongLE(memory, idx(index), value);
    }

    @Override
    public final ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
        checkSrcIndex(index, length, srcIndex, src.capacity());
        if (src.hasMemoryAddress()) {
            PlatformDependent.copyMemory(src.memoryAddress() + srcIndex, memory, idx(index), length);
        } else if (src.hasArray()) {
            setBytes(index, src.array(), src.arrayOffset() + srcIndex, length);
        } else {
            src.getBytes(srcIndex, memory, idx(index), length);
        }
        return this;
    }

    @Override
    public final ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
        checkSrcIndex(index, length, srcIndex, src.length);
        System.arraycopy(src, srcIndex, memory, idx(index), length);
        return this;
    }

    @Override
    public final ByteBuf setBytes(int index, ByteBuffer src) {
        int length = src.remaining();
        checkIndex(index, length);
        src.get(memory, idx(index), length);
        return this;
    }

    @Override
    public final int setBytes(int index, InputStream in, int length) throws IOException {
        checkIndex(index, length);
        return in.read(memory, idx(index), length);
    }

    @Override
    public final int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
        checkIndex(index, length);
        index = idx(index);
        try {
            return in.read((ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length));
        } catch (ClosedChannelException ignored) {
            return -1;
        }
    }

    @Override
    public final int setBytes(int index, FileChannel in, long position, int length) throws IOException {
        checkIndex(index, length);
        index = idx(index);
        try {
            return in.read((ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length), position);
        } catch (ClosedChannelException ignored) {
            return -1;
        }
    }

    @Override
    public final ByteBuf copy(int index, int length) {
        checkIndex(index, length);
        ByteBuf copy = alloc().heapBuffer(length, maxCapacity());
        copy.writeBytes(memory, idx(index), length);
        return copy;
    }

    @Override
    public final int nioBufferCount() {
        return 1;
    }

    @Override
    public final ByteBuffer[] nioBuffers(int index, int length) {
        return new ByteBuffer[] { nioBuffer(index, length) };
    }

    @Override
    public final ByteBuffer nioBuffer(int index, int length) {
        checkIndex(index, length);
        index = idx(index);
        ByteBuffer buf =  ByteBuffer.wrap(memory, index, length);
        return buf.slice();
    }

    @Override
    public final ByteBuffer internalNioBuffer(int index, int length) {
        checkIndex(index, length);
        index = idx(index);
        return (ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length);
    }

    @Override
    public final boolean hasArray() {
        return true;
    }

    @Override
    public final byte[] array() {
        ensureAccessible();
        return memory;
    }

    @Override
    public final int arrayOffset() {
        return offset;
    }

    @Override
    public final boolean hasMemoryAddress() {
        return false;
    }

    @Override
    public final long memoryAddress() {
        throw new UnsupportedOperationException();
    }

    @Override
    protected final ByteBuffer newInternalNioBuffer(byte[] memory) {
        return ByteBuffer.wrap(memory);
    }
}

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