Examples of io.netty.buffer.ByteBuf.duplicate()

io.netty.buffer.ByteBuf.duplicate()
Returns a buffer which shares the whole region of this buffer. Modifying the content of the returned buffer or this buffer affects each other's content while they maintain separate indexes and marks. This method is identical to {@code buf.slice(0, buf.capacity())}. This method does not modify {@code readerIndex} or {@code writerIndex} ofthis buffer.

            public ByteBuf readChunk(ChannelHandlerContext ctx) throws Exception {
                if (done) {
                    return null;
                }
                done = true;
                return buffer.duplicate().retain();
            }


            @Override
            public long length() {
                return -1;

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        channel.config().setWriteBufferLowWaterMark(1);
        channel.config().setWriteBufferHighWaterMark(3);


        ByteBuf[] buffers = new ByteBuf[count];
        for (int i = 0; i < buffers.length; i++) {
            buffers[i] = buffer.duplicate().retain();
        }
        Assert.assertTrue(channel.writeOutbound(buffers));
        Assert.assertTrue(channel.finish());
        channel.closeFuture().syncUninterruptibly();

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    private static void assertWriteFails(ChannelHandler handler, int count) {
        final ByteBuf buffer = Unpooled.copiedBuffer("Test", CharsetUtil.US_ASCII);
        final EmbeddedChannel channel = new EmbeddedChannel(handler);
        ByteBuf[] buffers = new ByteBuf[count];
        for (int i = 0; i < buffers.length; i++) {
            buffers[i] = buffer.duplicate().retain();
        }
        try {
            Assert.assertFalse(channel.writeOutbound(buffers));
            Assert.fail();
        } catch (Exception e) {

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        MemoryFileUpload upload = new MemoryFileUpload(getName(), getFilename(), getContentType(),
                getContentTransferEncoding(), getCharset(), size);
        ByteBuf buf = content();
        if (buf != null) {
            try {
                upload.setContent(buf.duplicate());
                return upload;
            } catch (IOException e) {
                throw new ChannelException(e);
            }
        }

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        DiskFileUpload upload = new DiskFileUpload(getName(),
                getFilename(), getContentType(), getContentTransferEncoding(), getCharset(), size);
        ByteBuf buf = content();
        if (buf != null) {
            try {
                upload.setContent(buf.duplicate());
            } catch (IOException e) {
                throw new ChannelException(e);
            }
        }
        return upload;

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