Examples of io.netty.channel.ReceiveBufferSizePredictor

io.netty.channel.ReceiveBufferSizePredictor
Predicts the number of readable bytes in the receive buffer of a {@link Channel}.
It calculates the close-to-optimal capacity of the {@link ChannelBuffer}for the next read operation depending on the actual number of read bytes in the previous read operation. More accurate the prediction is, more effective the memory utilization will be.
Once a read operation is performed and the actual number of read bytes is known, an I/O thread will call {@link #previousReceiveBufferSize(int)} toupdate the predictor so it can predict more accurately next time.

        }
    }


    @Override
    public ReceiveBufferSizePredictor getReceiveBufferSizePredictor() {
        ReceiveBufferSizePredictor predictor = this.predictor;
        if (predictor == null) {
            try {
                this.predictor = predictor = getReceiveBufferSizePredictorFactory().getPredictor();
            } catch (Exception e) {
                throw new ChannelException(

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    @Override
    protected boolean read(SelectionKey k) {
        final SocketChannel ch = (SocketChannel) k.channel();
        final NioSocketChannel channel = (NioSocketChannel) k.attachment();


        final ReceiveBufferSizePredictor predictor =
            channel.getConfig().getReceiveBufferSizePredictor();
        final int predictedRecvBufSize = predictor.nextReceiveBufferSize();


        int ret = 0;
        int readBytes = 0;
        boolean failure = true;


        ByteBuffer bb = recvBufferPool.acquire(predictedRecvBufSize);
        try {
            while ((ret = ch.read(bb)) > 0) {
                readBytes += ret;
                if (!bb.hasRemaining()) {
                    break;
                }
            }
            failure = false;
        } catch (ClosedChannelException e) {
            // Can happen, and does not need a user attention.
        } catch (Throwable t) {
            fireExceptionCaught(channel, t);
        }


        if (readBytes > 0) {
            bb.flip();


            final ChannelBufferFactory bufferFactory =
                channel.getConfig().getBufferFactory();
            final ChannelBuffer buffer = bufferFactory.getBuffer(readBytes);
            buffer.setBytes(0, bb);
            buffer.writerIndex(readBytes);


            recvBufferPool.release(bb);


            // Update the predictor.
            predictor.previousReceiveBufferSize(readBytes);


            // Fire the event.
            fireMessageReceived(channel, buffer);
        } else {
            recvBufferPool.release(bb);

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    }


    @Override
    protected boolean read(final SelectionKey key) {
        final NioDatagramChannel channel = (NioDatagramChannel) key.attachment();
        ReceiveBufferSizePredictor predictor =
            channel.getConfig().getReceiveBufferSizePredictor();
        final ChannelBufferFactory bufferFactory = channel.getConfig().getBufferFactory();
        final DatagramChannel nioChannel = (DatagramChannel) key.channel();


        // Allocating a non-direct buffer with a max udp packge size.
        // Would using a direct buffer be more efficient or would this negatively
        // effect performance, as direct buffer allocation has a higher upfront cost
        // where as a ByteBuffer is heap allocated.
        final ByteBuffer byteBuffer = ByteBuffer.allocate(
                predictor.nextReceiveBufferSize()).order(bufferFactory.getDefaultOrder());


        boolean failure = true;
        SocketAddress remoteAddress = null;
        try {
            // Receive from the channel in a non blocking mode. We have already been notified that
            // the channel is ready to receive.
            remoteAddress = nioChannel.receive(byteBuffer);
            failure = false;
        } catch (ClosedChannelException e) {
            // Can happen, and does not need a user attention.
        } catch (Throwable t) {
            fireExceptionCaught(channel, t);
        }


        if (remoteAddress != null) {
            // Flip the buffer so that we can wrap it.
            byteBuffer.flip();


            int readBytes = byteBuffer.remaining();
            if (readBytes > 0) {
                // Update the predictor.
                predictor.previousReceiveBufferSize(readBytes);


                // Notify the interested parties about the newly arrived message.
                fireMessageReceived(
                        channel, bufferFactory.getBuffer(byteBuffer), remoteAddress);
            }

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    @Override
    boolean process() throws IOException {


        ReceiveBufferSizePredictor predictor =
            channel.getConfig().getReceiveBufferSizePredictor();


        byte[] buf = new byte[predictor.nextReceiveBufferSize()];
        DatagramPacket packet = new DatagramPacket(buf, buf.length);
        try {
            channel.socket.receive(packet);
        } catch (InterruptedIOException e) {
            // Can happen on interruption.

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        this.writeSpinCount = writeSpinCount;
    }


    @Override
    public ReceiveBufferSizePredictor getReceiveBufferSizePredictor() {
        ReceiveBufferSizePredictor predictor = this.predictor;
        if (predictor == null) {
            try {
                this.predictor = predictor = getReceiveBufferSizePredictorFactory().getPredictor();
            } catch (Exception e) {
                throw new ChannelException(

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    }


    private boolean read(SelectionKey k) {
        final SctpChannelImpl channel = (SctpChannelImpl) k.attachment();


        final ReceiveBufferSizePredictor predictor =
                channel.getConfig().getReceiveBufferSizePredictor();
        final int predictedRecvBufSize = predictor.nextReceiveBufferSize();


        boolean messageReceived = false;
        boolean failure = true;
        MessageInfo messageInfo = null;


        ByteBuffer bb = recvBufferPool.acquire(predictedRecvBufSize);
        try {
            messageInfo = channel.channel.receive(bb, null, notificationHandler);
            if (messageInfo != null) {
                messageReceived = true;
                if (!messageInfo.isUnordered()) {
                    failure = false;
                } else {
                    if (logger.isErrorEnabled()) {
                        logger.error("Received unordered SCTP Packet");
                    }
                    failure = true;
                }
            } else {
                messageReceived = false;
                failure = false;
            }
        } catch (ClosedChannelException e) {
            // Can happen, and does not need a user attention.
        } catch (Throwable t) {
            fireExceptionCaught(channel, t);
        }


        if (messageReceived) {
            bb.flip();


            final ChannelBufferFactory bufferFactory =
                    channel.getConfig().getBufferFactory();
            final int receivedBytes = bb.remaining();
            final ChannelBuffer buffer = bufferFactory.getBuffer(receivedBytes);
            buffer.setBytes(0, bb);
            buffer.writerIndex(receivedBytes);


            recvBufferPool.release(bb);


            // Update the predictor.
            predictor.previousReceiveBufferSize(receivedBytes);


            // Fire the event.
            fireMessageReceived(channel,
                    new SctpFrame(messageInfo, buffer),
                    messageInfo.address());

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        this.writeSpinCount = writeSpinCount;
    }


    @Override
    public ReceiveBufferSizePredictor getReceiveBufferSizePredictor() {
        ReceiveBufferSizePredictor predictor = this.predictor;
        if (predictor == null) {
            try {
                this.predictor = predictor = getReceiveBufferSizePredictorFactory().getPredictor();
            } catch (Exception e) {
                throw new ChannelException(

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Related Classes of io.netty.channel.ReceiveBufferSizePredictor

io.netty.channel.sctp.DefaultNioSctpChannelConfig

io.netty.channel.sctp.SctpWorker

io.netty.channel.socket.DefaultDatagramChannelConfig

io.netty.channel.socket.nio.DefaultNioSocketChannelConfig

io.netty.channel.socket.nio.NioDatagramWorker

io.netty.channel.socket.nio.NioWorker

io.netty.channel.socket.oio.OioDatagramWorker

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