Example usage for io.netty.buffer ByteBuf isReadable

List of usage examples for io.netty.buffer ByteBuf isReadable

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Introduction

In this page you can find the example usage for io.netty.buffer ByteBuf isReadable.

Prototype

public abstract boolean isReadable();

Source Link

Document

Returns true if and only if (this.writerIndex - this.readerIndex) is greater than 0 .

Usage

From source file:code.google.nfs.rpc.netty.serialize.NettyProtocolDecoder.java

License:Apache License

/**
 * Called once data should be decoded from the given {@link ByteBuf}. This method will call
 * {@link #decode(ChannelHandlerContext, ByteBuf, List)} as long as decoding should take place.
 *
 * @param ctx           the {@link ChannelHandlerContext} which this {@link ByteToMessageDecoder} belongs to
 * @param in            the {@link ByteBuf} from which to read data
 * @param out           the {@link List} to which decoded messages should be added
 *//*from  w ww .j  a  v a2s  .c om*/
protected void callDecode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
    try {
        while (in.isReadable()) {
            int outSize = out.size();
            int oldInputLength = in.readableBytes();
            decode(ctx, in, out);

            // Check if this handler was removed before try to continue the loop.
            // If it was removed it is not safe to continue to operate on the buffer
            //
            // See https://github.com/netty/netty/issues/1664
            if (ctx.isRemoved()) {
                break;
            }

            if (outSize == out.size()) {
                if (oldInputLength == in.readableBytes()) {
                    break;
                } else {
                    continue;
                }
            }

            if (oldInputLength == in.readableBytes()) {
                throw new DecoderException(StringUtil.simpleClassName(getClass())
                        + ".decode() did not read anything but decoded a message.");
            }

            if (isSingleDecode()) {
                break;
            }
        }
    } catch (DecoderException e) {
        throw e;
    } catch (Throwable cause) {
        throw new DecoderException(cause);
    }
}

From source file:com.bala.learning.learning.netty.HttpServerHandler.java

License:Apache License

@Override
protected void channelRead0(ChannelHandlerContext ctx, Object msg) {
    if (msg instanceof HttpRequest) {
        HttpRequest request = this.request = (HttpRequest) msg;

        if (HttpHeaders.is100ContinueExpected(request)) {
            send100Continue(ctx);//from  w ww  .j  a va  2s. c  om
        }

        buf.setLength(0);
        buf.append("WELCOME TO THE WILD WILD WEB SERVER\r\n");
        buf.append("===================================\r\n");

        buf.append("VERSION: ").append(request.getProtocolVersion()).append("\r\n");
        buf.append("HOSTNAME: ").append(HttpHeaders.getHost(request, "unknown")).append("\r\n");
        buf.append("REQUEST_URI: ").append(request.getUri()).append("\r\n\r\n");

        HttpHeaders headers = request.headers();
        if (!headers.isEmpty()) {
            for (Map.Entry<String, String> h : headers) {
                String key = h.getKey();
                String value = h.getValue();
                buf.append("HEADER: ").append(key).append(" = ").append(value).append("\r\n");
            }
            buf.append("\r\n");
        }

        QueryStringDecoder queryStringDecoder = new QueryStringDecoder(request.getUri());
        Map<String, List<String>> params = queryStringDecoder.parameters();
        if (!params.isEmpty()) {
            for (Entry<String, List<String>> p : params.entrySet()) {
                String key = p.getKey();
                List<String> vals = p.getValue();
                for (String val : vals) {
                    buf.append("PARAM: ").append(key).append(" = ").append(val).append("\r\n");
                }
            }
            buf.append("\r\n");
        }

        appendDecoderResult(buf, request);
    }

    if (msg instanceof HttpContent) {
        HttpContent httpContent = (HttpContent) msg;

        ByteBuf content = httpContent.content();
        if (content.isReadable()) {
            buf.append("CONTENT: ");
            buf.append(content.toString(CharsetUtil.UTF_8));
            buf.append("\r\n");
            appendDecoderResult(buf, request);
        }

        if (msg instanceof LastHttpContent) {
            buf.append("END OF CONTENT\r\n");

            LastHttpContent trailer = (LastHttpContent) msg;
            if (!trailer.trailingHeaders().isEmpty()) {
                buf.append("\r\n");
                for (String name : trailer.trailingHeaders().names()) {
                    for (String value : trailer.trailingHeaders().getAll(name)) {
                        buf.append("TRAILING HEADER: ");
                        buf.append(name).append(" = ").append(value).append("\r\n");
                    }
                }
                buf.append("\r\n");
            }

            if (!writeResponse(trailer, ctx)) {
                // If keep-alive is off, close the connection once the content is fully written.
                ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
            }
        }
    }
}

From source file:com.blogspot.jabelarminecraft.blocksmith.proxy.CommonProxy.java

License:Open Source License

public List<ItemStack> convertPayloadToItemStackList(ByteBuf theBuffer) {
    List<ItemStack> theList = new ArrayList();

    while (theBuffer.isReadable()) {
        int theID = theBuffer.readInt();
        int theMetadata = theBuffer.readInt();
        ItemStack theStack = new ItemStack(Item.getItemById(theID), 1, theMetadata);

        // Handle the case of mods like Tinker's Construct that use NBT instead of metadata
        boolean hasNBT = theBuffer.readBoolean();
        if (hasNBT) {
            theStack.setTagCompound(ByteBufUtils.readTag(theBuffer));
            // DEBUG
            System.out.println(//from   w w  w .j  a v a 2  s .  com
                    "The stack " + theStack.toString() + " has NBT = " + theStack.getTagCompound().toString());
        }

        theList.add(theStack);
    }

    // DEBUG
    System.out.println(theList.toString());

    return theList;
}

From source file:com.butor.netty.handler.codec.ftp.CrlfStringDecoder.java

License:Apache License

/**
 * {@inheritDoc}/*  ww w  .  ja v  a  2 s.  co m*/
 */
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf cb, List<Object> out) throws Exception {
    byte[] data = new byte[maxRequestLengthBytes];
    int lineLength = 0;
    while (cb.isReadable()) {
        byte nextByte = cb.readByte();
        if (nextByte == CR) {
            nextByte = cb.readByte();
            if (nextByte == LF) {
                out.add(new String(data, encoding));
            }
        } else if (nextByte == LF) {
            out.add(new String(data, encoding));
        } else {
            if (lineLength >= maxRequestLengthBytes)
                throw new IllegalArgumentException(
                        "Request size threshold exceeded: [" + maxRequestLengthBytes + "]");
            data[lineLength] = nextByte;
            lineLength += 1;
        }
    }
}

From source file:com.cdg.study.netty.discard.DiscardServerHandler.java

License:Open Source License

@Override
public void channelRead(ChannelHandlerContext context, Object msg) { // Netty? ?? 
    ByteBuf buf = (ByteBuf) msg; // ??   ?? ?
    try {//from   w  ww  .  jav a2  s .  c  o m
        while (buf.isReadable()) { // (1)
            System.out.print((char) buf.readByte());
            System.out.flush();
        }
    } finally {
        buf.release(); //  ?  ? 
    }
}

From source file:com.chat.common.netty.handler.decode.ProtobufVarint32FrameDecoder.java

License:Apache License

/**
 * Reads variable length 32bit int from buffer
 *
 * @return decoded int if buffers readerIndex has been forwarded else nonsense value
 *//*from   www  .  j av  a2  s.co m*/
private static int readRawVarint32(ByteBuf buffer) {
    if (!buffer.isReadable()) {
        return 0;
    }
    buffer.markReaderIndex();
    byte tmp = buffer.readByte();
    if (tmp >= 0) {
        return tmp;
    } else {
        int result = tmp & 127;
        if (!buffer.isReadable()) {
            buffer.resetReaderIndex();
            return 0;
        }
        if ((tmp = buffer.readByte()) >= 0) {
            result |= tmp << 7;
        } else {
            result |= (tmp & 127) << 7;
            if (!buffer.isReadable()) {
                buffer.resetReaderIndex();
                return 0;
            }
            if ((tmp = buffer.readByte()) >= 0) {
                result |= tmp << 14;
            } else {
                result |= (tmp & 127) << 14;
                if (!buffer.isReadable()) {
                    buffer.resetReaderIndex();
                    return 0;
                }
                if ((tmp = buffer.readByte()) >= 0) {
                    result |= tmp << 21;
                } else {
                    result |= (tmp & 127) << 21;
                    if (!buffer.isReadable()) {
                        buffer.resetReaderIndex();
                        return 0;
                    }
                    result |= (tmp = buffer.readByte()) << 28;
                    if (tmp < 0) {
                        throw new CorruptedFrameException("malformed varint.");
                    }
                }
            }
        }
        return result;
    }
}

From source file:com.chen.opensourceframework.netty.copy.DiscardServerHandler.java

License:Apache License

@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) { // (2)
    ByteBuf in = (ByteBuf) msg;
    try {/*w  ww.  j a v a2  s . c o  m*/
        while (in.isReadable()) { // (1)
            System.out.print((char) in.readByte());
            System.out.flush();
        }
    } finally {
        ReferenceCountUtil.release(msg); // (2)
    }
    //
    //        System.out.println("?:...");
    //        ctx.write(msg); // (1)
    //        ctx.flush(); // (2)
}

From source file:com.chen.opensourceframework.netty.discard.DiscardServerHandler.java

License:Apache License

@Override
public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
    // discard//from w  w  w  . j  a v  a  2  s.c  o  m
    ByteBuf in = (ByteBuf) msg;
    try {
        while (in.isReadable()) { // (1)
            System.out.print((char) in.readChar());
            System.out.flush();
        }
    } finally {
        ReferenceCountUtil.release(msg); // (2)
    }
}

From source file:com.chen.opensourceframework.netty.echo.EchoServerHandler.java

License:Apache License

@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
    //        ctx.write(msg);
    ByteBuf in = (ByteBuf) msg;
    try {//from w  ww. j a v  a 2s  . co  m
        while (in.isReadable()) { // (1)
            System.out.print(in.readChar());
            System.out.flush();
        }
    } finally {
        ReferenceCountUtil.release(msg); // (2)
    }
}

From source file:com.chiorichan.factory.FileInterpreter.java

License:Mozilla Public License

public static String readLine(ByteBuf buf) {
    if (!buf.isReadable() || buf.readableBytes() < 1)
        return null;

    String op = "";
    while (buf.isReadable() && buf.readableBytes() > 0) {
        byte bb = buf.readByte();
        if (bb == '\n')
            break;
        op += (char) bb;
    }//from  w  w w  .j a  v  a 2 s . com
    return op;
}