Example usage for io.netty.buffer Unpooled EMPTY_BUFFER

Introduction

In this page you can find the example usage for io.netty.buffer Unpooled EMPTY_BUFFER.

Prototype

ByteBuf EMPTY_BUFFER

To view the source code for io.netty.buffer Unpooled EMPTY_BUFFER.

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Document

A buffer whose capacity is 0 .

Usage

From source file:NettyInboundHttpTargetHandler.java

License:Apache License

@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
    //  System.out.println("Activating Chanel");
    ctx.read();//from   ww w .  jav  a2  s .  c o m
    ctx.write(Unpooled.EMPTY_BUFFER);
}

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From source file:NettyHttpTransportSourceHandler.java

License:Apache License

/**
 * Closes the specified channel after all queued write requests are flushed.
 *///from  ww  w . j  a v  a2  s.  c o m
static void closeOnFlush(Channel ch) {
    if (ch.isActive()) {
        ch.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
    }
}

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From source file:at.yawk.accordion.distributed.HeartbeatManager.java

License:Mozilla Public License

/**
 * Send a heartbeat to all connected servers and check if they are still online.
 *///from   w  ww  .jav a2s  .  c o m
private void beat() {
    connectionManager.getConnections().forEach(connection -> {
        // send heartbeat
        try {
            connectionManager.sendPacket(InternalProtocol.HEARTBEAT_BYTES, Stream.of(connection),
                    Unpooled.EMPTY_BUFFER);
        } catch (Throwable t) {
            connectionManager.getLogger().error("Failed to send heartbeat to " + connection, t);
        }
        // check for timeout
        try {
            Object lastHeartbeatObj = connection.properties().get("lastHeartbeat");
            // null if no hb packet was received yet and onConnected wasn't called for some reason.
            if (lastHeartbeatObj != null) {
                long timeSinceLastHeartbeat = System.currentTimeMillis() - (long) lastHeartbeatObj;
                if (timeSinceLastHeartbeat > TIMEOUT) {
                    // timeout
                    Log.info(connectionManager.getLogger(), () -> connection + " timed out (heartbeat)");
                    connection.disconnect();
                }
            }
        } catch (Throwable t) {
            connectionManager.getLogger().error("Failed to confirm heartbeat for " + connection, t);
        }
    });
}

---

From source file:brave.netty.http.TestHttpHandler.java

License:Apache License

private boolean writeResponse(HttpResponseStatus responseStatus, String content, ChannelHandlerContext ctx) {
    if (StringUtil.isNullOrEmpty(content)) {
        content = Unpooled.EMPTY_BUFFER.toString();
    }/* w ww  .ja  v a2  s.com*/
    // Decide whether to close the connection or not.
    boolean keepAlive = isKeepAlive(httpRequest);

    if (responseStatus == null) {
        responseStatus = httpRequest.getDecoderResult().isSuccess() ? OK : BAD_REQUEST;
    }
    // Build the response object.
    FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, responseStatus,
            Unpooled.copiedBuffer(content, CharsetUtil.UTF_8));

    response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");

    if (keepAlive) {
        // Add 'Content-Length' header only for a keep-alive connection.
        response.headers().set(CONTENT_LENGTH, response.content().readableBytes());
        // Add keep alive header as per:
        // - http://www.w3.org/Protocols/HTTP/1.1/draft-ietf-http-v11-spec-01.html#Connection
        response.headers().set(CONNECTION, Values.KEEP_ALIVE);
    }

    // Write the response.
    ctx.write(response);

    return keepAlive;
}

---

From source file:bzh.ygu.fun.chitchat.HttpChitChatServerHandler.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);//  w w  w  .  j av a2s  .c om
        }
        String uri = request.uri();
        HttpMethod method = request.method();
        Root root = Root.getInstance();
        buf.setLength(0);
        contentBuf.setLength(0);

        if (method == HttpMethod.POST) {
            if (uri.equals("/chitchat")) {

                currentAction = "Add";
            }
        }
        if (method == HttpMethod.GET) {
            if (uri.startsWith(LATEST)) {
                latestFromWho = decode(uri.substring(LATEST_SIZE));
                currentAction = "Latest";
                Message m = root.getLatest(latestFromWho);
                if (m != null) {
                    //{"author":"Iron Man", "text":"We have a Hulk !", "thread":3,"createdAt":1404736639715}
                    buf.append(m.toJSON());
                }
            }
            if (uri.startsWith(THREADCALL)) {
                currentAction = "Thread";
                String threadId = uri.substring(THREADCALL_SIZE);
                MessageThread mt = root.getMessageThread(threadId);
                if (mt != null) {
                    //{"author":"Iron Man", "text":"We have a Hulk !", "thread":3,"createdAt":1404736639715}
                    buf.append(mt.toJSON());
                }

            }
            if (uri.startsWith(SEARCH)) {
                String stringToSearch = decode(uri.substring(SEARCH_SIZE));
                currentAction = "search";
                List<Message> lm = root.search(stringToSearch);
                //[{"author":"Loki", "text":"I have an army !", "thread":3,
                //"createdAt":1404736639710}, {"author":"Iron Man", "text":"We have a Hulk !",
                //   "thread":3, "createdAt":1404736639715}]
                buf.append("[");
                if (!lm.isEmpty()) {
                    Iterator<Message> it = lm.iterator();
                    Message m = it.next();
                    buf.append(m.toJSON());
                    while (it.hasNext()) {
                        m = it.next();
                        buf.append(", ");
                        buf.append(m.toJSON());
                    }
                }

                buf.append("]");
            }
        }
    }

    if (msg instanceof HttpContent) {
        Root root = Root.getInstance();
        HttpContent httpContent = (HttpContent) msg;

        ByteBuf content = httpContent.content();
        if (content.isReadable()) {
            contentBuf.append(content.toString(CharsetUtil.UTF_8));
        }

        if (msg instanceof LastHttpContent) {
            //                buf.append("END OF CONTENT\r\n");
            if (currentAction.equals("Add")) {
                addMessageFromContent(contentBuf.toString(), root);
                currentAction = "None";
            }
            LastHttpContent trailer = (LastHttpContent) msg;

            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:cc.agentx.client.net.nio.Socks5Handler.java

License:Apache License

@Override
public void channelRead0(ChannelHandlerContext ctx, SocksRequest request) throws Exception {
    switch (request.protocolVersion()) {
    case SOCKS4a:
        log.warn("\tBad Handshake! (protocol version not supported: 4)");
        ctx.write(new SocksInitResponse(SocksAuthScheme.UNKNOWN));
        if (ctx.channel().isActive()) {
            ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
        }//ww  w .  java2s  .c o  m
        break;
    case SOCKS5:
        switch (request.requestType()) {
        case INIT:
            ctx.pipeline().addFirst(new SocksCmdRequestDecoder());
            ctx.write(new SocksInitResponse(SocksAuthScheme.NO_AUTH));
            break;
        case AUTH:
            ctx.pipeline().addFirst(new SocksCmdRequestDecoder());
            ctx.write(new SocksAuthResponse(SocksAuthStatus.SUCCESS));
            break;
        case CMD:
            if (((SocksCmdRequest) request).cmdType() == SocksCmdType.CONNECT) {
                ctx.pipeline().addLast(new XConnectHandler());
                ctx.pipeline().remove(this);
                ctx.fireChannelRead(request);
            } else {
                ctx.close();
                log.warn("\tBad Handshake! (command not support: {})", ((SocksCmdRequest) request).cmdType());
            }
            break;
        case UNKNOWN:
            log.warn("\tBad Handshake! (unknown request type)");
        }
        break;
    case UNKNOWN:
        log.warn("\tBad Handshake! (protocol version not support: {}", request.protocolVersion());
        ctx.close();
        break;
    }
}

---

From source file:cc.agentx.client.net.nio.Socks5Handler.java

License:Apache License

@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable throwable) {
    throwable.printStackTrace();/*  w ww.j  a va 2 s .c  o m*/
    if (ctx.channel().isActive()) {
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
    }
}

---

From source file:cc.agentx.client.net.nio.XConnectHandler.java

License:Apache License

@Override
public void channelRead0(final ChannelHandlerContext ctx, final SocksCmdRequest request) throws Exception {
    boolean proxyMode = isAgentXNeeded(request.host());
    log.info("\tClient -> Proxy           \tTarget {}:{} [{}]", request.host(), request.port(),
            proxyMode ? "AGENTX" : "DIRECT");
    Promise<Channel> promise = ctx.executor().newPromise();
    promise.addListener(new FutureListener<Channel>() {
        @Override//  w  w  w  .  ja va2 s.com
        public void operationComplete(final Future<Channel> future) throws Exception {
            final Channel outboundChannel = future.getNow();
            if (future.isSuccess()) {
                ctx.channel().writeAndFlush(new SocksCmdResponse(SocksCmdStatus.SUCCESS, request.addressType()))
                        .addListener(channelFuture -> {
                            ByteBuf byteBuf = Unpooled.buffer();
                            request.encodeAsByteBuf(byteBuf);
                            if (byteBuf.hasArray()) {
                                byte[] xRequestBytes = new byte[byteBuf.readableBytes()];
                                byteBuf.getBytes(0, xRequestBytes);

                                if (proxyMode) {
                                    // handshaking to remote proxy
                                    xRequestBytes = requestWrapper.wrap(xRequestBytes);
                                    outboundChannel.writeAndFlush(Unpooled.wrappedBuffer(
                                            exposeRequest ? xRequestBytes : wrapper.wrap(xRequestBytes)));
                                }

                                // task handover
                                ReferenceCountUtil.retain(request); // auto-release? a trap?
                                ctx.pipeline().remove(XConnectHandler.this);
                                outboundChannel.pipeline().addLast(new XRelayHandler(ctx.channel(),
                                        proxyMode ? wrapper : rawWrapper, false));
                                ctx.pipeline().addLast(new XRelayHandler(outboundChannel,
                                        proxyMode ? wrapper : rawWrapper, true));
                            }
                        });
            } else {
                ctx.channel()
                        .writeAndFlush(new SocksCmdResponse(SocksCmdStatus.FAILURE, request.addressType()));

                if (ctx.channel().isActive()) {
                    ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
                }
            }
        }
    });

    String host = request.host();
    int port = request.port();
    if (host.equals(config.getConsoleDomain())) {
        host = "localhost";
        port = config.getConsolePort();
    } else if (proxyMode) {
        host = config.getServerHost();
        port = config.getServerPort();
    }

    // ping target
    bootstrap.group(ctx.channel().eventLoop()).channel(NioSocketChannel.class)
            .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000).option(ChannelOption.SO_KEEPALIVE, true)
            .handler(new XPingHandler(promise, System.currentTimeMillis())).connect(host, port)
            .addListener(new ChannelFutureListener() {
                @Override
                public void operationComplete(ChannelFuture future) throws Exception {
                    if (!future.isSuccess()) {
                        ctx.channel().writeAndFlush(
                                new SocksCmdResponse(SocksCmdStatus.FAILURE, request.addressType()));
                        if (ctx.channel().isActive()) {
                            ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
                        }
                    }
                }
            });
}

---

From source file:cc.agentx.client.net.nio.XConnectHandler.java

License:Apache License

@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
    if (ctx.channel().isActive()) {
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
    }/*from  www .java  2  s  .  com*/
    log.warn("\tBad Connection! ({})", cause.getMessage());
}

---

From source file:cc.agentx.client.net.nio.XRelayHandler.java

License:Apache License

@Override
public void channelActive(ChannelHandlerContext ctx) {
    ctx.writeAndFlush(Unpooled.EMPTY_BUFFER);
}

---

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