Java ChannelHandlerContext.setAttachment方法代碼示例

import org.jboss.netty.channel.ChannelHandlerContext; //導入方法依賴的package包/類
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
	Object msg = e.getMessage();
	if (!(msg instanceof RpcRequest)) {
		logger.error("not RpcRequest received!");
		return;
	}
	RpcRequest request = (RpcRequest) msg;
	ctx.setAttachment(request);

	RpcResponse response = new RpcResponse(request.getRequestID());
	try {
		Object result = handle(request);
		response.setResult(result);
	} catch (Throwable t) {
		logger.error("handle rpc request fail! request:"+request, t);
		response.setException(t);
	}
	e.getChannel().write(response);
}
 

import org.jboss.netty.channel.ChannelHandlerContext; //導入方法依賴的package包/類
@Override
public void channelConnected(ChannelHandlerContext ctx,
        ChannelStateEvent e) throws Exception
{
    if (LOG.isTraceEnabled()) {
        LOG.trace("Channel connected " + e);
    }

    NettyServerCnxn cnxn = new NettyServerCnxn(ctx.getChannel(),
            zkServer, NettyServerCnxnFactory.this);
    ctx.setAttachment(cnxn);

    if (secure) {
        SslHandler sslHandler = ctx.getPipeline().get(SslHandler.class);
        ChannelFuture handshakeFuture = sslHandler.handshake();
        handshakeFuture.addListener(new CertificateVerifier(sslHandler, cnxn));
    } else {
        allChannels.add(ctx.getChannel());
        addCnxn(cnxn);
    }
}
 

import org.jboss.netty.channel.ChannelHandlerContext; //導入方法依賴的package包/類
@Override
public void channelConnected(ChannelHandlerContext ctx,
        ChannelStateEvent e) throws Exception
{
    if (LOG.isTraceEnabled()) {
        LOG.trace("Channel connected " + e);
    }
    allChannels.add(ctx.getChannel());
    NettyServerCnxn cnxn = new NettyServerCnxn(ctx.getChannel(),
            zkServer, NettyServerCnxnFactory.this);
    ctx.setAttachment(cnxn);
    addCnxn(cnxn);
}
 

import org.jboss.netty.channel.ChannelHandlerContext; //導入方法依賴的package包/類
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel,
        ChannelBuffer buffer) throws Exception {
    log.debug("Message received.");
    if (!channel.isConnected()) {
        log.info("Channel is not connected.");
        // In testing, I see decode being called AFTER decode last.
        // This check avoids that from reading corrupted frames
        return null;
    }

    HexDump.pcepHexDump(buffer);

    // Buffer can contain multiple messages, also may contain out of bound message.
    // Read the message one by one from buffer and parse it. If it encountered out of bound message,
    // then mark the reader index and again take the next chunk of messages from the channel
    // and parse again from the marked reader index.
    PcepMessageReader<PcepMessage> reader = PcepFactories.getGenericReader();
    List<PcepMessage> msgList = (List<PcepMessage>) ctx.getAttachment();

    if (msgList == null) {
        msgList = new LinkedList<>();
    }

    try {
        while (buffer.readableBytes() > 0) {
            buffer.markReaderIndex();
            PcepMessage message = reader.readFrom(buffer);
            msgList.add(message);
        }
        ctx.setAttachment(null);
        return msgList;
    } catch (PcepOutOfBoundMessageException e) {
        log.debug("PCEP message decode error");
        buffer.resetReaderIndex();
        buffer.discardReadBytes();
        ctx.setAttachment(msgList);
    }
    return null;
}
 

import org.jboss.netty.channel.ChannelHandlerContext; //導入方法依賴的package包/類
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception {
    log.debug("MESSAGE IS RECEIVED.");
    if (!channel.isConnected()) {
        log.info("Channel is not connected.");
        return null;
    }

    HexDump.dump(buffer);

    BgpMessageReader<BgpMessage> reader = BgpFactories.getGenericReader();
    List<BgpMessage> msgList = (List<BgpMessage>) ctx.getAttachment();

    if (msgList == null) {
        msgList = new LinkedList<>();
    }

    try {
        while (buffer.readableBytes() > 0) {
            buffer.markReaderIndex();
            BgpHeader bgpHeader = new BgpHeader();
            BgpMessage message = reader.readFrom(buffer, bgpHeader);
            msgList.add(message);
        }

        return msgList;
    } catch (Exception e) {
        log.debug("Bgp protocol message decode error");
        buffer.resetReaderIndex();
        buffer.discardReadBytes();
        ctx.setAttachment(msgList);
    }
    return null;
}