netty源代码分析

这篇文章（http://san-yun.iteye.com/blog/1689608）分析了部分netty代码，下面我对netty的核心类做了记录：

DefaultChannelPipeline
    public void sendUpstream(ChannelEvent e);
    public void sendDownstream(ChannelEvent e){
        try {
            ((ChannelDownstreamHandler) ctx.getHandler()).handleDownstream(ctx, e);
        } catch (Throwable t) {
            notifyHandlerException(e, t);
        }
    }

SimpleChannelHandler
    public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e){
         if (e instanceof MessageEvent) {
            messageReceived(ctx, (MessageEvent) e);
        } else if (e instanceof WriteCompletionEvent) {
            WriteCompletionEvent evt = (WriteCompletionEvent) e;
            writeComplete(ctx, evt);
        } else if (e instanceof ChildChannelStateEvent) {
            ChildChannelStateEvent evt = (ChildChannelStateEvent) e;
            if (evt.getChildChannel().isOpen()) {
                childChannelOpen(ctx, evt);
            } else {
                childChannelClosed(ctx, evt);
            }
        }else if (e instanceof ExceptionEvent) {
            exceptionCaught(ctx, (ExceptionEvent) e);
        } else {
            ctx.sendUpstream(e);
        }
    }
     public void handleDownstream(ChannelHandlerContext ctx, ChannelEvent e)
            throws Exception {

        if (e instanceof MessageEvent) {
            writeRequested(ctx, (MessageEvent) e);
        } else if (e instanceof ChannelStateEvent) {
            //省略细节代码....         
        } else {
            ctx.sendDownstream(e);
        }


Channels.write()
    1.DefaultChannelPipeline.sendDownstream(e);
    2.SimpleChannelHandler.handleDownstream(e);
    3.SimpleChannelHandler.writeRequested(ctx,e);
    4.OioServerSocketPipelineSink.eventSunk(pipeline,e);
    5.OioServerSocketPipelineSink.handleAcceptedSocket(e);
    6.OioWorker.write(channel, future, message)

MessageEvent
    DownstreamMessageEvent
    UpstreamMessageEvent