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Netty_4_Upgrade_Notes.md

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Resources

http://netty.io/news/2013/06/18/4-0-0-CR5.html http://netty.io/4.0/api http://docs.jboss.org/netty/3.2/api/

Relevant Changes

  • ServerBootstrap no longer takes a ServerSocketChannelFactory in its constructor. We used to use this to configure the thread pools. Looks like EventLoopGroup or its relatives are the place to look.

  • Same thing as #1 is true for ClientSocketChannelFactory.

  • ChannelPipelineFactory is gone. Looks like one uses .childHandler() with a ChannelInitializer instead.

  • What's up with ThreadRenamingRunnable in DefaultHttpProxyServer?

  • DefaultChannelGroup?

  • SimpleChannelUpstreamHandler -> SimpleChannelInboundHandler

  • InterestOps is gone - what does this mean to setReadable() and channelInterestChanged() ?

  • IdleStateHandler no longer users Timer. This may be a problem, because it's just scheduling things on an EventExecutor obtained from the underlying EventLoopGroup. That infrastructure doesn't appear to use Timers at all.

  • messageReceived() -> channelRead0 with POJO typed message

  • HttpChunk -> HttpObject

  • HttpChunkAggregator -> HttpObjectAggregator

  • Channel lifecycle is different:

    • old: open -> bound -> connected
    • new: open -> registered -> active ??

  • channelOpen() -> channelRegistered() ? note that we added call to super

  • channelClosed() -> channelUnregistered() ? note that we added call to super

  • lifecycle callbacks no longer get a ChannelStateEvent. We often grabbed the channel from the event, we now grab it from the ChannelHandlerContext.

  • IdleStateAwareChannelHandler -> ChannelDuplexHandler

  • ChannelBuffer -> ByteBuf

  • Headers on HttpObject are no longer accessed directly, but first by getting the headers object using .headers()

  • ChannelBuffers -> Unpooled