Netty中的Channel.messageReceived事件

Question

In a TCP based server-client model using Netty Channels , is there any correspondence between the number of Channel.write() from the server and the corresponding Channel.messageReceived() on the receiving client ? If I do a 10 writes() on the sender , does it mean the messageReceived() will be invoked 10 times on the listening client ? or Netty can aggregate the sent data ( from the write() s on the sender ) into more or less number of messageReceived() events on the client ? Is there a way to configure this behaviour in Netty ?

Answer 1

Its not guaranteed that you have a 1:1 mapping for your Channel.write(..) and messageReceived calls. You need to use some FrameDecoder subclass (maybe write your own) which will buffer the ChannelBuffer until you receive enough data to dispatch your message to the next ChannelHandlers in the ChannelPipeline on the Server.

Netty already ships with some ready to use FrameDecoder implementations like The DelimiterBasedFrameDecoder (for example) which will take care to buffer the data until it receive a Delimiter and then dispatch it to the next handlers in the ChannelPipeline.

See [1] for more details.

[1] http://netty.io/docs/stable/api/org/jboss/netty/handler/codec/frame/FrameDecoder.html

Answer 2

是的，有一种方法可以做到这一点，但是您必须给我们更多才能做其他事情。