Java, Netty: Help Understanding ChannelPipelines and addLast -



Java, Netty: Help Understanding ChannelPipelines and addLast -

i working through some examples of using netty io server. working on understanding pipeline construct, , how elements added pipeline effect each other, , how order of import in pipeline. far have created kid handler follows in main method

serverbootstrap.childhandler(new channelinitializer<socketchannel>() { @override protected void initchannel(socketchannel socketchannel) throws exception { channelpipeline pipeline = socketchannel.pipeline().addlast( ... ); } }

i want have pipeline 1 handler generates long system.currenttimemillis() , handler encodes string in format provided date classes tostring method. end started this:

channelpipeline pipeline = socketchannel.pipeline().addlast( new channelinboundhandleradapter() { @override public void channelactive(final channelhandlercontext channelhandlercontext) { byte[] bytes = "press homecoming time\n".getbytes(); channelhandlercontext.writeandflush( channelhandlercontext .alloc() .buffer(bytes.length) .writebytes(bytes)); } @override public void channelread(final channelhandlercontext channelhandlercontext, object object) { seek { channelfuture channelfuture = channelhandlercontext.writeandflush( channelhandlercontext .alloc() .buffer() .writelong(system.currenttimemillis())); channelfuture.addlistener(channelfuturelistener.close); } { referencecountutil.release(object); } } @override public void exceptioncaught(channelhandlercontext channelhandlercontext, throwable throwable) { throwable.printstacktrace(); channelhandlercontext.close(); } } );

how modify encoder encodes payload date string such 2014-10-07t18:34:10.897-00:00? right way think pipeline, though trivial example?

in terms of understanding, looking @ example, unclear how order of pipeline executed. example, if assume execute in linear order, thing info payload gzipped , ungzipped. missing?

pipeline.addlast(zlibcodecfactory.newzlibencoder(zlibwrapper.gzip)); pipeline.addlast(zlibcodecfactory.newzlibdecoder(zlibwrapper.gzip)); // add together number codec first, pipeline.addlast(new bigintegerdecoder()); pipeline.addlast(new numberencoder()); // , business logic. // please note create handler every new channel // because has stateful properties. pipeline.addlast(new factorialserverhandler());

update: found this diagram still trying work out how coerce long in illustration above date on way client. how that?

java netty

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