Server and Client at the same time

[gonzalo diethelm]

Hi Trustin,

 

Thanks very much for your new Proxy example. I had taken some time yesterday to try and write what I was describing before (using the Telnet example as a basis); it will be very useful to me to compare it to what you wrote. I have several questions (and metaquestions) for now:

 

*         It would be great if the Java source code (like the link you provided) could be shown with syntax coloring and line numbers.

*         In your HexDumpProxy example, you only create a ServerBootstrap but do not create a ClientBootstrap; instead, you create the NioClientSocketChannelFactory “stand alone”. Then, within the HexDumpProxyInboundHandler you do create the ClientBootstrap. Why do you do it this way?

*         In the HexDumpProxyPipelineFactory you only add one handler (a HexDumpProxyInboundHandler) to the pipeline. Yesterday, with my own code, I tried doing this but got runtime exceptions indicating I could not cast a String to a ChannelBuffer. After looking more closely to the Telnet example, I decided to add three additional handlers before my own: a DelimiterBasedFrameDecoder, a StringDecoder and a StringEncoder. With that, my code worked fine, but I don't understand how you don't need those same handlers in the Proxy.

*         From what I understand, the OutboundHandler as implemented is receiving messages and sending them right back to the proxy. This caters to my “requirements”, but it might be clearer for a simple proxy example to just print out the received messages.

*         Other than the javadoc documentation, is there a good “manual for developers using Netty” anywhere? The user guide is very enlightening, but I am thinking more along the lines of architectural designs, patterns, when to use a class or another, etc.

 

Finally, for full disclosure: I posted a similar question (I mean my “requirements”) on the MINA mailing list. I know next to nothing about MINA and Netty, and am trying to compare them for my purposes.

 

Thanks again and best regards,


 

-- 

Gonzalo Diethelm

DCV - Chile

 

 

> -----Original Message-----

> From: netty-users-bounces at lists.jboss.org [mailto:netty-users-

> bounces at lists.jboss.org] On Behalf Of "??? (Trustin Lee)"

> Sent: Friday 12 Jun 2009 04:50

> To: netty-users at lists.jboss.org

> Subject: Re: Server and Client at the same time

> 

> Hi Gonzus,

> 

> I have been asked by many people about implementing such a proxy server,

> so I decided to write an example proxy server.  It's much easier to

> write an implementation than to explain how to do that, especially when

> it comes down to proxy server. :)

> 

> Check this out:

> 

> http://viewvc.jboss.org/cgi-

> bin/viewvc.cgi/netty/trunk/src/main/java/org/jboss/netty/example/proxy/

> 

> Shutting down is not very different from writing an ordinary server or

> client application.  Only one difference is that you need to shut down

> both client side and server side ChannelFactory at last.

> 

> HTH,

> Trustin

> 

> On 2009-06-11 오ﾈﾄ 11:56, gonzus wrote:

> >

> > Hello everyone, this is my first post here. I am examining Netty (after

> a

> > brief look at MINA) and would like to gather opinions on how to

> implement a

> > proof of concept for my requirements.

> >

> > I intend to have two copies of the same program running on the same

> machine

> > (this is not a requirement, it is just easier). The two programs will be

> run

> > like this:

> >

> > $ program 8001 8002

> > $ program 8002 8001

> >

> > This means the first copy will bind on port 8001 and try to connect to

> port

> > 8002, and the second program will bind on port 8002 and try to connect

> to

> > port 8001. After successful connection, the program will send a single

> > string "Hello World"; after making sure it has sent one string and

> received

> > one string, the program will shut down gracefully.

> >

> > What I am trying to learn is how to do the following in Netty:

> >

> > 1. Have an acceptor and connector at the same time running on the same

> > program.

> > 2. Handle failed connect attempts and a reconnection policy.

> > 3. Proper way of shutting down a server.

> >

> > Are there any examples that could help me implement this? Any

> suggestions?

> >

> > Extra credit :-D if the program ends up being capable of running a

> single

> > copy like this and doing "the obvious":

> >

> > $ program 8003 8003

> >

> > Thanks in advance and best regards.

> 

> 

> --

> - Trustin Lee, http://gleamynode.net/

 



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