Architecture: IoFilter chain vs ProtocolCodecFilter

[James Im <im...@hotmail.com>]

In the doc there is a file called "Architecture.vsd" that present 2 ways
of building a protocol with mina.

you have to choice to use IoFilters or use a ProtocolCodecFilter.

I don't know why I should choose one over the other. I believe that I
could implement my server either way.

So my questions are:

Is the performance of one better than the other?
Which architecture do you prefer/use? why?

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Re: Architecture: IoFilter chain vs ProtocolCodecFilter

["Steven E. Harris" <se...@panix.com>]

James Im <im...@hotmail.com> writes:

> Which architecture do you prefer/use? why?

Though I'm working on a client, I'll still chime in. The
ProtocolCodecFilter just formalizes a particular intention of a filter
-- reshaping the type of the message, with symmetric translation "in"
or "out". The ProtocolCodecFilter is an implementation of an IoFilter
that delegates more specific and relevant calls to your encoder and
decoder. Using it makes the protocol-specific code's purpose more
obvious.

Also, at least on the decoding side, the ProtocolCodecFilter can be
plugged together with some helpful implementations like
CumulativeProtocolDecoder and TextLineDecoder.

-- 
Steven E. Harris