Hi Ming Qin,
smart filters is something I didn't touch for a long time and wanted
to come back to it sometime in future.
So if you have interest to reimplement smart filters and make it
working - you're welcome, will appreciate that.
I'd look at SmartStringFilter as a part of SmartFilter. SmartFilter
was originally intended to hide the parsing process, and make possible
to serialize/deserialize POJO objects (sometimes with Java annotations
help).
So coming back to SmartStringFilter, as part of SmartFilter you can
define following class:
class MyCusomPacket {
@CharSequence(terminate="\r\n")
String a;
@CharSequence(terminate="abc")
String b;
}
and SmartFilter, using SmartStringFilter, should be able to serialize/
deserialize correctly instances of MyCustomPacket class.
Also, talking about SmartFilters, there is project google protobuf
[1], which defines general protocol description language. It could be
interesting to have Grizzly 2.0 support for that, for example Mina and
Netty have it.
Will appreciate your help.
Thanks.
WBR,
Alexey.
[1]
http://code.google.com/p/protobuf/
On Mar 3, 2010, at 9:06 , ming qin wrote:
> Grizzly 2dot0 : Smart String Filter with Multiple String
> Terminator Symbols
>
>
> Scenario:
> In string-based protocol,
> one intended string request is started with starter symbol-“
> watchVideo” and ended with terminator symbol “\r#\n”,
>
> another intended string request is started with started
> symbol-“listenMusic” and ended with terminator symbol “\r&*ABC”
>
> Feature of SmartStringFilter
>
> Grizzly 2dot0’s Processor will be driven by SmartStringFiltor to
> constantly polling a Channel to read bytes till whole intended
> string request is read into memory-Grizzly CompoisteByte
>
> The tricky parts of above processor polling are :
> Individual string request has unique starter and terminator
> symbols.
> String requests are not flowed into server in unpredictable order.
>
> Proposal:
> Can I implement above feature in Grizzly 2dot0 as
> SmartStringFilter(Charset. Charset , String …
> stringStartingTerminatingSymbs );
>
>
>
> Below is my server main code to import this kind of smartStringFilter:
>
> public static void main(String[] args) throws IOException {
> // Create a FilterChain using FilterChainBuilder
> FilterChainBuilder filterChainBuilder =
> FilterChainBuilder.singleton();
> // Add TransportFilter, which is responsible
> // for reading and writing data to the connection
> filterChainBuilder.add(new TransportFilter());
> // StringFilter is responsible for parsing single string line
> filterChainBuilder.add(new
> SmartStringFilter(Charset.forName("US-ASCII"), “ watchVideo|\r#\n
> “ , …… “listenMusic| r&*ABC “ ));
>
> ……
> filterChainBuilder.add(new EchoFilter());
>
> …..
>
> transport.start();
> ,,,,,,
> ,,,,,
>
>
>
> Ming Qin
> Cell Phone 858-353-2839
>