Examples of protobuf in Netty.

The Netty provides two encoders (Protobufencoder,protobufvarint32lengthfieldprepender) for the Protobuf, Two decoders (Protobufvarint32framedecoder,protobufdecoder)
[note] The so-called encoding is to encode the data type used by the application into a binary byte stream transmitted over the network, and vice versa.
Look at an example of a Netty official online that uses protobuf:
Localtimeprotocol.proto file:
[Java] View Plain copy print? package org.jboss.netty.example.localtime;   option optimize_for = speed;    enum continent {     AFRICA = 0;     america  = 1;     ANTARCTICA = 2;     ARCTIC = 3;      ASIA = 4;     ATLANTIC = 5;      AUSTRALIA = 6;     EUROPE = 7;     indian  = 8;     MIDEAST = 9;     PACIFIC = 10;   }   message location {     required Continent  continent = 1;     required string city = 2;  }    message locations {     repeated location location = 1;  }   enum dayofweek {     SUNDAY =  1;     MONDAY = 2;     TUESDAY = 3;      WEDNESDAY = 4;     THURSDAY = 5;      FRIDAY = 6;     SATURDAY = 7;  }   Message  LocalTime {     required uint32 year = 1;      required uint32 month = 2;     required uint32  dayofmonth = 4;     required DayOfWeek dayOfWeek = 5;      required uint32 hour = 6;     required uint32  minute = 7;     required uint32 second = 8;   }   Message localtimes {     repeated LocalTime localTime = 1;   }  

Package org.jboss.netty.example.localtime;
Option optimize_for = SPEED;
Enum Continent {
  AFRICA = 0;
  AMERICA = 1;
  antarctica = 2;
  ARCTIC = 3;
  ASIA = 4;
  Atlantic = 5;
  AUSTRALIA = 6;
  EUROPE = 7;
  INDIAN = 8;
  Mideast = 9;
  PACIFIC = ten;
}
Message Location {
  Required continent continent = 1;
  Required String city = 2;
}
Message Locations {
  repeated Location Location = 1;
}
Enum DayOfWeek {
  SUNDAY = 1;
  MONDAY = 2;
  Tuesday = 3;
  Wednesday = 4;
  Thursday = 5;
  FRIDAY = 6;
  SATURDAY = 7;
}
Message localtime {
  required uint32 year = 1;
  Required UInt32 month = 2;
  Required UInt32 dayofmonth = 4;
  Required DayOfWeek DayOfWeek = 5;
  Required UInt32 hour = 6;
  Required UInt32 minute = 7;
  Required UInt32 second = 8;
}
Message Localtimes {
  repeated localtime localtime = 1;
}

Client:
[Java] View Plain copy print? public class localtimeclient {          public  Static void main (String[] args)  throws Exception {            // parse options.            String host =  "localhost";            int port = 8080;            Collection<String> cities = new ArrayList< String> () {     private static final long serialversionuid =  1L;     {             add ( "America/new_york");             add ("Asia/Seoul");             }           };            // set up.            clientbootstrap bootstrap = new  clientbootstrap (                    new nioclientsocketchannelfactory (                             executors.newcachedthreadpool (),                             Executors.newcachedthreadpool ());              //  configure the event pipeline factory.    &NBSP;&NBSP;&NBSP;&NBsp;    bootstrap.setpipelinefactory (New localtimeclientpipelinefactory ());               // make a new connection .            ChannelFuture connectFuture =                bootstrap.connect (new  Inetsocketaddress (Host, port));              //  wait until the connection is made successfully.            Channel channel =  Connectfuture.awaituninterruptibly () Getchannel ();               // get the handler instance to initiate the request.            localtimeclienthandler handler =                channel.getpipeline (). Get (Localtimeclienthandler.class);               // request and get the response.            List<String> response =  Handler.getlocaltimes (cities);           // Close  The connection.            channel.close () awaituninterruptibly ();               // shut down all thread  pools to exit.            bootstrap.releaseexternalresources ();              // Print the Response at last but not least.            Iterator<String> i1 =  Cities.iterator ();           iterator<string> i2  = response.iterator ();           while  ( I1.hasnext ())  {                System.out.format ("%28s: %s%n",  i1.next (),  i2.next ());            }       }  }  

public class Localtimeclient {public static void main (string[] args) throws Exception {//Parse options.
        String host = "localhost";
        int port = 8080;
  Collection<string> cities = new Arraylist<string> () {private static final long serialversionuid = 1L;
          {Add ("america/new_york");
         Add ("Asia/seoul");
        }
        };
        Set up.
                        Clientbootstrap bootstrap = new Clientbootstrap (New Nioclientsocketchannelfactory (

        Executors.newcachedthreadpool (), Executors.newcachedthreadpool ());
        Configure the event pipeline factory.

        Bootstrap.setpipelinefactory (New Localtimeclientpipelinefactory ());
        Make a new connection.

        Channelfuture connectfuture = bootstrap.connect (new inetsocketaddress (host, port));
        Wait until the connection is made successfully. Channel Channel = ConnectfuturE.awaituninterruptibly (). Getchannel ();
        Get the handler instance to initiate the request.

        Localtimeclienthandler handler = Channel.getpipeline (). get (Localtimeclienthandler.class);
        Request and get the response.
        list<string> response = handler.getlocaltimes (cities);
        Close the connection.

        Channel.close (). awaituninterruptibly ();
        Shut down all thread pools to exit.

        Bootstrap.releaseexternalresources ();
        Print the response at last but not least.
        iterator<string> i1 = Cities.iterator ();
        iterator<string> i2 = Response.iterator ();
        while (I1.hasnext ()) {System.out.format ("%28s:%s%n", I1.next (), I2.next ()); }
    }
}

[Java] View Plain copy print? public class localtimeclientpipelinefactory implements channelpipelinefactory {           public channelpipeline getpipeline ()  throws  exception {           channelpipeline p =  pipeline ();    //decoding with            p.addlast ( "Framedecoder",  new protobufvarint32framedecoder ());          The   //constructor passes the type to be decoded            p.addlast (" Protobufdecoder ",  new protobufdecoder (LocalTimeProtocol.LocalTimes.getDefaultInstance ());     //Coding            p.addlast ("Frameencoder",  New protobufvarint32lengthfieldprepender ());           P.addlast ("Protobufencoder",  new protobufencoder ());    //business logic             p.addlast ("Handler",  new localtimeclienthandler ());            return p;       }   }  

public class Localtimeclientpipelinefactory implements Channelpipelinefactory {public

    channelpipeline Getpipeline () throws Exception {
        Channelpipeline P = pipeline ();
 Decoding with
        p.addlast ("Framedecoder", New Protobufvarint32framedecoder ());
        The constructor passes the type
        p.addlast ("Protobufdecoder") to be decoded, the new Protobufdecoder ( LocalTimeProtocol.LocalTimes.getDefaultInstance ()));
 Coding with
        p.addlast ("Frameencoder", New Protobufvarint32lengthfieldprepender ());
        P.addlast ("Protobufencoder", New Protobufencoder ());
 Business logic with
        p.addlast ("handler", New Localtimeclienthandler ());
        return p;
    }
}

[Java] View Plain copy print? public class localtimeclienthandler extends simplechannelupstreamhandler {           private static final Logger logger =  Logger.getlogger (                LocalTimeClientHandler.class.getName ());          // Stateful  Properties        private volatile Channel channel;       //to store results returned by server        private final  Blockingqueue<localtimes> answer = new linkedblockingqueue<localtimes> ();           public list<string> getlocaltimes (Collection <string> cities)  {            Locations.builder buiLder = locations.newbuilder ();    //constructs locations objects transmitted to the server             for  (string c: cities)  {                string[] components = c.split ("/");               builder.addlocation ( Location.newbuilder () .                    setcontinent (continent.valueof (components[0].touppercase)) .                    setcity (Components[1]). Build ());           }               channel.write (Builder.build ());                localtimes localtimes;           boolean  interrupted = false;           for  (;;)  {               try {      //from the queue, which is the localtimes from the service end.                     Localtimes = answer.take ();                    break;                } catch  (interruptedexception e)  {                    interrupted = true;                } &nbsp         }               if  (interrupted)  {                thread.currentthread () interrupt ();            }              list<string> result  = new ArrayList<String> ();            for  (Localtime lt: localtimes.getlocaltimelist ())  {                result.add (                        new formatter (). Format (                                 "%4d-%02d-%02d %02d:%02d:%02d %s",                                 lt.getyear (),                                 lt.getmonth (),                                 lt.getdayofmonth (),                                 lt.gethour (),                    &nbSp;           lt.getminute (),                                 lt.getsecond (),                                 lt.getdayofweek (). Name ()). ToString ());            }              return result;        }           @Override        public void handleupstream (                channelhandlercontext ctx, channelevent e)  throws  Exception {           if  (e instanceof channelstateevent )  {               logger.info ( E.tostring ());           }            super.handleupstream (ctx, e);       }            @Override        public void  Channelopen (channelhandlercontext ctx, channelstateevent e)