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Pure Java implementation of libzmq
There is a newer version: 0.6.0
/*
    Copyright (c) 2007-2012 iMatix Corporation
    Copyright (c) 2009-2011 250bpm s.r.o.
    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see .
*/

package zmq;

public class Sub extends XSub {

    public static class SubSession extends XSub.XSubSession {

        public SubSession(IOThread io_thread_, boolean connect_,
                SocketBase socket_, Options options_, Address addr_) {
            super(io_thread_, connect_, socket_, options_, addr_);
        }

    }
    
    public Sub(Ctx parent_, int tid_, int sid_) {
        super(parent_, tid_, sid_);
        
        options.type = ZMQ.ZMQ_SUB;

        //  Switch filtering messages on (as opposed to XSUB which where the
        //  filtering is off).
        options.filter = true;
    }

    @Override
    public boolean xsetsockopt (int option_, Object optval_)
    {
        if (option_ != ZMQ.ZMQ_SUBSCRIBE && option_ != ZMQ.ZMQ_UNSUBSCRIBE) {
            return false;
        }

        byte[] val;
        
        if (optval_ instanceof String)
            val = ((String)optval_).getBytes(ZMQ.CHARSET);
        else if (optval_ instanceof byte[])
            val = (byte[]) optval_;
        else
            throw new IllegalArgumentException();
            
        //  Create the subscription message.
        Msg msg = new Msg(val.length + 1);
        if (option_ == ZMQ.ZMQ_SUBSCRIBE)
            msg.put((byte) 1);
        else if (option_ == ZMQ.ZMQ_UNSUBSCRIBE)
            msg.put((byte) 0);
        msg.put (val);
        //  Pass it further on in the stack.
        boolean rc = super.xsend(msg);
        if (!rc)
            throw new IllegalStateException("Failed to send subscribe/unsubscribe message");

        return true;
    }
    
    @Override
    protected boolean xsend (Msg msg_)
    {
        //  Overload the XSUB's send.
        throw new UnsupportedOperationException();
    }

    @Override
    protected boolean xhas_out ()
    {
        //  Overload the XSUB's send.
        return false;
    }


}