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Pure Java implementation of libzmq
There is a newer version: 0.6.0
/*
    Copyright (c) 2009-2011 250bpm s.r.o.
    Copyright (c) 2007-2009 iMatix Corporation
    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;

//  Base class for all objects that participate in inter-thread
//  communication.
public abstract class ZObject {


    //  Context provides access to the global state.
    private final Ctx ctx;

    //  Thread ID of the thread the object belongs to.
    private final int tid;
    
    protected ZObject(Ctx ctx, int tid) {
    	this.ctx = ctx;
    	this.tid = tid;
    }
    
    protected ZObject (ZObject parent_) {
    	this(parent_.ctx, parent_.tid);
    }    
    
    protected int get_tid ()
    {
        return tid;
    }
    
    protected Ctx get_ctx ()
    {
        return ctx;
    }
    
    protected void process_command(Command cmd_) {
        switch (cmd_.type()) {

        case ACTIVATE_READ:
            process_activate_read ();
            break;

        case ACTIVATE_WRITE:
            process_activate_write ((Long)cmd_.arg);
            break;

        case STOP:
            process_stop ();
            break;

        case PLUG:
            process_plug ();
            process_seqnum ();
            break;

        case OWN:
            process_own ((Own)cmd_.arg);
            process_seqnum ();
            break;

        case ATTACH:
            process_attach ((IEngine)cmd_.arg);
            process_seqnum ();
            break;

        case BIND:
            process_bind ((Pipe)cmd_.arg);
            process_seqnum ();
            break;

        case HICCUP:
            process_hiccup (cmd_.arg);
            break;
    
        case PIPE_TERM:
            process_pipe_term ();
            break;
    
        case PIPE_TERM_ACK:
            process_pipe_term_ack ();
            break;
    
        case TERM_REQ:
            process_term_req ((Own)cmd_.arg);
            break;
    
        case TERM:
            process_term ((Integer)cmd_.arg);
            break;
    
        case TERM_ACK:
            process_term_ack ();
            break;
    
        case REAP:
            process_reap ((SocketBase)cmd_.arg);
            break;
            
        case REAPED:
            process_reaped ();
            break;
    
        default:
            throw new IllegalArgumentException();
        }

    }
    
    protected boolean register_endpoint (String addr_, Ctx.Endpoint endpoint_)
    {
        return ctx.register_endpoint (addr_, endpoint_);
    }
    
    protected void unregister_endpoints (SocketBase socket_)
    {
        ctx.unregister_endpoints (socket_);
    }
    
    protected Ctx.Endpoint find_endpoint (String addr_)
    {
        return ctx.find_endpoint (addr_);
    }
    
    protected void destroy_socket (SocketBase socket_)
    {
        ctx.destroy_socket (socket_);
    }

    //  Chooses least loaded I/O thread.
    protected IOThread choose_io_thread (long affinity_)
    {
        return ctx.choose_io_thread (affinity_);
    }
    
    protected void send_stop ()
    {
        //  'stop' command goes always from administrative thread to
        //  the current object. 
        Command cmd = new Command(this, Command.Type.STOP);
        ctx.send_command (tid, cmd);
    }
    
    
    protected void send_plug (Own destination_) {
        send_plug(destination_, true);
    }

    protected void send_plug (Own destination_, boolean inc_seqnum_)
    {
        if (inc_seqnum_)
            destination_.inc_seqnum ();

        Command cmd = new Command(destination_, Command.Type.PLUG);
        send_command (cmd);
    }
    
    
    protected void send_own (Own destination_, Own object_)
    {
        destination_.inc_seqnum ();
        Command cmd = new Command(destination_, Command.Type.OWN, object_);
        send_command (cmd);
    }
    
    protected void send_attach (SessionBase destination_, IEngine engine_) {
        send_attach(destination_, engine_, true);
    }
    
    protected void send_attach (SessionBase destination_,
            IEngine engine_, boolean inc_seqnum_)
    {
        if (inc_seqnum_)
            destination_.inc_seqnum ();

        Command cmd = new Command(destination_, Command.Type.ATTACH, engine_);
        send_command (cmd);
    }

    
    protected void send_bind (Own destination_, Pipe pipe_)
    {
        send_bind(destination_, pipe_, true);
    }
    
    protected void send_bind (Own destination_, Pipe pipe_,
            boolean inc_seqnum_)
    {
        if (inc_seqnum_)
            destination_.inc_seqnum ();

        Command cmd = new Command(destination_, Command.Type.BIND, pipe_);
        send_command (cmd);
    }


    protected void send_activate_read(Pipe destination_)
    {
        Command cmd = new Command(destination_, Command.Type.ACTIVATE_READ);
        send_command (cmd);
    }

    protected void send_activate_write (Pipe destination_,
            long msgs_read_)
    {
        Command cmd = new Command(destination_, Command.Type.ACTIVATE_WRITE, msgs_read_);
        send_command (cmd);
    }

    protected void send_hiccup (Pipe destination_, Object pipe_)
    {
        Command cmd = new Command(destination_, Command.Type.HICCUP, pipe_);
        send_command (cmd);
    }

    
    protected void send_pipe_term (Pipe destination_)
    {
        Command cmd = new Command(destination_, Command.Type.PIPE_TERM);
        send_command (cmd);
    }


    protected void send_pipe_term_ack (Pipe destination_)
    {
        Command cmd = new Command(destination_, Command.Type.PIPE_TERM_ACK);
        send_command (cmd);
    }


    protected void send_term_req (Own destination_,
            Own object_)
    {
        Command cmd = new Command(destination_, Command.Type.TERM_REQ, object_);
        send_command (cmd);
    }
    

    protected void send_term (Own destination_, int linger_)
    {
        Command cmd = new Command(destination_, Command.Type.TERM, linger_);
        send_command (cmd);
        
    }
    

    protected void send_term_ack (Own destination_)
    {   
        Command cmd = new Command(destination_, Command.Type.TERM_ACK);
        send_command (cmd);
    }   

    protected void send_reap (SocketBase socket_)
    {
        Command cmd = new Command(ctx.get_reaper (), Command.Type.REAP, socket_);
        send_command (cmd);
    }
    
    
    protected void send_reaped ()
    {
        Command cmd = new Command(ctx.get_reaper (), Command.Type.REAPED);
        send_command (cmd);
    }



    protected void send_done ()
    {
        Command cmd = new Command(null, Command.Type.DONE);
        ctx.send_command(Ctx.term_tid, cmd);
    }


    protected void process_stop() {
        throw new UnsupportedOperationException();
    }
    
    protected void process_plug() {
        throw new UnsupportedOperationException();
    }
    

    protected void process_own(Own object) {
        throw new UnsupportedOperationException();
    }

    protected void process_attach(IEngine engine) {
        throw new UnsupportedOperationException();
    }
    
    protected void process_bind(Pipe pipe) {
        throw new UnsupportedOperationException();
    }
    
    protected void process_activate_read() {
        throw new UnsupportedOperationException();
    }

    protected void process_activate_write(long msgs_read_) {
        throw new UnsupportedOperationException();
    }
    
    protected void process_hiccup(Object hiccup_pipe) {
        throw new UnsupportedOperationException();
    }

    protected void process_pipe_term() {
        throw new UnsupportedOperationException();
    }
    
    protected void process_pipe_term_ack() {
        throw new UnsupportedOperationException();
    }
    
    protected void process_term_req(Own object) {
        throw new UnsupportedOperationException();
    }
    
    protected void process_term(int linger) {
        throw new UnsupportedOperationException();
    }
    

    protected void process_term_ack() {
        throw new UnsupportedOperationException();
    }

    protected void process_reap(SocketBase socket) {
        throw new UnsupportedOperationException();
    }
    
    protected void process_reaped() {
        throw new UnsupportedOperationException();
    }
    
    //  Special handler called after a command that requires a seqnum
    //  was processed. The implementation should catch up with its counter
    //  of processed commands here.
    protected void process_seqnum() {
        throw new UnsupportedOperationException();
    }
    
    
    private void send_command (Command cmd_)
    {
        ctx.send_command (cmd_.destination().get_tid (), cmd_);
    }

}