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transport_simpl.h

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/* -*- c++ -*- */
/**************************************************************************
 Copyright (c) 2000-2001, Tony Garnock-Jones
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#ifndef MPS_Transport_Simpl_H
#define MPS_Transport_Simpl_H

#include <mps/mps.h>
#include <map>

namespace MPS {

/**
 * Implements a Transport class for accessing and
 * serving MPS objects via the SIMPL protocol
 * (http://www.holoweb.net/~simpl/). */
class SimplTransport: public MPS::Transport {
private:
  static SimplTransport *instance;      ///< The single, per-application instance of SimplTransport

  //---------------------------------------------------------------------------

  class SimplIOStream;          ///< Subclass of MPS::InputStream and MPS::OutputStream
  class SimplConnection;        ///< Subclass of MPS::Connection - holds FCID

  typedef map< int, Server * > serverMap_t;

  //---------------------------------------------------------------------------

  int nextOid;                          ///< Next OID available for registration here.
  string simplName;                     ///< Our local SIMPL server name
  serverMap_t serverMap;                ///< All OIDs we serve

  //---------------------------------------------------------------------------

  SimplTransport(string const &simplName);

protected:
  virtual ref<Connection> connectTo(Address const &connectionSpec);
  virtual string registerServer(Server *server, Address const &spec);
  virtual string deregisterServer(Server *server, Address const &spec);

  friend class SimplIOStream;
  static void pushMessage(void *sender, char const *msg, int msglen);
  static void *popMessage(char *msg, int &msglen);

public:
  /**
   * Creates the single per-application instance of SimplTransport, and
   * registers it using Transport::registerTransport().
   *
   * @param namingServerLocation resolved address of the naming server to use
   * @param simplName the name to bind to our SIMPL mailbox */
  static void initialise(string const &simplName) {
    if (instance == 0) {
      instance = new SimplTransport(simplName);
    }
  }

  static void mainloop();
};

}

#endif

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