cb_server.cc

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#include <echo_callback.hh>

#ifdef HAVE_STD
#  include <iostream>
   using namespace std;
#else
#  include <iostream.h>
#endif


static CORBA::ORB_ptr orb;
static int            dying = 0;
static int            num_active_servers = 0;
static omni_mutex     mu;
static omni_condition sigobj(&mu);

//////////////////////////////////////////////////////////////////////

// A thread object used to server clients registered
// using the cb::Server::register() method.

class server_thread : public omni_thread {
public:
  inline server_thread(cb::CallBack_ptr client, const char* mesg, int period)
    : pd_client(cb::CallBack::_duplicate(client)),
      pd_mesg(mesg), pd_period(period) {}

  virtual void run(void* arg);

private:
  cb::CallBack_var  pd_client;
  CORBA::String_var pd_mesg;
  int               pd_period;
};


void
server_thread::run(void* arg)
{
  try {
    while( !dying ) {
      omni_thread::sleep(pd_period);
      pd_client->call_back(pd_mesg);
    }
  }
  catch(...) {
    cerr << "cb_server: Lost a client!" << endl;
  }

  cerr << "cb_server: Worker thread is exiting." << endl;

  mu.lock();
  int do_signal = --num_active_servers == 0;
  mu.unlock();
  if( do_signal )  sigobj.signal();
}

//////////////////////////////////////////////////////////////////////

// Implementation of cb::Server.

class server_i : public POA_cb::Server,
		 public PortableServer::RefCountServantBase
{
public:
  inline server_i() {}
  virtual ~server_i();


  virtual void one_time(cb::CallBack_ptr cb, const char* mesg);

  // NB. Because 'register' is a C++ keyword, we have to
  // use the prefix _cxx_ here.
  virtual void _cxx_register(cb::CallBack_ptr cb, const char* mesg,
			     CORBA::UShort period_secs);

  virtual void shutdown();
};


server_i::~server_i()
{
  cerr << "cb_server: The server object has been destroyed." << endl;
}


void
server_i::one_time(cb::CallBack_ptr cb, const char* mesg)
{
  if( CORBA::is_nil(cb) ) {
    cerr << "Received a nil callback.\n";
    return;
  }

  cerr << "cb_server: Doing a single call-back: " << mesg << endl;

  cb->call_back(mesg);
}


void
server_i::_cxx_register(cb::CallBack_ptr cb, const char* mesg,
		      CORBA::UShort period_secs)
{
  if( CORBA::is_nil(cb) ) {
    cerr << "Received a nil callback.\n";
    return;
  }

  cerr << "cb_server: Starting a new worker thread" << endl;

  mu.lock();
  num_active_servers++;
  mu.unlock();

  server_thread* server = new server_thread(cb, mesg, period_secs);
  server->start();
}


void
server_i::shutdown()
{
  omni_mutex_lock sync(mu);

  if( !dying ) {
    cerr << "cb_server: I am being shutdown!" << endl;

    // Tell the servers to exit, and wait for them to do so.
    dying = 1;

    while( num_active_servers > 0 )  sigobj.wait();

    // Shutdown the ORB (but do not wait for completion).  This also
    // causes the main thread to unblock from CORBA::ORB::run().
    orb->shutdown(0);
  }
}

//////////////////////////////////////////////////////////////////////

int main(int argc, char** argv)
{
  try {
    orb = CORBA::ORB_init(argc, argv);

    {
      CORBA::Object_var obj = orb->resolve_initial_references("RootPOA");
      PortableServer::POA_var poa = PortableServer::POA::_narrow(obj);
      PortableServer::POAManager_var pman = poa->the_POAManager();
      pman->activate();

      server_i* myserver = new server_i();
      obj = myserver->_this();             // *implicit activation*
      myserver->_remove_ref();

      CORBA::String_var sior(orb->object_to_string(obj));
      cerr << "'" << (char*) sior << "'" << endl;
      orb->run();
    }

    cerr << "cb_server: Returned from orb->run()." << endl;
    orb->destroy();
  }
  catch(CORBA::SystemException&) {
    cerr << "Caught CORBA::SystemException." << endl;
  }
  catch(CORBA::Exception&) {
    cerr << "Caught CORBA::Exception." << endl;
  }
  catch(omniORB::fatalException& fe) {
    cerr << "Caught omniORB::fatalException:" << endl;
    cerr << "  file: " << fe.file() << endl;
    cerr << "  line: " << fe.line() << endl;
    cerr << "  mesg: " << fe.errmsg() << endl;
  }
  catch(...) {
    cerr << "Caught unknown exception." << endl;
  }

  return 0;
}