path: root/TAO/examples/POA/On_Demand_Loading/server.cpp

// $Id$

//============================================================================
//
//  =FILENAME
//     server.cpp
//
//  =DESCRIPTION
//     Server to test the Servant Activator. The servant activator
//     loads a servant on demand and makes its association with the
//     object.
//
//  =AUTHOR
//     Kirthika Parameswaran <kirthika@cs.wustl.edu>
//
//=============================================================================

#include "ace/streams.h"
#include "Servant_Activator.h"

ACE_RCSID(On_Demand_Activation, server, "$Id$")

static char *ior_output_file = 0;

// The input arguments are accepted.

static int
parse_args (int argc, char **argv)
{
  ACE_Get_Opt get_opts (argc, argv, "f:");
  int c;

  while ((c = get_opts ()) != -1)
    switch (c)
      {
      case 'f':
        ior_output_file = get_opts.optarg;
        break;

      case '?':
      default:
        ACE_ERROR_RETURN ((LM_ERROR,
                           "usage:  %s "
                           "[-f ior_output_file] "
                           "\n",
                           argv [0]),
                          -1);
      }

  // Indicates successful parsing of command line.
  return 0;
}

// The IOR is written to a file.

static int
write_iors_to_file (const char *first_ior)
{
  if (ior_output_file == 0)
    // No filename was specified; simply return
    return 0;

  char ior_output_file_1[BUFSIZ];


  ACE_OS::sprintf (ior_output_file_1, "%s", ior_output_file);


  FILE *output_file_1 = ACE_OS::fopen (ior_output_file_1, "w");

  
  if (output_file_1 == 0)
    ACE_ERROR_RETURN ((LM_ERROR, "Cannot open output files for writing IORs: %s, %s\n", 
                       ior_output_file_1),
                      -1);

  int result = ACE_OS::fprintf (output_file_1,
				"%s", 
				first_ior);
  if (result <= 0
      || ACE_static_cast(size_t,result) != ACE_OS::strlen (first_ior))
    ACE_ERROR_RETURN ((LM_ERROR, 
                       "ACE_OS::fprintf failed while writing %s to %s\n", 
                       first_ior,
                       ior_output_file_1),
                      -1);
  
 
  
  ACE_OS::fclose (output_file_1);
  
  return 0;
}

int
main (int argc, char **argv)
{
  CORBA::Environment env;

  // Initialize the ORB.
  CORBA::ORB_var orb = CORBA::ORB_init (argc, argv, 0, env);

  if (env.exception () != 0)
    {
      env.print_exception ("CORBA::ORB_init");
      return -1;
    }

  int result = parse_args (argc, argv);
  if (result != 0)
    return result;
  
  // Get an Object reference to RootPOA.
  CORBA::Object_var obj =
    orb->resolve_initial_references ("RootPOA");

  // Narrow the Object reference to a POA reference
  PortableServer::POA_var root_poa =
    PortableServer::POA::_narrow (obj.in (), env);

  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POA::_narrow");
      return -1;
    }

  // Get the POAManager of RootPOA

  PortableServer::POAManager_var poa_manager =
    root_poa->the_POAManager (env);

  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POA::the_POAManager");
      return -1;
    }

  CORBA::PolicyList policies (4);
  policies.length (4);

  // ID Assignment Policy
  policies[0] =
    root_poa->create_id_assignment_policy (PortableServer::USER_ID, env);
  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POA::create_id_assignment_policy");
      return -1;
    }

  // Lifespan Policy
  policies[1] =
    root_poa->create_lifespan_policy (PortableServer::PERSISTENT, env);
  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POA::create_lifespan_policy");
      return -1;
    }
  
  // Request Processing Policy
  policies[2] =
    root_poa->create_request_processing_policy (PortableServer::USE_SERVANT_MANAGER, env);
  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POA::create_request_processing_policy");
      return -1;
    }
  
  PortableServer::POA_var first_poa;
  {
    // Servant Retention Policy
    policies[3] =
      root_poa->create_servant_retention_policy (PortableServer::RETAIN, env);
    if (env.exception () != 0)
      {
        env.print_exception ("PortableServer::POA::create_servant_retention_policy");
        return -1;
      }

    ACE_CString name = "firstPOA";

    // Create firstPOA as the child of RootPOA with the above policies
    // firstPOA will use SERVANT_ACTIVATOR because of RETAIN policy.
    first_poa = root_poa->create_POA (name.c_str (),
                                      poa_manager.in (),
                                      policies,
                                      env);
    if (env.exception () != 0)
      {
        env.print_exception ("PortableServer::POA::create_POA");
        return -1;
      }
  }
  
  // Destroy the policy objects as they have been passed to create_POA
  // and no longer needed.
  for (CORBA::ULong i = 0;
       i < policies.length () && env.exception () == 0;
       ++i)
    {
      CORBA::Policy_ptr policy = policies[i];
      policy->destroy (env);
    }
  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POA::create_POA");
      return -1;
    }

  Dir_Service_Activator servant_activator_impl (orb.in ());
  PortableServer::ServantActivator_var servant_activator =
    servant_activator_impl._this (env);

  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POAManager::_this");
      return -1;
    }

  // Set Dir_Service_Activator object as the servant_manager of
  // firstPOA.
  first_poa->set_servant_manager (servant_activator.in (), env);
  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POAManager::set_servant_manager");
      return -1;
    }

  // Create a reference with user created ID in firstPOA which uses
  // the Dir_Service_Activator. Note the format of the ObjectID specified.
  // Its factory_method@library_name whihc is then used by the servant activator to 
  // obtain and load the right servant.
  PortableServer::ObjectId_var first_dir_service_oid =
    PortableServer::string_to_ObjectId ("DirService:create_dir_service");

  CORBA::Object_var first_dir_service =
    first_poa->create_reference_with_id (first_dir_service_oid.in (), "IDL:Dir_Service:1.0", env);

  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POA::create_reference_with_id");
      return -1;
    }
 
  // Invoke object_to_string on the references created in firstPOA
  CORBA::String_var first_dir_service_ior = 
    orb->object_to_string (first_dir_service.in (), env);

  if (env.exception () != 0)
    {
      env.print_exception ("CORBA::ORB::object_to_string");
      return -1;
    }

  // Print the ior's of first_dir_service 
  ACE_DEBUG((LM_DEBUG,"%s\n",
	     first_dir_service_ior.in ()));

  int write_result = write_iors_to_file (first_dir_service_ior.in ());

  if (write_result != 0)
    return write_result;

  // Set the poa_manager state to active, ready to process requests.
  poa_manager->activate (env);

  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POAManager::activate");
      return -1;
    }

  // Run the ORB.
  if (orb->run () == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "CORBA::ORB::run"), -1);

  // Destroy the root_poa and also first_poa and second_poa
  root_poa->destroy (1,
                     1,
                     env);
  if (env.exception () != 0)
    {
      env.print_exception ("PortableServer::POA::destroy");
      return -1;
    }

  return 0;
}