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#include "Signal_Handler.h"
#include "orbsvcs/LoadBalancing/LB_LoadManager.h"
#include "tao/ORB_Core.h"
#include "ace/Get_Opt.h"
#include "ace/OS_main.h"
#include "ace/OS_NS_strings.h"
#include "tao/IORTable/IORTable.h"
#include "ace/Argv_Type_Converter.h"
#if defined (linux) && defined (ACE_HAS_THREADS)
# include "ace/Signal.h"
#endif /* linux && ACE_HAS_THREADS */
ACE_RCSID (LoadBalancer,
LoadBalancer,
"$Id$")
static ACE_CString lm_ior_file ("lm.ior");
void
usage (const ACE_TCHAR * cmd)
{
ACE_DEBUG ((LM_INFO,
ACE_TEXT ("Usage:\n")
ACE_TEXT (" %s\n")
ACE_TEXT (" -o <ior_output_file>\n")
ACE_TEXT (" -s <RoundRobin | Random | LeastLoaded>\n")
ACE_TEXT (" -h\n")
ACE_TEXT ("\n")
ACE_TEXT (" NOTE: Standard default values will be used ")
ACE_TEXT ("for \"LeastLoaded\" strategy.\n"),
cmd));
}
void
parse_args (int argc,
ACE_TCHAR *argv[],
int & default_strategy
ACE_ENV_ARG_DECL)
{
ACE_Get_Arg_Opt<ACE_TCHAR> get_opts (argc, argv, ACE_TEXT ("o:s:h"));
int c = 0;
while ((c = get_opts ()) != -1)
{
switch (c)
{
case 'o':
::lm_ior_file.set (ACE_TEXT_TO_CHAR_IN (get_opts.opt_arg ()));
break;
case 's':
if (ACE_OS::strcasecmp (get_opts.opt_arg (),
ACE_TEXT("RoundRobin")) == 0)
default_strategy = 0;
else if (ACE_OS::strcasecmp (get_opts.opt_arg (),
ACE_TEXT("Random")) == 0)
default_strategy = 1;
else if (ACE_OS::strcasecmp (get_opts.opt_arg (),
ACE_TEXT("LeastLoaded")) == 0)
default_strategy = 2;
else
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("Unknown strategy, using RoundRobin\n")));
break;
case 'h':
::usage (argv[0]);
ACE_OS::exit (0);
break;
default:
::usage (argv[0]);
ACE_THROW (CORBA::BAD_PARAM ());
}
}
}
#if defined (linux) && defined (ACE_HAS_THREADS)
// Only the main thread can handle signals in Linux. Run the
// LoadManager in thread other than main().
extern "C"
void *
TAO_LB_run_load_manager (void * orb_arg)
{
CORBA::ORB_ptr orb = static_cast<CORBA::ORB_ptr> (orb_arg);
// Only the main thread should handle signals.
//
// @@ This is probably unnecessary since no signals should be
// delivered to this thread on Linux.
ACE_Sig_Guard signal_guard;
ACE_DECLARE_NEW_CORBA_ENV;
ACE_TRY
{
orb->run (ACE_ENV_SINGLE_ARG_PARAMETER);
ACE_TRY_CHECK;
}
ACE_CATCHANY
{
ACE_PRINT_EXCEPTION (ACE_ANY_EXCEPTION,
"TAO Load Manager");
return reinterpret_cast<void *> (-1);
}
ACE_ENDTRY;
ACE_CHECK_RETURN (reinterpret_cast<void *> (-1));
return 0;
}
#endif /* linux && ACE_HAS_THREADS */
int
ACE_TMAIN (int argc, ACE_TCHAR *argv[])
{
ACE_Argv_Type_Converter convert (argc, argv);
ACE_DECLARE_NEW_CORBA_ENV;
ACE_TRY
{
// The usual server side boilerplate code.
CORBA::ORB_var orb = CORBA::ORB_init (convert.get_argc(),
convert.get_ASCII_argv(),
""
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
CORBA::Object_var obj =
orb->resolve_initial_references ("RootPOA"
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
PortableServer::POA_var root_poa =
PortableServer::POA::_narrow (obj.in ()
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
PortableServer::POAManager_var poa_manager =
root_poa->the_POAManager (ACE_ENV_SINGLE_ARG_PARAMETER);
ACE_TRY_CHECK;
poa_manager->activate (ACE_ENV_SINGLE_ARG_PARAMETER);
ACE_TRY_CHECK;
// "built-in" strategies are the following:
// 0 = RoundRobin
// 1 = Random
// 2 = LeastLoaded
int default_strategy = 1;
// Check the non-ORB arguments.
::parse_args (convert.get_argc(),
convert.get_TCHAR_argv(),
default_strategy
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
TAO_LB_LoadManager * lm;
ACE_NEW_THROW_EX (lm,
TAO_LB_LoadManager,
CORBA::NO_MEMORY (
CORBA::SystemException::_tao_minor_code (
TAO::VMCID,
ENOMEM),
CORBA::COMPLETED_NO));
ACE_TRY_CHECK;
PortableServer::ServantBase_var safe_lm = lm;
// Initalize the LoadManager servant.
lm->init (orb->orb_core ()->reactor (),
orb.in (),
root_poa.in ()
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
PortableGroup::Properties props (1);
props.length (1);
props[0].nam.length (1);
props[0].nam[0].id =
CORBA::string_dup ("org.omg.CosLoadBalancing.StrategyInfo");
CosLoadBalancing::StrategyInfo strategy_info;
switch (default_strategy)
{
case 0:
strategy_info.name = CORBA::string_dup ("RoundRobin");
break;
case 1:
strategy_info.name = CORBA::string_dup ("Random");
break;
case 2:
strategy_info.name = CORBA::string_dup ("LeastLoaded");
break;
default:
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("ERROR: LoadBalancer internal error.\n")
ACE_TEXT (" Unknown built-in strategy.\n")),
-1);
}
props[0].val <<= strategy_info;
lm->set_default_properties (props
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
CosLoadBalancing::LoadManager_var load_manager =
lm->_this (ACE_ENV_SINGLE_ARG_PARAMETER);
ACE_TRY_CHECK;
CORBA::String_var str =
orb->object_to_string (load_manager.in ()
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
// to support corbaloc
// Get a reference to the IOR table.
CORBA::Object_var tobj = orb->resolve_initial_references ("IORTable"
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
IORTable::Table_var table = IORTable::Table::_narrow (tobj.in ()
ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
// bind your stringified IOR in the IOR table
table->bind ("LoadManager", str.in () ACE_ENV_ARG_PARAMETER);
ACE_TRY_CHECK;
FILE * lm_ior = ACE_OS::fopen (lm_ior_file.fast_rep(), ACE_TEXT("w"));
ACE_OS::fprintf (lm_ior, "%s", str.in ());
ACE_OS::fclose (lm_ior);
#if defined (linux) && defined (ACE_HAS_THREADS)
if (ACE_Thread_Manager::instance ()->spawn (::TAO_LB_run_load_manager,
orb.in ()) == -1)
{
ACE_ERROR_RETURN ((LM_ERROR,
"ERROR: Unable to spawn TAO LoadManager's "
"ORB thread.\n"),
-1);
}
ACE_Sig_Set sigset;
sigset.sig_add (SIGINT);
sigset.sig_add (SIGTERM);
int signum = -1;
// Block waiting for the registered signals.
if (ACE_OS::sigwait (sigset, &signum) == -1)
{
ACE_ERROR_RETURN ((LM_ERROR,
"(%P|%t) %p\n",
"ERROR waiting on signal"),
-1);
}
ACE_ASSERT (signum == SIGINT || signum == SIGTERM);
#else
// Activate/register the signal handler that (attempts) to
// ensure graceful shutdown of the LoadManager so that remote
// resources created by the LoadManager can be cleaned up.
TAO_LB_Signal_Handler signal_handler (orb.in (), root_poa.in ());
if (signal_handler.activate () != 0)
return -1;
// @@ There is a subtle race condition here. If the signal
// handler thread shuts down the ORB before it is run, the
// below call to ORB::run() will throw a CORBA::BAD_INV_ORDER
// exception.
orb->run (ACE_ENV_SINGLE_ARG_PARAMETER);
ACE_TRY_CHECK;
// Wait for the signal handler thread to finish
// before the process exits.
signal_handler.wait ();
#endif /* linux && ACE_HAS_THREADS */
orb->destroy (ACE_ENV_SINGLE_ARG_PARAMETER);
ACE_TRY_CHECK;
}
// ACE_CATCH (PortableGroup::InvalidProperty, ex)
// {
// ACE_DEBUG ((LM_DEBUG, "Property ----> %s\n", ex.nam[0].id.in ()));
// }
ACE_CATCHANY
{
ACE_PRINT_EXCEPTION (ACE_ANY_EXCEPTION,
"TAO Load Manager");
return -1;
}
ACE_ENDTRY;
return 0;
}
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