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// -*- C++ -*-
#include "LB_Redirect_Table.h"
#include "tao/Object.h"
#include "tao/Exception.h"
#include "tao/Environment.h"
#include "tao/CORBA_String.h"
#include "tao/debug.h"
ACE_RCSID (LoadBalancing,
LB_Redirect_Table,
"$Id$")
// ****************************************************************
TAO_LB_Redirect_Table::TAO_LB_Redirect_Table (void)
: table_ ()
{
}
TAO_LB_Redirect_Table::~TAO_LB_Redirect_Table (void)
{
// Must explicitly call destroy() in the destructor since not all
// applications will invoke ORB::shutdown() or ORB::destroy().
this->destroy ();
}
void
TAO_LB_Redirect_Table::register_redirect (
const char *type_id,
CORBA::Object_ptr redirect_to,
CORBA::Environment &ACE_TRY_ENV)
{
// The RepositoryId should never be zero since it is not possible to
// send a NULL string as an "in" argument.
if (ACE_OS_String::strlen (id) == 0)
ACE_THROW (CORBA::BAD_PARAM ());
if (CORBA::is_nil (obj))
ACE_THROW (CORBA::BAD_PARAM ());
int result = this->bind (type_id, redirect_to);
if (result == 1)
{
if (TAO_debug_level > 1)
ACE_ERROR ((LM_ERROR,
"(%P|%t) LB_Redirect_Table::register_redirect:\n"
" Could not register duplicate object <%s> with "
"the LB_Redirect_Table\n",
type_id));
ACE_THROW (CORBA::INV_OBJREF ());
}
if (result == -1)
{
if (TAO_debug_level > 1)
ACE_ERROR ((LM_ERROR,
"(%P|%t) LB_Redirect_Table::register_redirect:\n"
" Could not register redirect object <%s> with "
"the LB_Redirect_Table\n",
type_id));
ACE_THROW (CORBA::INTERNAL ());
}
}
void
TAO_LB_Redirect_Table::find_redirect (
PortableInterceptor::ServerRequestInfo_ptr ri,
CORBA::Environment &ACE_TRY_ENV)
{
// This could become very slow if there are many type of targets
// being redirected since we're doing a linear search using string
// comparisons.
//
// We do things this way to avoid the memory allocation that would
// occur if we were to just use the
// ServerRequestInfo::target_most_derived_interface() method. At
// some point, there is a threshold reached where the cost of the
// iteration through the redirect table is more expensive than the
// allocation incurred by calling
// ServerRequestInfo::target_most_derived_interface(). That
// threshold is approached as the number of redirects in the table
// becomes "large." For now, we optimize for the common case and
// assume that only a few types of targets (i.e. objects/servants
// with different RepositoryIds) exist at the current location.
//
// Note that if no redirects are registered, then this method
// basically becomes a no-op.
for (Table::iterator i = this->table_.begin ();
i != this->table_.end ();
++i)
{
// Compare the target's RepositoryId with the registered
// redirects.
CORBA::Boolean matched =
ri->target_is_a ((*i).ext_id_, ACE_TRY_ENV);
ACE_CHECK_RETURN (0);
if (matched)
ACE_THROW (PortableInterceptor::ForwardRequest (
(*i).int_id_,
0 /* non-permanent forward */));
}
}
int
TAO_LB_Redirect_Table::remove_redirect (const char *type_id,
CORBA::Environment &ACE_TRY_ENV)
{
Table::ENTRY *entry = 0;
int result = this->table_.find (type_id, entry);
if (result == 0)
{
// Deallocate the external ID and obtain the ORB core pointer
// before unbinding the entry since the entry is deallocated
// during the call to unbind().
CORBA::string_free (ACE_const_cast (char *, entry->ext_id_));
CORBA::Object_ptr redirect = entry->int_id_;
result = this->table_.unbind (entry);
if (result != 0)
return result;
CORBA::release (redirect);
}
return result;
}
void
TAO_LB_Redirect_Table::destroy (void)
{
for (Table::iterator i = this->table_.begin ();
i != this->table_.end ();
++i)
{
// Deallocate the id.
CORBA::string_free (ACE_const_cast (char *, (*i).ext_id_));
// Release the Object.
CORBA::release ((*i).int_id_);
}
this->table_.unbind_all ();
}
int
TAO_LB_Redirect_Table::bind (const char *id,
CORBA::Object_ptr obj)
{
// Make sure that the supplied Object reference is valid,
// i.e. not nil.
if (id == 0 || CORBA::is_nil (obj))
{
errno = EINVAL;
return -1;
};
CORBA::String_var type_id = CORBA::string_dup (id);
CORBA::Object_var redirect = CORBA::Object::_duplicate (obj);
int result = this->table_.bind (type_id.in (),
redirect.in ());
if (result == 0)
{
// Transfer ownership to the Object Table.
(void) type_id._retn ();
(void) redirect._retn ();
}
return result;
}
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