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// $Id$
#include "orbsvcs/LoadBalancing/LB_ServerRequestInterceptor.h"
#include "orbsvcs/LoadBalancing/LB_LoadAlert.h"
#include "tao/debug.h"
#include "ace/OS_NS_string.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
TAO_LB_ServerRequestInterceptor::TAO_LB_ServerRequestInterceptor (
TAO_LB_LoadAlert & load_alert)
: load_alert_ (load_alert)
{
}
TAO_LB_ServerRequestInterceptor::~TAO_LB_ServerRequestInterceptor (void)
{
}
char *
TAO_LB_ServerRequestInterceptor::name (void)
{
return CORBA::string_dup ("TAO_LB_ServerRequestInterceptor");
}
void
TAO_LB_ServerRequestInterceptor::destroy (void)
{
}
void
TAO_LB_ServerRequestInterceptor::receive_request_service_contexts (
PortableInterceptor::ServerRequestInfo_ptr ri)
{
if (this->load_alert_.alerted ())
{
CORBA::String_var op = ri->operation ();
if (ACE_OS::strcmp (op.in (), "_get_loads") == 0 // LoadMonitor
|| ACE_OS::strcmp (op.in (), "disable_alert") == 0 // LoadAlert
|| ACE_OS::strcmp (op.in (), "enable_alert") == 0) // LoadAlert
return; // Do not redirect.
#if 0
try
{
IOP::ServiceContext_var service_context =
ri->get_request_service_context (CosLoadBalancing::LOAD_MANAGED);
/*
// Use TAO-specific "compiled marshaling" instead of
// standard interpretive marshaling via a CDR encapsulation
// Codec for efficiency reasons.
const char * buf =
reinterpret_cast<const char *> (service_context->context_data.get_buffer ());
TAO_InputCDR cdr (buf,
service_context->context_data.length ());
CORBA::Boolean byte_order;
if ((cdr >> ACE_InputCDR::to_boolean (byte_order)) == 0)
throw CORBA::BAD_PARAM ();
cdr.reset_byte_order (static_cast<int> (byte_order));
CORBA::Object_var object_group;
if (cdr >> object_group.out ())
throw PortableInterceptor::ForwardRequest (object_group.in (,
0));
else
throw CORBA::BAD_PARAM ();
*/
// A ServiceContext of the given ServiceId exists. This
// means that the target is load balanced. Force the client
// to try another profile since this location is currently
// overloaded.
throw CORBA::TRANSIENT ();
}
catch (const CORBA::BAD_PARAM& ex)
{
// No CosLoadBalancing::LB_GROUP_REF ServiceContext. This
// probably means that the target object is not
// LoadBalanced.
// There is a huge DoS attack vulnerability with this load
// shedding model. The model relies on the client behaving
// correctly. In particular, it relies on the client to
// send the forward object group reference in the
// ServiceContextList. Any "misbehaving" client can avoid
// that, in which case no load will ever be shed!
// Make sure we get a CORBA::BAD_PARAM for the right
// reason.
if (ex.minor () != (CORBA::OMGVMCID | 26))
throw;
}
#else
// Force the client to try another profile since this location
// is currently overloaded.
//
// NOTE: This applies to both load balanced and non-load
// balanced targets.
throw CORBA::TRANSIENT ();
#endif /* 0 */
}
}
void
TAO_LB_ServerRequestInterceptor::receive_request (
PortableInterceptor::ServerRequestInfo_ptr)
{
}
void
TAO_LB_ServerRequestInterceptor::send_reply (
PortableInterceptor::ServerRequestInfo_ptr /* ri */)
{
}
void
TAO_LB_ServerRequestInterceptor::send_exception (
PortableInterceptor::ServerRequestInfo_ptr)
{
if (TAO_debug_level > 0)
{
// A CORBA::TRANSIENT is thrown when the LoadManager informs the
// LoadAlert object that its member is overloaded, for example.
ACE_DEBUG ((LM_INFO,
ACE_TEXT ("TAO_LB_ServerRequestInterceptor -- ")
ACE_TEXT ("Exception thrown.\n")));
}
}
void
TAO_LB_ServerRequestInterceptor::send_other (
PortableInterceptor::ServerRequestInfo_ptr ri)
{
if (TAO_debug_level > 0)
{
// A location forward occurs when the LoadManager informs the
// LoadAlert object that its member is overloaded, for example.
const PortableInterceptor::ReplyStatus status =
ri->reply_status ();
if (status == PortableInterceptor::LOCATION_FORWARD)
ACE_DEBUG ((LM_INFO,
ACE_TEXT ("TAO_LB_ServerRequestInterceptor -- ")
ACE_TEXT ("LOCATION FORWARDED\n")));
}
}
TAO_END_VERSIONED_NAMESPACE_DECL
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