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// -*- IDL -*-
//=============================================================================
/**
* @file FT_FaultDetectorFactory.idl
*
* $Id$
*
* @author: Dale Wilson, OCI <wilson_d@ociweb.com>
*/
//=============================================================================
#ifndef _FT_DETECTOR_FACTORY_IDL_
#define _FT_DETECTOR_FACTORY_IDL_
// A TAO specific addition to FT_CORBA.
// No interface was specified for the FaultDetector
// in the FT CORBA specification, so we decided to
// define a GenericFactory to create FaultDetectors and
// control the FaultDetectors through the GenericFactory
// interface (with extenstions.)
#pragma prefix "omg.org"
#include "orbsvcs/FT_CORBA.idl"
#include "orbsvcs/FT_Replica.idl"
#include "orbsvcs/PortableGroup.idl"
module FT
{
///////////////////////////////////////////////////
// names for properties used in Fault Tolerant CORBA
/// TimeBase::TimeT how often to call is_alive();
const string FT_FAULT_MONITORING_INTERVAL = "MonitoringInterval";
/// FT::FaultNotifier where to send fault reports
const string FT_NOTIFIER = "Notifier";
/// FT::PullMonitorable the object to monitor
const string FT_MONITORABLE = "Monitorable";
///////////////////////////////////////////
// Names specified in the FT CORBA specification
const string FT_EVENT_TYPE_DOMAIN = "FT_CORBA";
const string FT_EVENT_TYPE_NAME = "ObjectCrashFault";
/// FT::FTDomainId domain to report to notifier
const string FT_DOMAIN_ID = "FTDomainId";
/// FT::Location location to report to notifier
const string FT_LOCATION = "Location";
/// FT::TypeId type to report to notifier
const string FT_TYPE_ID = "TypeId";
/// FT::ObjectGroupId group to report to notifier
const string FT_GROUP_ID = "GroupId";
// end of names from FT CORBA specification
///////////////////////////////////////////
/**
* A FaultDetectorFactory creates and manages a set of FaultDetectors.
*
* A FaultDetectorFactory acts as an agent for a ReplicationManager
* which needs to create one or more FaultDetectors at a particular
* location.
*
* At present, FaultDetectors monitor via the is_alive() method of
* the PullMonitorable interface which must be implemented by the
* object-to-be-monitored. Other monitoring techniques may be
* supported in the future. In particular heartbeat/watchdog
* monitoring is anticipated.
*
* Notifications of failing objects are sent to a FaultNotifier
* which is responsible for distributing them to interested parties.
*
* The implementation of the GenericFactory::create_object method
* creates a FaultDetector object to monitor a single monitorable.
* The FaultDetector is *not* a first-class CORBA object. The
* Object reference returned by create_object will be nil. You
* cannot interact directly with a FaultDetector.
* The only interaction that a FaultDetector needs after it is
* started is to tell it to change it's monitoring parameters,
* or to shut down. The change_properties () and shutdown ()
* methods on the Factory provide the needed capabilities.
*
* The create_object requires the following criteria:
* FT::Notifier Notifier
* FT::PullMonitorable Monitorable
* FT::DomainId domain_id,
* FT::ObjectGroupId group_id,
* FT::Location object_location,
* FT::_TypeId object_type
*/
interface FaultDetectorFactory : GenericFactory, PullMonitorable
{
/**
* Adjust properties on-the-fly.
* Applies to all FaultDetectors created by this factory.
* @param property_set is a set of properties that (may) have new values.
*/
void change_properties(in Properties property_set)
raises (PortableGroup::InvalidProperty);
/**
* Ask the Fault Detector Factory to come to an orderly end.
*/
oneway void shutdown();
};
};
#endif // for #ifndef _FT_DETECTOR_FACTORY_IDL_
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