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// -*- C++ -*-
/**
* @file ESF_Proxy_RefCount_Guard.h
*
* @author Carlos O'Ryan (coryan@cs.wustl.edu)
*
* http://doc.ece.uci.edu/~coryan/EC/index.html
*/
#ifndef TAO_ESF_PROXY_REFCOUNT_GUARD_H
#define TAO_ESF_PROXY_REFCOUNT_GUARD_H
#include "tao/Basic_Types.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class TAO_ESF_Proxy_RefCount_Guard
*
* @brief Reference count based guard.
*
* A common idiom used on event services is to increment a
* reference count before starting a long running operation.
* The system can then execute the operation without any risk of
* having the underlying object destroyed. The advantage of using
* a reference count is that no mutex or lock needs to be held
* while the operation is being executed.
* This class implements that common idiom, but it also adds hooks
* to handle scenarios where more than one operation is performed
* while holding the reference count.
*
* @todo The type of lock could be parametric
*/
template<class EVENT_CHANNEL, class PROXY>
class TAO_ESF_Proxy_RefCount_Guard
{
public:
/// Constructor
TAO_ESF_Proxy_RefCount_Guard (CORBA::ULong &refcount,
EVENT_CHANNEL *ec,
PROXY *proxy);
/// Destructor
~TAO_ESF_Proxy_RefCount_Guard ();
protected:
/// The reference count, if it gets to zero then the object must be
/// destroyed
CORBA::ULong &refcount_;
/// The event channel used to destroy the proxy
EVENT_CHANNEL *event_channel_;
/// The proxy whose lifetime is controlled by the reference count
PROXY *proxy_;
};
TAO_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "orbsvcs/ESF/ESF_Proxy_RefCount_Guard.inl"
#endif /* __ACE_INLINE__ */
#include "orbsvcs/ESF/ESF_Proxy_RefCount_Guard.cpp"
#endif /* TAO_ESF_PROXY_REFCOUNT_GUARD_H */
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