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// -*- C++ -*-
// ===================================================================
/**
* @file Transport_Selection_Guard.h
*
* @author Iliyan Jeliazkov <iliyan@ociweb.com>
*/
// ===================================================================
#ifndef TAO_TRANSPORT_SELECTION_GUARD_H
#define TAO_TRANSPORT_SELECTION_GUARD_H
#include /**/ "ace/pre.h"
#include "tao/TAO_Export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "tao/orbconf.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
// Forward declarations
class TAO_Transport;
class TAO_ORB_Core;
namespace TAO
{
/**
* @class Transport_Selection_Guard
*
* @brief Used by the Transport Current feature to keep track of
* which Transport is currently active.
*
* Whenever a Transport is selected: during an upcall, or prior to a
* client invocation an instance of this class is created [on the
* stack, or as a member of another class] to keep track of the said
* Transport. The class implements the RAII idiom, which makes it
* possible to build a stack of these instances as the thread is
* doing nested upcalls or client invocations.
*
* It utilizes TAO_TSS_Resources::tsg_ member pointer to keep track
* of stack-linked Transport_Selection_Guard instances.
*
* If the Transport Current feature is disabled most methods are
* no-ops and add no overhead on the critical path.
*
* <B>See Also:</B>
*
* https://htmlpreview.github.io/?https://github.com/DOCGroup/ACE_TAO/blob/master/TAO/docs/transport_current/index.html
*
*/
class TAO_Export Transport_Selection_Guard
{
public:
static Transport_Selection_Guard* current (TAO_ORB_Core* core,
size_t tss_slot_id);
public:
/// Ctor
Transport_Selection_Guard (TAO_Transport* t);
/// Dtor
~Transport_Selection_Guard ();
/// getter
TAO_Transport* operator-> () const
{
return this->get ();
}
/// getter
TAO_Transport& operator* () const
{
return *this->get ();
}
/// Getter
TAO_Transport* get () const
{
return this->curr_;
}
/// Setter
Transport_Selection_Guard& set (TAO_Transport* t)
{
this->curr_ = t;
return *this;
}
Transport_Selection_Guard& operator=(const Transport_Selection_Guard& rhs) {
if (this != &rhs)
{
#if TAO_HAS_TRANSPORT_CURRENT == 1
prev_ = rhs.prev_;
#endif /* TAO_HAS_TRANSPORT_CURRENT == 1 */
curr_ = rhs.curr_;
}
return *this;
}
private:
Transport_Selection_Guard (const Transport_Selection_Guard&) = delete;
#if TAO_HAS_TRANSPORT_CURRENT == 1
/// This is pointing to the guard that was active prior to
/// instantiating us.
Transport_Selection_Guard* prev_;
#endif /* TAO_HAS_TRANSPORT_CURRENT == 1 */
/// The "real" Transport, i.e. the one selected at present
TAO_Transport* curr_;
friend TAO_Export bool
operator== (const Transport_Selection_Guard& lhs,
const TAO_Transport* rhs);
friend TAO_Export bool
operator== (const TAO_Transport* lhs,
const Transport_Selection_Guard& rhs);
friend TAO_Export bool
operator!= (const Transport_Selection_Guard& lhs,
const TAO_Transport* rhs);
friend TAO_Export bool
operator!= (const TAO_Transport* lhs,
const Transport_Selection_Guard& rhs);
template <class U> inline friend bool
operator== (const Transport_Selection_Guard& lhs,
const U* rhs)
{
return lhs.curr_ == rhs;
}
template <class U> inline friend bool
operator== (const U* lhs,
const Transport_Selection_Guard& rhs)
{
return lhs == rhs.curr_;
}
template <class U> inline friend bool
operator!= (const Transport_Selection_Guard& lhs,
const U* rhs)
{
return lhs.curr_ != rhs;
}
template <class U> inline friend bool
operator!= (const U* lhs,
const Transport_Selection_Guard& rhs)
{
return lhs != rhs.curr_;
}
};
TAO_Export bool
operator== (const Transport_Selection_Guard& lhs,
const TAO_Transport* rhs);
TAO_Export bool
operator== (const TAO_Transport* lhs,
const Transport_Selection_Guard& rhs);
TAO_Export bool
operator!= (const Transport_Selection_Guard& lhs,
const TAO_Transport* rhs);
TAO_Export bool
operator!= (const TAO_Transport* lhs,
const Transport_Selection_Guard& rhs);
} /* namespace TAO */
TAO_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* TAO_TRANSPORT_SELECTION_GUARD_H */
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