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// -*- C++ -*-
//=============================================================================
/**
* @file Resume_Handle.h
*
* $Id$
*
* @author Balachandran Natarajan <bala@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_RESUME_HANDLE_H
#define TAO_RESUME_HANDLE_H
#include /**/ "ace/pre.h"
#include "TAO_Export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
class TAO_ORB_Core;
/**
* @class TAO_Resume_Handle
*
* @brief A utility class that helps in resuming handlers if TAO uses
* a TP Reactor from ACE.
*
* Please read the documentation in the bugzilla #575 in the bugzilla
* database what we mean by handler resumption.
*
* When TAO uses a TP reactor, it takes care of resuming the handler
* once it makes sure that it has read the whole message out of the
* socket. During the process of reading the transport object would
* have to deal with errors in 'read' from the socket, or errors in
* the messages that has been received. Instead of calling
* resume_handler () on the reactor at every point in the code, we
* use this utility class to take care of the resumption.
*/
class TAO_Export TAO_Resume_Handle
{
public:
/// Ctor.
TAO_Resume_Handle (TAO_ORB_Core *orb_core = 0,
ACE_HANDLE h = ACE_INVALID_HANDLE);
/// Dtor
~TAO_Resume_Handle (void);
enum TAO_Handle_Resume_Flag
{
TAO_HANDLE_RESUMABLE = 0,
TAO_HANDLE_ALREADY_RESUMED,
TAO_HANDLE_LEAVE_SUSPENDED
};
/// Allow the users of this class to change the underlying flag.
void set_flag (TAO_Handle_Resume_Flag fl);
/// Equal to operator..
TAO_Resume_Handle &operator= (const TAO_Resume_Handle &rhs);
/// Resume the handle in the reactor only if the ORB uses a TP
/// reactor. Else we dont resume the handle.
void resume_handle (void);
private:
/// Our ORB Core.
TAO_ORB_Core *orb_core_;
/// The actual handle that needs resumption..
ACE_HANDLE handle_;
/// The flag for indicating whether the handle has been resumed or
/// not. A value of '0' indicates that the handle needs resumption.
TAO_Handle_Resume_Flag flag_;
};
#if defined (__ACE_INLINE__)
# include "Resume_Handle.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /*TAO_RESUME_HANDLE*/
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