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// -*- C++ -*-
//=============================================================================
/**
* @file Countdown_Time_T.h
*
* @author Douglas C. Schmidt <d.schmidt@vanderbilt.edu>
*/
//=============================================================================
#ifndef ACE_COUNTDOWN_TIME_T_H
#define ACE_COUNTDOWN_TIME_T_H
#include /**/ "ace/pre.h"
#include /**/ "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Time_Value.h"
#include "ace/Time_Policy.h"
#include "ace/Copy_Disabled.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Countdown_Time
*
* @brief Keeps track of the amount of elapsed time.
*
* This class has a side-effect on the @c max_wait_time -- every
* time the stop() method is called the @c max_wait_time is
* updated.
*/
template <typename TIME_POLICY = ACE_Default_Time_Policy>
class ACE_Countdown_Time_T : private ACE_Copy_Disabled
{
public:
/// Cache the @a max_wait_time and call @c start().
ACE_Countdown_Time_T (ACE_Time_Value *max_wait_time,
TIME_POLICY const & time_policy = TIME_POLICY());
/// Destructor, makes sure the max_wait_time that got passed as pointer
/// to the constructor is updated with the time elapsed.
~ACE_Countdown_Time_T ();
/// Cache the current time and enter a start state.
void start ();
/// Subtract the elapsed time from max_wait_time_ and enter a stopped
/// state.
void stop ();
/// Calls stop and then start. max_wait_time_ is modified by the
/// call to stop.
void update ();
/// Returns true if we've already been stopped, else false.
bool stopped () const;
/// Allows applications to control how the timer queue gets the time
/// of day.
void set_time_policy(TIME_POLICY const & time_policy);
private:
/// The policy to return the current time of day
TIME_POLICY time_policy_;
/// Maximum time we are monitoring
ACE_Time_Value *max_wait_time_;
/// Copy of the maximum time value, used to avoid nested decrements
ACE_Time_Value max_wait_value_;
/// Beginning of the start time.
ACE_Time_Value start_time_;
/// Keeps track of whether we've already been stopped.
bool stopped_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#if defined (__ACE_INLINE__)
#include "ace/Countdown_Time_T.inl"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Countdown_Time_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Countdown_Time_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* ACE_COUNTDOWN_TIME_T_H */
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