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/**
* @file lleventtimer.h
* @brief Cross-platform objects for doing timing
*
* $LicenseInfo:firstyear=2000&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_EVENTTIMER_H
#define LL_EVENTTIMER_H
#include "stdtypes.h"
#include "lldate.h"
#include "llinstancetracker.h"
#include "lltimer.h"
// class for scheduling a function to be called at a given frequency (approximate, inprecise)
class LL_COMMON_API LLEventTimer : public LLInstanceTracker<LLEventTimer>
{
public:
LLEventTimer(F32 period); // period is the amount of time between each call to tick() in seconds
LLEventTimer(const LLDate& time);
virtual ~LLEventTimer();
//function to be called at the supplied frequency
// Normally return FALSE; TRUE will delete the timer after the function returns.
virtual bool tick() = 0;
static void updateClass();
/// Schedule recurring calls to generic callable every period seconds.
/// Returns a pointer; if you delete it, cancels the recurring calls.
template <typename CALLABLE>
static LLEventTimer* run_every(F32 period, const CALLABLE& callable);
/// Schedule a future call to generic callable. Returns a pointer.
/// CAUTION: The object referenced by that pointer WILL BE DELETED once
/// the callback has been called! LLEventTimer::getInstance(pointer) (NOT
/// pointer->getInstance(pointer)!) can be used to test whether the
/// pointer is still valid. If it is, deleting it will cancel the
/// callback.
template <typename CALLABLE>
static LLEventTimer* run_at(const LLDate& time, const CALLABLE& callable);
/// Like run_at(), but after a time delta rather than at a timestamp.
/// Same CAUTION.
template <typename CALLABLE>
static LLEventTimer* run_after(F32 interval, const CALLABLE& callable);
protected:
LLTimer mEventTimer;
F32 mPeriod;
private:
template <typename CALLABLE>
class Generic;
};
template <typename CALLABLE>
class LLEventTimer::Generic: public LLEventTimer
{
public:
// making TIME generic allows engaging either LLEventTimer constructor
template <typename TIME>
Generic(const TIME& time, bool once, const CALLABLE& callable):
LLEventTimer(time),
mOnce(once),
mCallable(callable)
{}
bool tick() override
{
mCallable();
// true tells updateClass() to delete this instance
return mOnce;
}
private:
bool mOnce;
CALLABLE mCallable;
};
template <typename CALLABLE>
LLEventTimer* LLEventTimer::run_every(F32 period, const CALLABLE& callable)
{
// return false to schedule recurring calls
return new Generic<CALLABLE>(period, false, callable);
}
template <typename CALLABLE>
LLEventTimer* LLEventTimer::run_at(const LLDate& time, const CALLABLE& callable)
{
// return true for one-shot callback
return new Generic<CALLABLE>(time, true, callable);
}
template <typename CALLABLE>
LLEventTimer* LLEventTimer::run_after(F32 interval, const CALLABLE& callable)
{
// one-shot callback after specified interval
return new Generic<CALLABLE>(interval, true, callable);
}
#endif //LL_EVENTTIMER_H
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