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/**
* @file lllivefile.cpp
*
* Copyright (c) 2006-2007, Linden Research, Inc.
*
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
*/
#include "linden_common.h"
#include "lllivefile.h"
#include "llframetimer.h"
#include "lltimer.h"
class LLLiveFile::Impl
{
public:
Impl(const std::string &filename, const F32 refresh_period);
~Impl();
bool check();
bool mForceCheck;
F32 mRefreshPeriod;
LLFrameTimer mRefreshTimer;
std::string mFilename;
time_t mLastModTime;
bool mLastExists;
LLEventTimer* mEventTimer;
};
LLLiveFile::Impl::Impl(const std::string &filename, const F32 refresh_period)
: mForceCheck(true),
mRefreshPeriod(refresh_period),
mFilename(filename),
mLastModTime(0),
mLastExists(false),
mEventTimer(NULL)
{
}
LLLiveFile::Impl::~Impl()
{
delete mEventTimer;
}
LLLiveFile::LLLiveFile(const std::string &filename, const F32 refresh_period)
: impl(* new Impl(filename, refresh_period))
{
}
LLLiveFile::~LLLiveFile()
{
delete &impl;
}
bool LLLiveFile::Impl::check()
{
if (!mForceCheck && mRefreshTimer.getElapsedTimeF32() < mRefreshPeriod)
{
// Skip the check if not enough time has elapsed and we're not
// forcing a check of the file
return false;
}
mForceCheck = false;
mRefreshTimer.reset();
// Stat the file to see if it exists and when it was last modified.
llstat stat_data;
int res = LLFile::stat(mFilename.c_str(), &stat_data);
if (res)
{
// Couldn't stat the file, that means it doesn't exist or is
// broken somehow. Clear flags and return.
if (mLastExists)
{
mLastExists = false;
return true; // no longer existing is a change!
}
return false;
}
// The file exists, decide if we want to load it.
if (mLastExists)
{
// The file existed last time, don't read it if it hasn't changed since
// last time.
if (stat_data.st_mtime <= mLastModTime)
{
return false;
}
}
// We want to read the file. Update status info for the file.
mLastExists = true;
mLastModTime = stat_data.st_mtime;
return true;
}
bool LLLiveFile::checkAndReload()
{
bool changed = impl.check();
if (changed)
{
loadFile();
}
return changed;
}
std::string LLLiveFile::filename() const
{
return impl.mFilename;
}
namespace
{
class LiveFileEventTimer : public LLEventTimer
{
public:
LiveFileEventTimer(LLLiveFile& f, F32 refresh)
: LLEventTimer(refresh), mLiveFile(f)
{ }
void tick()
{ mLiveFile.checkAndReload(); }
private:
LLLiveFile& mLiveFile;
};
}
void LLLiveFile::addToEventTimer()
{
impl.mEventTimer = new LiveFileEventTimer(*this, impl.mRefreshPeriod);
}
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