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/**
* @file lllivefile.cpp
*
* $LicenseInfo:firstyear=2006&license=viewerlgpl$
* 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
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "lllivefile.h"
#include "llframetimer.h"
#include "lleventtimer.h"
const F32 DEFAULT_CONFIG_FILE_REFRESH = 5.0f;
class LLLiveFile::Impl
{
public:
Impl(const std::string& filename, const F32 refresh_period);
~Impl();
bool check();
void changed();
bool mForceCheck;
F32 mRefreshPeriod;
LLFrameTimer mRefreshTimer;
std::string mFilename;
time_t mLastModTime;
time_t mLastStatTime;
bool mLastExists;
LLEventTimer* mEventTimer;
private:
LOG_CLASS(LLLiveFile);
};
LLLiveFile::Impl::Impl(const std::string& filename, const F32 refresh_period)
:
mForceCheck(true),
mRefreshPeriod(refresh_period),
mFilename(filename),
mLastModTime(0),
mLastStatTime(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()
{
bool detected_change = false;
// Skip the check if not enough time has elapsed and we're not
// forcing a check of the file
if (mForceCheck || mRefreshTimer.getElapsedTimeF32() >= mRefreshPeriod)
{
mForceCheck = false; // force only forces one check
mRefreshTimer.reset(); // don't check again until mRefreshPeriod has passed
// Stat the file to see if it exists and when it was last modified.
llstat stat_data;
if (LLFile::stat(mFilename, &stat_data))
{
// Couldn't stat the file, that means it doesn't exist or is
// broken somehow.
if (mLastExists)
{
mLastExists = false;
detected_change = true; // no longer existing is a change!
LL_DEBUGS() << "detected deleted file '" << mFilename << "'" << LL_ENDL;
}
}
else
{
// The file exists
if ( ! mLastExists )
{
// last check, it did not exist - that counts as a change
LL_DEBUGS() << "detected created file '" << mFilename << "'" << LL_ENDL;
detected_change = true;
}
else if ( stat_data.st_mtime > mLastModTime )
{
// file modification time is newer than last check
LL_DEBUGS() << "detected updated file '" << mFilename << "'" << LL_ENDL;
detected_change = true;
}
mLastExists = true;
mLastStatTime = stat_data.st_mtime;
}
}
if (detected_change)
{
LL_INFOS() << "detected file change '" << mFilename << "'" << LL_ENDL;
}
return detected_change;
}
void LLLiveFile::Impl::changed()
{
// we wanted to read this file, and we were successful.
mLastModTime = mLastStatTime;
}
bool LLLiveFile::checkAndReload()
{
bool changed = impl.check();
if (changed)
{
if(loadFile())
{
impl.changed();
this->changed();
}
else
{
changed = false;
}
}
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)
{ }
bool tick()
{
mLiveFile.checkAndReload();
return false;
}
private:
LLLiveFile& mLiveFile;
};
}
void LLLiveFile::addToEventTimer()
{
impl.mEventTimer = new LiveFileEventTimer(*this, impl.mRefreshPeriod);
}
void LLLiveFile::setRefreshPeriod(F32 seconds)
{
if (seconds < 0.f)
{
seconds = -seconds;
}
impl.mRefreshPeriod = seconds;
}
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