170 lines
3.7 KiB
C++
170 lines
3.7 KiB
C++
/**
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* @file lllivefile.cpp
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*
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* $LicenseInfo:firstyear=2006&license=viewergpl$
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*
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* Copyright (c) 2006-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#include "linden_common.h"
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#include "lllivefile.h"
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#include "llframetimer.h"
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#include "lltimer.h"
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class LLLiveFile::Impl
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{
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public:
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Impl(const std::string &filename, const F32 refresh_period);
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~Impl();
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bool check();
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bool mForceCheck;
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F32 mRefreshPeriod;
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LLFrameTimer mRefreshTimer;
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std::string mFilename;
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time_t mLastModTime;
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bool mLastExists;
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LLEventTimer* mEventTimer;
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};
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LLLiveFile::Impl::Impl(const std::string &filename, const F32 refresh_period)
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: mForceCheck(true),
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mRefreshPeriod(refresh_period),
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mFilename(filename),
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mLastModTime(0),
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mLastExists(false),
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mEventTimer(NULL)
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{
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}
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LLLiveFile::Impl::~Impl()
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{
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delete mEventTimer;
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}
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LLLiveFile::LLLiveFile(const std::string &filename, const F32 refresh_period)
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: impl(* new Impl(filename, refresh_period))
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{
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}
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LLLiveFile::~LLLiveFile()
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{
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delete &impl;
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}
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bool LLLiveFile::Impl::check()
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{
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if (!mForceCheck && mRefreshTimer.getElapsedTimeF32() < mRefreshPeriod)
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{
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// Skip the check if not enough time has elapsed and we're not
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// forcing a check of the file
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return false;
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}
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mForceCheck = false;
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mRefreshTimer.reset();
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// Stat the file to see if it exists and when it was last modified.
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llstat stat_data;
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int res = LLFile::stat(mFilename, &stat_data);
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if (res)
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{
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// Couldn't stat the file, that means it doesn't exist or is
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// broken somehow. Clear flags and return.
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if (mLastExists)
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{
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mLastExists = false;
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return true; // no longer existing is a change!
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}
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return false;
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}
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// The file exists, decide if we want to load it.
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if (mLastExists)
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{
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// The file existed last time, don't read it if it hasn't changed since
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// last time.
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if (stat_data.st_mtime <= mLastModTime)
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{
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return false;
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}
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}
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// We want to read the file. Update status info for the file.
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mLastExists = true;
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mLastModTime = stat_data.st_mtime;
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return true;
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}
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bool LLLiveFile::checkAndReload()
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{
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bool changed = impl.check();
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if (changed)
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{
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loadFile();
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}
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return changed;
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}
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std::string LLLiveFile::filename() const
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{
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return impl.mFilename;
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}
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namespace
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{
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class LiveFileEventTimer : public LLEventTimer
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{
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public:
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LiveFileEventTimer(LLLiveFile& f, F32 refresh)
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: LLEventTimer(refresh), mLiveFile(f)
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{ }
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BOOL tick()
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{
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mLiveFile.checkAndReload();
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return FALSE;
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}
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private:
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LLLiveFile& mLiveFile;
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};
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}
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void LLLiveFile::addToEventTimer()
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{
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impl.mEventTimer = new LiveFileEventTimer(*this, impl.mRefreshPeriod);
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}
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