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/**
* @file lllivefile.h
* @brief Automatically reloads a file whenever it changes or is removed.
*
* $LicenseInfo:firstyear=2006&license=viewergpl$
*
* Copyright (c) 2006-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* 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://secondlifegrid.net/programs/open_source/licensing/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://secondlifegrid.net/programs/open_source/licensing/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.
* $/LicenseInfo$
*/
#ifndef LL_LLLIVEFILE_H
#define LL_LLLIVEFILE_H
extern const F32 DEFAULT_CONFIG_FILE_REFRESH;
class LL_COMMON_API LLLiveFile
{
public:
LLLiveFile(const std::string& filename, const F32 refresh_period = 5.f);
virtual ~LLLiveFile();
/**
* @brief Check to see if this live file should reload.
*
* Call this before using anything that was read & cached
* from the file.
*
* This method calls the <code>loadFile()</code> method if
* any of:
* file has a new modify time since the last check
* file used to exist and now does not
* file used to not exist but now does
* @return Returns true if the file was reloaded.
*/
bool checkAndReload();
std::string filename() const;
/**
* @brief Add this live file to an automated recheck.
*
* Normally, just calling checkAndReload() is enough. In some
* cases though, you may need to let the live file periodically
* check itself.
*/
void addToEventTimer();
void setRefreshPeriod(F32 seconds);
protected:
/**
* @breif Implement this to load your file if it changed.
*
* This method is called automatically by <code>checkAndReload()</code>,
* so though you must implement this in derived classes, you do
* not need to call it manually.
* @return Returns true if the file was successfully loaded.
*/
virtual bool loadFile() = 0;
/**
* @brief Implement this method if you want to get a change callback.
*
* This virtual function will be called automatically at the end
* of <code>checkAndReload()</code> if a new configuration was
* loaded. This does not track differences between the current and
* newly loaded file, so any successful load event will trigger a
* <code>changed()</code> callback. Default is to do nothing.
*/
virtual void changed() {}
private:
class Impl;
Impl& impl;
};
#endif //LL_LLLIVEFILE_H
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