Imported existing code

indra/llcommon/lllivefile.h

@@ -0,0 +1,63 @@
+/** 
+ * @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
+
+const F32 configFileRefreshRate = 5.0; // seconds
+
+
+class LLLiveFile
+{
+public:
+	LLLiveFile(const std::string &filename, const F32 refresh_period = 5.f);
+	virtual ~LLLiveFile();
+
+	bool checkAndReload();
+		// Returns true if the file changed in any way
+		// Call this before using anything that was read & cached from the file
+
+	std::string filename() const;
+
+	void addToEventTimer();
+		// Normally, just calling checkAndReload() is enough.  In some cases
+		// though, you may need to let the live file periodically check itself.
+
+protected:
+	virtual void loadFile() = 0; // Implement this to load your file if it changed
+
+private:
+	class Impl;
+	Impl& impl;
+};
+
+#endif //LL_LLLIVEFILE_H