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+/** 
+ * @file llinventorymodelbackgroundfetch.h
+ * @brief LLInventoryModelBackgroundFetch class header file
+ *
+ * $LicenseInfo:firstyear=2002&license=viewergpl$
+ * 
+ * Copyright (c) 2002-2009, 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_LLINVENTORYMODELBACKGROUNDFETCH_H
+#define LL_LLINVENTORYMODELBACKGROUNDFETCH_H
+
+#include "llsingleton.h"
+#include "lluuid.h"
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLInventoryModelBackgroundFetch
+//
+// This class handles background fetches, which are fetches of
+// inventory folder.  Fetches can be recursive or not.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+class LLInventoryModelBackgroundFetch : public LLSingleton<LLInventoryModelBackgroundFetch>
+{
+	friend class LLInventoryModelFetchDescendentsResponder;
+
+public:
+	LLInventoryModelBackgroundFetch();
+	~LLInventoryModelBackgroundFetch();
+
+	// Start and stop background breadth-first fetching of inventory contents.
+	// This gets triggered when performing a filter-search.
+	void start(const LLUUID& cat_id = LLUUID::null, BOOL recursive = TRUE);
+
+	BOOL backgroundFetchActive() const;
+	bool isEverythingFetched() const; // completing the fetch once per session should be sufficient
+
+	bool libraryFetchStarted() const;
+	bool libraryFetchCompleted() const;
+	bool libraryFetchInProgress() const;
+	
+	bool inventoryFetchStarted() const;
+	bool inventoryFetchCompleted() const;
+	bool inventoryFetchInProgress() const;
+
+    void findLostItems();	
+protected:
+	void incrBulkFetch(S16 fetching);
+	bool isBulkFetchProcessingComplete() const;
+	void bulkFetch(std::string url);
+
+	void backgroundFetch();
+	static void backgroundFetchCB(void*); // background fetch idle function
+	void stopBackgroundFetch(); // stop fetch process
+
+	void setAllFoldersFetched();
+	bool fetchQueueContainsNoDescendentsOf(const LLUUID& cat_id) const;
+private:
+ 	BOOL mRecursiveInventoryFetchStarted;
+	BOOL mRecursiveLibraryFetchStarted;
+	BOOL mAllFoldersFetched;
+
+	BOOL mBackgroundFetchActive;
+	S16 mBulkFetchCount;
+	BOOL mTimelyFetchPending;
+	S32 mNumFetchRetries;
+
+	LLFrameTimer mFetchTimer;
+	F32 mMinTimeBetweenFetches;
+	F32 mMaxTimeBetweenFetches;
+
+	struct FetchQueueInfo
+	{
+		FetchQueueInfo(const LLUUID& id, BOOL recursive) :
+			mCatUUID(id), mRecursive(recursive)
+		{
+		}
+		LLUUID mCatUUID;
+		BOOL mRecursive;
+	};
+	typedef std::deque<FetchQueueInfo> fetch_queue_t;
+	fetch_queue_t mFetchQueue;
+};
+
+#endif // LL_LLINVENTORYMODELBACKGROUNDFETCH_H
+