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diff --git a/linden/indra/llmessage/llavatarnamecache.h b/linden/indra/llmessage/llavatarnamecache.h
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+++ b/linden/indra/llmessage/llavatarnamecache.h
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+/** 
+ * @file llavatarnamecache.h
+ * @brief Provides lookup of avatar SLIDs ("bobsmith123") and display names
+ * ("James Cook") from avatar UUIDs.
+ *
+ * $LicenseInfo:firstyear=2010&license=viewerlgpl$
+ * 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
+ * $/LicenseInfo$
+ */
+
+#ifndef LLAVATARNAMECACHE_H
+#define LLAVATARNAMECACHE_H
+
+#include "llavatarname.h"       // for convenience
+
+#include <boost/signals2.hpp>
+
+// We have display names support (this is for use by patches)
+#define LL_DISPLAY_NAMES
+
+class LLSD;
+class LLUUID;
+
+namespace LLAvatarNameCache
+{
+                
+        typedef boost::signals2::signal<void (void)> use_display_name_signal_t;
+
+        // Until the cache is set running, immediate lookups will fail and
+        // async lookups will be queued.  This allows us to block requests
+        // until we know if the first region supports display names.
+        void initClass(bool running);
+        void cleanupClass();
+
+        void importFile(std::istream& istr);
+        void exportFile(std::ostream& ostr);
+
+        // On the viewer, usually a simulator capabilitity
+        // If empty, name cache will fall back to using legacy name
+        // lookup system
+        void setNameLookupURL(const std::string& name_lookup_url);
+
+        // Do we have a valid lookup URL, hence are we trying to use the
+        // new display name lookup system?
+        bool hasNameLookupURL();
+        
+        // Periodically makes a batch request for display names not already in
+        // cache.  Call once per frame.
+        void idle();
+
+        // If name is in cache, returns true and fills in provided LLAvatarName
+        // otherwise returns false
+        bool get(const LLUUID& agent_id, LLAvatarName *av_name);
+
+        // Callback types for get() below
+        typedef boost::signals2::signal<
+                void (const LLUUID& agent_id, const LLAvatarName& av_name)>
+                        callback_signal_t;
+        typedef callback_signal_t::slot_type callback_slot_t;
+
+        // Fetches name information and calls callback.
+        // If name information is in cache, callback will be called immediately.
+        void get(const LLUUID& agent_id, callback_slot_t slot);
+
+        void setUseDisplayNames(U32 use);
+        U32 useDisplayNames();
+
+        void erase(const LLUUID& agent_id);
+
+        // Force a re-fetch of the most recent data, but keep the current
+        // data in cache
+        void fetch(const LLUUID& agent_id);
+
+        void insert(const LLUUID& agent_id, const LLAvatarName& av_name);
+
+        // Compute name expiration time from HTTP Cache-Control header,
+        // or return default value, in seconds from epoch.
+        F64 nameExpirationFromHeaders(LLSD headers);
+
+        void addUseDisplayNamesCallback(const use_display_name_signal_t::slot_type& cb);
+}
+
+// Parse a cache-control header to get the max-age delta-seconds.
+// Returns true if header has max-age param and it parses correctly.
+// Exported here to ease unit testing.
+bool max_age_from_cache_control(const std::string& cache_control, S32 *max_age);
+
+#endif