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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>
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, bool usePeopleAPI);
void cleanupClass();
// Import/export the name cache to file.
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, i.e. are we trying to use the
// more recent display name lookup system?
bool hasNameLookupURL();
bool usePeopleAPI();
// Periodically makes a batch request for display names not already in
// cache. Called 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;
typedef boost::signals2::connection callback_connection_t;
// Fetches name information and calls callbacks.
// If name information is in cache, callbacks will be called immediately.
callback_connection_t get(const LLUUID& agent_id, callback_slot_t slot);
// Set display name: flips the switch and triggers the callbacks.
void setUseDisplayNames(bool use);
void insert(const LLUUID& agent_id, const LLAvatarName& av_name);
void erase(const LLUUID& agent_id);
/// Provide some fallback for agents that return errors.
void handleAgentError(const LLUUID& agent_id);
// Compute name expiration time from HTTP Cache-Control header,
// or return default value, in seconds from epoch.
F64 nameExpirationFromHeaders(const 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
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