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/**
* @file llcachename.h
* @brief A cache of names from UUIDs.
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* 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 LL_LLCACHENAME_H
#define LL_LLCACHENAME_H
#include <boost/bind.hpp>
#include <boost/signals2.hpp>
class LLMessageSystem;
class LLHost;
class LLUUID;
typedef boost::signals2::signal<void (const LLUUID& id,
const std::string& first_name,
const std::string& last_name,
BOOL is_group)> LLCacheNameSignal;
typedef LLCacheNameSignal::slot_type LLCacheNameCallback;
// Old callback with user data for compatability
typedef void (*old_callback_t)(const LLUUID&, const std::string&, const std::string&, BOOL, void*);
// Here's the theory:
// If you request a name that isn't in the cache, it returns "waiting"
// and requests the data. After the data arrives, you get that on
// subsequent calls.
// If the data hasn't been updated in an hour, it requests it again,
// but keeps giving you the old value until new data arrives.
// If you haven't requested the data in an hour, it releases it.
class LLCacheName
{
public:
LLCacheName(LLMessageSystem* msg);
LLCacheName(LLMessageSystem* msg, const LLHost& upstream_host);
~LLCacheName();
// registers the upstream host
// for viewers, this is the currently connected simulator
// for simulators, this is the data server
void setUpstream(const LLHost& upstream_host);
boost::signals2::connection addObserver(const LLCacheNameCallback& callback);
// janky old format. Remove after a while. Phoenix. 2008-01-30
void importFile(LLFILE* fp);
// storing cache on disk; for viewer, in name.cache
bool importFile(std::istream& istr);
void exportFile(std::ostream& ostr);
// If available, copies the first and last name into the strings provided.
// first must be at least DB_FIRST_NAME_BUF_SIZE characters.
// last must be at least DB_LAST_NAME_BUF_SIZE characters.
// If not available, copies the string "waiting".
// Returns TRUE iff available.
BOOL getName(const LLUUID& id, std::string& first, std::string& last);
BOOL getFullName(const LLUUID& id, std::string& fullname);
// Reverse lookup of UUID from name
BOOL getUUID(const std::string& first, const std::string& last, LLUUID& id);
BOOL getUUID(const std::string& fullname, LLUUID& id);
// If available, this method copies the group name into the string
// provided. The caller must allocate at least
// DB_GROUP_NAME_BUF_SIZE characters. If not available, this
// method copies the string "waiting". Returns TRUE iff available.
BOOL getGroupName(const LLUUID& id, std::string& group);
// Call the callback with the group or avatar name.
// If the data is currently available, may call the callback immediatly
// otherwise, will request the data, and will call the callback when
// available. There is no garuntee the callback will ever be called.
boost::signals2::connection get(const LLUUID& id, BOOL is_group, const LLCacheNameCallback& callback);
// LEGACY
boost::signals2::connection get(const LLUUID& id, BOOL is_group, old_callback_t callback, void* user_data);
// This method needs to be called from time to time to send out
// requests.
void processPending();
// Expire entries created more than "secs" seconds ago.
void deleteEntriesOlderThan(S32 secs);
// Debugging
void dump(); // Dumps the contents of the cache
void dumpStats(); // Dumps the sizes of the cache and associated queues.
static std::string getDefaultName();
static void LocalizeCacheName(std::string key, std::string value);
static std::map<std::string, std::string> sCacheName;
private:
class Impl;
Impl& impl;
};
extern LLCacheName* gCacheName;
#endif
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