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/**
* @file llcachename.h
* @brief A cache of names from UUIDs.
*
* Copyright (c) 2002-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#ifndef LL_LLCACHENAME_H
#define LL_LLCACHENAME_H
// Forward declarations
#include <stdio.h>
class LLMessageSystem;
class LLHost;
class LLUUID;
// agent_id/group_id, first_name, last_name, is_group, user_data
typedef void (*LLCacheNameCallback)(const LLUUID&, const char*, const char*, 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);
void addObserver(LLCacheNameCallback callback);
void removeObserver(LLCacheNameCallback callback);
void cancelCallback(const LLUUID& id, LLCacheNameCallback callback, void* user_data = NULL);
// storing cache on disk; for viewer, in name.cache
void importFile(FILE* fp);
void exportFile(FILE* fp);
// 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, char* first, char* last);
// 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, char* 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.
void get(const LLUUID& id, BOOL is_group, LLCacheNameCallback callback, void* user_data = NULL);
// LEGACY
void getName(const LLUUID& id, LLCacheNameCallback callback, void* user_data = NULL)
{ get(id, FALSE, callback, 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 LLString getDefaultName();
private:
class Impl;
Impl& impl;
};
extern LLCacheName* gCacheName;
#endif
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