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// // WordDBInfo.h // // NAME // inverted index usage environment. // // SYNOPSIS // // Only called thru WordContext::Initialize() // // DESCRIPTION // // The inverted indexes may be shared among processes/threads and provide the // appropriate locking to prevent mistakes. In addition the memory cache // used by <i>WordList</i> objects may be shared by processes/threads, // greatly reducing the memory needs in multi-process applications. // For more information about the shared environment, check the Berkeley // DB documentation. // // CONFIGURATION // // wordlist_env_skip {true,false} (default false) // If true no environment is created at all. This must never // be used if a <i>WordList</i> object is created. It may be // useful if only <i>WordKey</i> objects are used, for instance. // // wordlist_env_share {true,false} (default false) // If true a sharable environment is open or created if none exist. // // wordlist_env_dir <directory> (default .) // Only valid if <i>wordlist_env_share</i> set to <i>true.</i> // Specify the directory in which the sharable environment will // be created. All // inverted indexes specified with a non-absolute pathname will be // created relative to this directory. // // // END // // Part of the ht://Dig package <http://www.htdig.org/> // Copyright (c) 1999-2004 The ht://Dig Group // For copyright details, see the file COPYING in your distribution // or the GNU Library General Public License (LGPL) version 2 or later // <http://www.gnu.org/copyleft/lgpl.html> // // #ifndef _WordDBInfo_h_ #define _WordDBInfo_h_ #include "Configuration.h" struct __db_env; class WordDBInfo { public: WordDBInfo(const Configuration& config); ~WordDBInfo(); // // Unique instance handlers // static void Initialize(const Configuration& config); static WordDBInfo* Instance() { if(instance) return instance; fprintf(stderr, "WordDBInfo::Instance: no instance\n"); return 0; } // // Berkeley DB environment // struct __db_env *dbenv; // // Unique instance pointer // static WordDBInfo* instance; }; #endif