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Annotation of parser3/src/include/pa_db_manager.h, revision 1.1

1.1     ! parser      1: /** @file
        !             2:        Parser: sql driver manager decl.
        !             3:        global sql driver manager, must be thread-safe
        !             4: 
        !             5:        Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
        !             6:        Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
        !             7: 
        !             8:        $Id: pa_DB_driver_manager.h,v 1.12 2001/09/26 10:32:25 parser Exp $
        !             9: */
        !            10: 
        !            11: #ifndef PA_DB_DRIVER_MANAGER_H
        !            12: #define PA_DB_DRIVER_MANAGER_H
        !            13: 
        !            14: #include "pa_config_includes.h"
        !            15: #include "pa_pool.h"
        !            16: #include "pa_hash.h"
        !            17: 
        !            18: #ifdef HAVE_DB_H
        !            19: #      include <db.h>
        !            20: #endif
        !            21: 
        !            22: // defines
        !            23: 
        !            24: // forwards
        !            25: 
        !            26: class DB_Connection;
        !            27: 
        !            28: /// sql driver manager
        !            29: class DB_Manager : public Pooled {
        !            30:        friend DB_Connection;
        !            31: public:
        !            32: 
        !            33:        DB_Manager(Pool& pool);
        !            34:        ~DB_Manager();
        !            35: 
        !            36:        /** 
        !            37:                connect to specified file_spec, 
        !            38:                using driver dynamic library found in table, if not loaded yet
        !            39:                checks driver version
        !            40:        */
        !            41:        DB_Connection& get_connection(const String& file_spec, const String& request_origin);
        !            42: 
        !            43: private: // connection cache
        !            44: 
        !            45:        DB_Connection *get_connection_from_cache(const String& file_spec);
        !            46:        void put_connection_to_cache(const String& file_spec, DB_Connection& connection);
        !            47:        void maybe_expire_connection_cache();
        !            48: private:
        !            49:        time_t prev_expiration_pass_time;
        !            50: 
        !            51: private: // for DB_Connection
        !            52: 
        !            53:        /// caches connection
        !            54:        void close_connection(const String& file_spec, DB_Connection& connection);
        !            55: 
        !            56: private:
        !            57: 
        !            58:        Hash connection_cache;
        !            59:        DB_ENV dbenv;
        !            60: 
        !            61: private:
        !            62: 
        !            63:        void check(const char *operation, int error);
        !            64: };
        !            65: 
        !            66: /// global
        !            67: extern DB_Manager *DB_manager;
        !            68: 
        !            69: #endif