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Annotation of parser3/src/include/pa_sql_driver_manager.h, revision 1.9

1.1       paf         1: /** @file
1.2       paf         2:        Parser: sql driver manager decl.
1.1       paf         3: 
                      4:        Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
                      5: 
                      6:        Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
                      7: 
1.9     ! parser      8:        $Id: pa_sql_driver_manager.h,v 1.8 2001/09/05 09:02:52 parser Exp $
1.1       paf         9: 
                     10: 
                     11:        global sql driver manager, must be thread-safe
                     12: */
                     13: 
                     14: #ifndef PA_SQL_DRIVER_MANAGER_H
                     15: #define PA_SQL_DRIVER_MANAGER_H
                     16: 
1.4       parser     17: #include "pa_config_includes.h"
1.1       paf        18: #include "pa_pool.h"
                     19: #include "pa_sql_driver.h"
                     20: #include "pa_hash.h"
                     21: #include "pa_stack.h"
                     22: #include "pa_table.h"
                     23: #include "pa_string.h"
1.8       parser     24: 
                     25: 
                     26: // defines
                     27: 
                     28: #define MAIN_SQL_NAME "SQL"
                     29: #define MAIN_SQL_DRIVERS_NAME "drivers"
                     30: 
                     31: // forwards
1.1       paf        32: 
                     33: class SQL_Connection;
                     34: 
1.9     ! parser     35: /**    sql driver manager
        !            36:                maintains 
        !            37:                - driver cache  which never expires
        !            38:                - connection cache  unused connections got expired
        !            39: */
1.1       paf        40: class SQL_Driver_manager : public Pooled {
                     41:        friend SQL_Connection;
                     42: public:
                     43: 
                     44:        SQL_Driver_manager(Pool& pool) : Pooled(pool),
                     45:                driver_cache(pool),
1.7       parser     46:                connection_cache(pool),
                     47:                prev_expiration_pass_time(0) {
1.1       paf        48:        }
                     49: 
                     50:        /** 
                     51:                connect to specified url, 
                     52:                using driver dynamic library found in table, if not loaded yet
                     53:                checks driver version
                     54:        */
1.3       paf        55:        SQL_Connection& get_connection(const String& url, Table *protocol2driver_and_client);
1.1       paf        56: 
                     57: private: // driver cache
                     58: 
                     59:        SQL_Driver *get_driver_from_cache(const String& protocol);
                     60:        void put_driver_to_cache(const String& protocol, SQL_Driver& driver);
                     61: 
                     62: private: // connection cache
                     63: 
                     64:        SQL_Connection *get_connection_from_cache(const String& url);
                     65:        void put_connection_to_cache(const String& url, SQL_Connection& connection);
1.7       parser     66:        void maybe_expire_connection_cache();
                     67: private:
                     68:        time_t prev_expiration_pass_time;
1.1       paf        69: 
                     70: private: // for SQL_Connection
                     71: 
                     72:        /// caches connection
1.6       parser     73:        void close_connection(const String& url, SQL_Connection& connection);
1.1       paf        74: 
                     75: private:
                     76: 
                     77:        Hash driver_cache;
                     78:        Hash connection_cache;
                     79: };
                     80: 
                     81: /// global
                     82: extern SQL_Driver_manager *SQL_driver_manager;
                     83: 
                     84: #endif