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Annotation of parser3/src/include/pa_db_connection.h, revision 1.17

1.1       parser      1: /** @file
1.9       paf         2:        Parser: sql driver connection decl.
                      3:        global sql driver connection, must be thread-safe
1.1       parser      4: 
                      5:        Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.17    ! paf         6:        Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
1.1       parser      7: 
1.17    ! paf         8:        $Id: pa_db_connection.h,v 1.16 2001/11/05 10:42:59 paf Exp $
1.1       parser      9: */
                     10: 
                     11: #ifndef PA_DB_CONNECTION_H
                     12: #define PA_DB_CONNECTION_H
                     13: 
                     14: #include "pa_config_includes.h"
                     15: #include "pa_pool.h"
1.9       paf        16: #include "pa_hash.h"
1.10      paf        17: #include "pa_db_table.h"
1.17    ! paf        18: #include "pa_value.h"
1.1       parser     19: 
                     20: // defines
                     21: 
1.2       parser     22: // forwards
                     23: 
1.9       paf        24: class DB_Table;
1.10      paf        25: class DB_Connection_ptr;
1.1       parser     26: 
1.9       paf        27: /// sql driver connection
1.1       parser     28: class DB_Connection : public Pooled {
1.15      paf        29:        friend class DB_Table;
                     30:        friend class DB_Connection_ptr;
1.1       parser     31: public:
                     32: 
1.10      paf        33:        DB_Connection(Pool& apool, const String& db_home);
                     34:        ~DB_Connection();
1.1       parser     35: 
                     36:        bool expired(time_t older_dies) {
1.10      paf        37:                return !used && time_used<older_dies;
1.1       parser     38:        }
1.17    ! paf        39:        const String& db_home() { return fdb_home; }
1.16      paf        40:        time_t get_time_used() { return time_used; }
                     41:        int get_users_count() { return used; }
1.1       parser     42: 
1.9       paf        43:        /**
1.16      paf        44:                connect to specified file_name
1.9       paf        45:        */
1.11      paf        46:        DB_Table_ptr get_table_ptr(const String& file_name, const String *source);
1.9       paf        47: 
1.10      paf        48: private: // connection usage methods
                     49: 
                     50:        void use() {
                     51:                time_used=time(0); // they started to use at this time
                     52:                used++;
                     53:        }
                     54:        void unuse() {
                     55:                used--;
                     56:        }
                     57: 
                     58: private: // connection usage data
                     59: 
                     60:        int used;
                     61: 
1.9       paf        62: private: // table cache
                     63: 
                     64:        DB_Table *get_table_from_cache(const String& file_name);
                     65:        void put_table_to_cache(const String& file_name, DB_Table& table);
                     66:        void maybe_expire_table_cache();
1.1       parser     67: private:
1.9       paf        68:        time_t prev_expiration_pass_time;
1.1       parser     69: 
1.9       paf        70: private: // for DB_Table
1.1       parser     71: 
1.9       paf        72:        /// caches table
                     73:        void close_table(const String& file_name, DB_Table& table);
1.2       parser     74: 
1.9       paf        75: private:
1.2       parser     76: 
1.9       paf        77:        time_t time_used;
1.2       parser     78: 
1.9       paf        79:        const String& fdb_home;
                     80:        DB_ENV dbenv;
                     81:        Hash table_cache;
1.2       parser     82: 
1.1       parser     83: private:
                     84: 
                     85:        void check(const char *operation, const String *source, int error);
1.17    ! paf        86: 
        !            87: public: 
        !            88: 
        !            89:        Value& get_status(Pool& pool, const String *source);
1.10      paf        90: };
                     91: 
                     92: /// Auto-object used to track DB_Connection usage
                     93: class DB_Connection_ptr {
                     94:        DB_Connection *fconnection;
                     95: public:
                     96:        DB_Connection_ptr(DB_Connection *aconnection) : fconnection(aconnection) {
                     97:                fconnection->use();
                     98:        }
                     99:        ~DB_Connection_ptr() {
                    100:                fconnection->unuse();
                    101:        }
                    102:        DB_Connection* operator->() {
                    103:                return fconnection;
                    104:        }
                    105: 
                    106:        // copying
                    107:        DB_Connection_ptr(const DB_Connection_ptr& src) : fconnection(src.fconnection) {
                    108:                fconnection->use();
                    109:        }
                    110:        DB_Connection_ptr& operator =(const DB_Connection_ptr& src) {
                    111:                // may do without this=src check
                    112:                fconnection->unuse();
                    113:                fconnection=src.fconnection;
                    114:                fconnection->use();
                    115: 
                    116:                return *this;
                    117:        }
1.1       parser    118: };
                    119: 
                    120: #endif