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| version 1.36, 2001/09/18 16:05:42 | version 1.43, 2001/10/29 08:05:37 |
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| Line 2 | Line 2 |
| Parser: sql driver manager implementation. | Parser: sql driver manager implementation. |
| Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) | Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) |
| Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf) | Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf) |
| $Id$ | |
| */ | */ |
| static const char *RCSId="$Id$"; | |
| #include "pa_sql_driver_manager.h" | #include "pa_sql_driver_manager.h" |
| #include "ltdl.h" | #include "ltdl.h" |
| Line 13 static const char *RCSId="$Id$"; | Line 13 static const char *RCSId="$Id$"; |
| #include "pa_exception.h" | #include "pa_exception.h" |
| #include "pa_common.h" | #include "pa_common.h" |
| #include "pa_threads.h" | #include "pa_threads.h" |
| #include "pa_stack.h" | |
| // globals | // globals |
| Line 31 public: | Line 32 public: |
| furl(aurl) { | furl(aurl) { |
| } | } |
| /// allocates some bytes on pool | virtual void *malloc(size_t size) { return Pooled::malloc(size); } |
| void *malloc(size_t size) { return Pooled::malloc(size); } | virtual void *calloc(size_t size) { return Pooled::calloc(size); } |
| /// allocates some bytes clearing them with zeros | |
| void *calloc(size_t size) { return Pooled::calloc(size); } | /** |
| /// throw exception | the idea is to #1 jump to C++ some function to main body, where |
| void _throw(const char *comment) { | every function stack frame has exception unwind information |
| THROW(0, 0, | and from there... #2 propagate_exception() |
| */ | |
| virtual void _throw(const char *comment) { | |
| e=Exception(0, 0, | |
| &furl, | &furl, |
| comment); | comment); |
| longjmp(mark, 1); | |
| } | |
| virtual void propagate_exception() { | |
| throw e; | |
| } | } |
| private: | private: |
| const String& furl; | const String& furl; |
| Exception e; | |
| }; | }; |
| // helpers | |
| static void expire_connection(Array::Item *value, void *info) { | |
| SQL_Connection& connection=*static_cast<SQL_Connection *>(value); | |
| time_t older_dies=reinterpret_cast<time_t>(info); | |
| if(connection.connected() && connection.expired(older_dies)) | |
| connection.disconnect(); | |
| } | |
| static void expire_connections(const Hash::Key& key, Hash::Val *value, void *info) { | |
| Stack& stack=*static_cast<Stack *>(value); | |
| for(int i=0; i<=stack.top_index(); i++) | |
| expire_connection(stack.get(i), info); | |
| } | |
| // SQL_Driver_manager | // SQL_Driver_manager |
| SQL_Driver_manager::SQL_Driver_manager(Pool& pool) : Pooled(pool), | |
| driver_cache(pool), | |
| connection_cache(pool), | |
| prev_expiration_pass_time(0) { | |
| } | |
| SQL_Driver_manager::~SQL_Driver_manager() { | |
| connection_cache.for_each(expire_connections, | |
| reinterpret_cast<void *>((time_t)0/*=in past=expire all*/)); | |
| } | |
| /// @param request_url protocol://[driver-dependent] | /// @param request_url protocol://[driver-dependent] |
| SQL_Connection& SQL_Driver_manager::get_connection(const String& request_url, | SQL_Connection& SQL_Driver_manager::get_connection(const String& request_url, |
| const String& request_origin, | const String& request_origin, |
| Line 56 SQL_Connection& SQL_Driver_manager::get_ | Line 93 SQL_Connection& SQL_Driver_manager::get_ |
| // we have table for locating protocol's library | // we have table for locating protocol's library |
| if(!protocol2driver_and_client) | if(!protocol2driver_and_client) |
| PTHROW(0, 0, | throw Exception(0, 0, |
| &request_url, | &request_url, |
| "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined"); | "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined"); |
| Line 73 SQL_Connection& SQL_Driver_manager::get_ | Line 110 SQL_Connection& SQL_Driver_manager::get_ |
| else { // no cached connection or it were unpingabe: connect/reconnect | else { // no cached connection or it were unpingabe: connect/reconnect |
| int pos=request_url.pos("://", 3); | int pos=request_url.pos("://", 3); |
| if(pos<0) | if(pos<0) |
| PTHROW(0, 0, | throw Exception(0, 0, |
| request_url.size()?&request_url:&request_origin, | request_url.size()?&request_url:&request_origin, |
| "connection string must start with protocol://"); // NOTE: not THROW, but PTHROW | "connection string must start with protocol://"); // NOTE: not THROW, but PTHROW |
| Line 103 SQL_Connection& SQL_Driver_manager::get_ | Line 140 SQL_Connection& SQL_Driver_manager::get_ |
| const String *library=0; | const String *library=0; |
| if(protocol2driver_and_client->locate(0, global_protocol)) { | if(protocol2driver_and_client->locate(0, global_protocol)) { |
| if(!(library=protocol2driver_and_client->item(1)) || library->size()==0) | if(!(library=protocol2driver_and_client->item(1)) || library->size()==0) |
| PTHROW(0, 0, | throw Exception(0, 0, |
| protocol2driver_and_client->origin_string(), | protocol2driver_and_client->origin_string(), |
| "driver library column for protocol '%s' is empty", | "driver library column for protocol '%s' is empty", |
| request_protocol_cstr); | request_protocol_cstr); |
| dlopen_file_spec=protocol2driver_and_client->item(2); | dlopen_file_spec=protocol2driver_and_client->item(2); |
| } else | } else |
| PTHROW(0, 0, | throw Exception(0, 0, |
| &request_url, | &request_url, |
| "undefined protocol '%s'", | "undefined protocol '%s'", |
| request_protocol_cstr); | request_protocol_cstr); |
| if(lt_dlinit()) | if(lt_dlinit()) |
| PTHROW(0, 0, | throw Exception(0, 0, |
| library, | library, |
| "prepare to dynamic loading failed, %s", lt_dlerror()); | "prepare to dynamic loading failed, %s", lt_dlerror()); |
| const char *filename=library->cstr(String::UL_FILE_SPEC); | const char *filename=library->cstr(String::UL_FILE_SPEC); |
| lt_dlhandle handle=lt_dlopen(filename); | lt_dlhandle handle=lt_dlopen(filename); |
| if (!handle) | if (!handle) |
| PTHROW(0, 0, | throw Exception(0, 0, |
| library, | library, |
| "can not open the module, %s", lt_dlerror()); | "can not open the module, %s", lt_dlerror()); |
| SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, | SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, |
| SQL_DRIVER_CREATE_NAME); | SQL_DRIVER_CREATE_NAME); |
| if(!create) | if(!create) |
| PTHROW(0, 0, | throw Exception(0, 0, |
| library, | library, |
| "function '"SQL_DRIVER_CREATE_NAME"' was not found"); | "function '"SQL_DRIVER_CREATE_NAME"' was not found"); |
| Line 139 SQL_Connection& SQL_Driver_manager::get_ | Line 176 SQL_Connection& SQL_Driver_manager::get_ |
| // validate driver api version | // validate driver api version |
| int driver_api_version=driver->api_version(); | int driver_api_version=driver->api_version(); |
| if(driver_api_version!=SQL_DRIVER_API_VERSION) | if(driver_api_version!=SQL_DRIVER_API_VERSION) |
| PTHROW(0, 0, | throw Exception(0, 0, |
| library, | library, |
| "driver implements API version 0x%04X not equal to 0x%04X", | "driver implements API version 0x%04X not equal to 0x%04X", |
| driver_api_version, SQL_DRIVER_API_VERSION); | driver_api_version, SQL_DRIVER_API_VERSION); |
| Line 151 SQL_Connection& SQL_Driver_manager::get_ | Line 188 SQL_Connection& SQL_Driver_manager::get_ |
| dlopen_file_spec->cstr(String::UL_FILE_SPEC):0; | dlopen_file_spec->cstr(String::UL_FILE_SPEC):0; |
| if(const char *error=driver->initialize( | if(const char *error=driver->initialize( |
| dlopen_file_spec_cstr)) | dlopen_file_spec_cstr)) |
| PTHROW(0, 0, | throw Exception(0, 0, |
| library, | library, |
| "driver failed to initialize client library '%s', %s", | "driver failed to initialize client library '%s', %s", |
| specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed", | specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed", |
| Line 228 void SQL_Driver_manager::put_connection_ | Line 265 void SQL_Driver_manager::put_connection_ |
| connections->push(&connection); | connections->push(&connection); |
| } | } |
| static void expire_connection(Array::Item *value, void *info) { | |
| SQL_Connection& connection=*static_cast<SQL_Connection *>(value); | |
| time_t older_dies=reinterpret_cast<time_t>(info); | |
| if(connection.connected() && connection.expired(older_dies)) | |
| connection.disconnect(); | |
| } | |
| static void expire_connections(const Hash::Key& key, Hash::Val *value, void *info) { | |
| Stack& stack=*static_cast<Stack *>(value); | |
| for(int i=0; i<=stack.top_index(); i++) | |
| expire_connection(stack.get(i), info); | |
| } | |
| void SQL_Driver_manager::maybe_expire_connection_cache() { | void SQL_Driver_manager::maybe_expire_connection_cache() { |
| time_t now=time(0); | time_t now=time(0); |