|
|
| version 1.25, 2001/08/23 11:57:15 | version 1.28, 2001/08/27 12:02:24 |
|---|---|
| Line 1 | Line 1 |
| /** @file | /** @file |
| 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) |
| */ | */ |
| static const char *RCSId="$Id$"; | static const char *RCSId="$Id$"; |
| #include "pa_sql_driver_manager.h" | #include "pa_sql_driver_manager.h" |
| #include "ltdl.h" | #include "ltdl.h" |
| #include "pa_sql_connection.h" | #include "pa_sql_connection.h" |
| #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_sapi.h" | #include "pa_sapi.h" |
| // globals | // globals |
| SQL_Driver_manager *SQL_driver_manager; | SQL_Driver_manager *SQL_driver_manager; |
| // consts | // consts |
| const char *LIBRARY_CREATE_FUNC_NAME="create"; | const char *LIBRARY_CREATE_FUNC_NAME="create"; |
| const int EXPIRE_UNUSED_CONNECTION_SECONDS=60; | const int EXPIRE_UNUSED_CONNECTION_SECONDS=60; |
| const int CHECK_EXPIRED_CONNECTIONS_SECONDS=60*2; | const int CHECK_EXPIRED_CONNECTIONS_SECONDS=60*2; |
| /// SQL_Driver_services Pooled implementation | /// SQL_Driver_services Pooled implementation |
| class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled { | class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled { |
| public: | public: |
| SQL_Driver_services_impl(Pool& apool, const String& aurl) : Pooled(apool), | SQL_Driver_services_impl(Pool& apool, const String& aurl) : Pooled(apool), |
| furl(aurl) { | furl(aurl) { |
| } | } |
| /// allocates some bytes on pool | /// allocates some bytes on pool |
| void *malloc(size_t size) { return Pooled::malloc(size); } | void *malloc(size_t size) { return Pooled::malloc(size); } |
| /// allocates some bytes clearing them with zeros | /// allocates some bytes clearing them with zeros |
| void *calloc(size_t size) { return Pooled::calloc(size); } | void *calloc(size_t size) { return Pooled::calloc(size); } |
| /// throw exception | /// throw exception |
| void _throw(const char *comment) { | void _throw(const char *comment) { |
| THROW(0, 0, | THROW(0, 0, |
| &furl, | &furl, |
| comment); | comment); |
| } | } |
| private: | private: |
| const String& furl; | const String& furl; |
| }; | }; |
| // SQL_Driver_manager | // SQL_Driver_manager |
| /// @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, |
| Table *protocol2driver_and_client) { | Table *protocol2driver_and_client) { |
| Pool& pool=request_url.pool(); // request pool | Pool& pool=request_url.pool(); // request pool |
| // 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, | PTHROW(0, 0, |
| &request_url, | &request_url, |
| "$SQL:drivers table must be defined"); | "$SQL:drivers table must be defined"); |
| // first trying to get cached connection | // first trying to get cached connection |
| SQL_Connection *result=get_connection_from_cache(request_url); | SQL_Connection *result=get_connection_from_cache(request_url); |
| if(result && !result->ping()) { // we have some cached connection, is it pingable? | if(result && !result->ping()) { // we have some cached connection, is it pingable? |
| result->disconnect(); // kill unpingabe=dead connection | result->disconnect(); // kill unpingabe=dead connection |
| result=0; | result=0; |
| } | } |
| char *request_url_cstr; | char *request_url_cstr; |
| if(result) | if(result) |
| request_url_cstr=0; // calm, compiler | request_url_cstr=0; // calm, compiler |
| 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, | PTHROW(0, 0, |
| &request_url, | &request_url, |
| "no protocol specified"); // NOTE: not THROW, but PTHROW | "no protocol specified"); // NOTE: not THROW, but PTHROW |
| // make global_url C-string on global pool | // make global_url C-string on global pool |
| request_url_cstr=request_url.cstr(String::UL_AS_IS); | request_url_cstr=request_url.cstr(String::UL_AS_IS); |
| char *global_url_cstr=(char *)malloc(strlen(request_url_cstr)+1); | char *global_url_cstr=(char *)malloc(strlen(request_url_cstr)+1); |
| strcpy(global_url_cstr, request_url_cstr); | strcpy(global_url_cstr, request_url_cstr); |
| // make global_url string on global pool | // make global_url string on global pool |
| String& global_url=*new(this->pool()) String(this->pool(), global_url_cstr); | String& global_url=*new(this->pool()) String(this->pool(), global_url_cstr); |
| char *request_protocol_cstr=lsplit(&request_url_cstr, ':'); | char *request_protocol_cstr=lsplit(&request_url_cstr, ':'); |
| // skip "//" after ':' | // skip "//" after ':' |
| while(*request_url_cstr=='/') | while(*request_url_cstr=='/') |
| request_url_cstr++; | request_url_cstr++; |
| // make global_protocol C-string on global pool | // make global_protocol C-string on global pool |
| char *global_protocol_cstr=(char *)malloc(strlen(request_protocol_cstr)+1); | char *global_protocol_cstr=(char *)malloc(strlen(request_protocol_cstr)+1); |
| strcpy(global_protocol_cstr, request_protocol_cstr); | strcpy(global_protocol_cstr, request_protocol_cstr); |
| // make global_protocol string on global pool | // make global_protocol string on global pool |
| String& global_protocol=*new(this->pool()) String(this->pool(), | String& global_protocol=*new(this->pool()) String(this->pool(), |
| global_protocol_cstr); | global_protocol_cstr); |
| SQL_Driver *driver; | SQL_Driver *driver; |
| const String *dlopen_file_spec=0; | const String *dlopen_file_spec=0; |
| // first trying to get cached driver | // first trying to get cached driver |
| if(!(driver=get_driver_from_cache(global_protocol))) { | if(!(driver=get_driver_from_cache(global_protocol))) { |
| // no cached | // no cached |
| 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, | PTHROW(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, | PTHROW(0, 0, |
| &request_url, | &request_url, |
| "undefined protocol '%s'", | "undefined protocol '%s'", |
| request_protocol_cstr); | request_protocol_cstr); |
| const char *filename=library->cstr(String::UL_FILE_NAME); | if(lt_dlinit()) |
| lt_dlhandle handle=lt_dlopen(filename); | PTHROW(0, 0, |
| if (!handle) | library, |
| PTHROW(0, 0, | "prepare to dynamic loading failed, %s", lt_dlerror()); |
| library, | |
| "can not open the module, %s", lt_dlerror()); | const char *filename=library->cstr(String::UL_FILE_NAME); |
| lt_dlhandle handle=lt_dlopen(filename); | |
| SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, | if (!handle) |
| LIBRARY_CREATE_FUNC_NAME); | PTHROW(0, 0, |
| if(!create) | library, |
| PTHROW(0, 0, | "can not open the module, %s", lt_dlerror()); |
| library, | |
| "function '%s' was not found", LIBRARY_CREATE_FUNC_NAME); | SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, |
| LIBRARY_CREATE_FUNC_NAME); | |
| // create library-driver! | if(!create) |
| driver=(*create)(); | PTHROW(0, 0, |
| library, | |
| // validate driver api version | "function '%s' was not found", LIBRARY_CREATE_FUNC_NAME); |
| int driver_api_version=driver->api_version(); | |
| if(driver_api_version!=SQL_DRIVER_API_VERSION) | // create library-driver! |
| PTHROW(0, 0, | driver=(*create)(); |
| library, | |
| "driver implements API version 0x%04X not equal to 0x%04X", | // validate driver api version |
| driver_api_version, SQL_DRIVER_API_VERSION); | int driver_api_version=driver->api_version(); |
| if(driver_api_version!=SQL_DRIVER_API_VERSION) | |
| // initialise by connecting to sql client dynamic link library | PTHROW(0, 0, |
| bool specified_dlopen_file_spec=dlopen_file_spec && dlopen_file_spec->size(); | library, |
| const char *dlopen_file_spec_cstr= | "driver implements API version 0x%04X not equal to 0x%04X", |
| specified_dlopen_file_spec? | driver_api_version, SQL_DRIVER_API_VERSION); |
| dlopen_file_spec->cstr(String::UL_FILE_NAME):0; | |
| if(const char *error=driver->initialize( | // initialise by connecting to sql client dynamic link library |
| dlopen_file_spec_cstr)) | bool specified_dlopen_file_spec=dlopen_file_spec && dlopen_file_spec->size(); |
| PTHROW(0, 0, | const char *dlopen_file_spec_cstr= |
| library, | specified_dlopen_file_spec? |
| "driver failed to initialize client library '%s', %s", | dlopen_file_spec->cstr(String::UL_FILE_NAME):0; |
| specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed", | if(const char *error=driver->initialize( |
| error); | dlopen_file_spec_cstr)) |
| PTHROW(0, 0, | |
| // cache it | library, |
| put_driver_to_cache(global_protocol, *driver); | "driver failed to initialize client library '%s', %s", |
| } | specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed", |
| error); | |
| // allocate in global pool | |
| // associate with services[request] | // cache it |
| // NOTE: never freed up! | put_driver_to_cache(global_protocol, *driver); |
| result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver); | } |
| } | |
| // allocate in global pool | |
| // associate with services[request] (deassociates at close) | // associate with services[request] |
| result->set_services(new(pool) SQL_Driver_services_impl(pool, request_url)); | // NOTE: never freed up! |
| // if not connected yet, do that now, when result has services | result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver); |
| if(!result->connected()) | } |
| result->connect(request_url_cstr); | |
| // return it | // associate with services[request] (deassociates at close) |
| return *result; | result->set_services(new(pool) SQL_Driver_services_impl(pool, request_url)); |
| } | // if not connected yet, do that now, when result has services |
| if(!result->connected()) | |
| void SQL_Driver_manager::close_connection(const String& url, | result->connect(request_url_cstr); |
| SQL_Connection& connection) { | // return it |
| // deassociate from services[request] | return *result; |
| connection.set_services(0); | } |
| put_connection_to_cache(url, connection); | |
| } | void SQL_Driver_manager::close_connection(const String& url, |
| SQL_Connection& connection) { | |
| // deassociate from services[request] | |
| // driver cache | connection.set_services(0); |
| put_connection_to_cache(url, connection); | |
| SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) { | } |
| SYNCHRONIZED; | |
| return static_cast<SQL_Driver *>(driver_cache.get(protocol)); | // driver cache |
| } | |
| SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) { | |
| void SQL_Driver_manager::put_driver_to_cache(const String& protocol, | SYNCHRONIZED; |
| SQL_Driver& driver) { | |
| SYNCHRONIZED; | return static_cast<SQL_Driver *>(driver_cache.get(protocol)); |
| } | |
| driver_cache.put(protocol, &driver); | |
| } | void SQL_Driver_manager::put_driver_to_cache(const String& protocol, |
| SQL_Driver& driver) { | |
| // connection cache | SYNCHRONIZED; |
| /// @todo get rid of memory spending Stack [zeros deep inside got accumulated] | |
| SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) { | driver_cache.put(protocol, &driver); |
| SYNCHRONIZED; | } |
| maybe_expire_connection_cache(); | // connection cache |
| /// @todo get rid of memory spending Stack [zeros deep inside got accumulated] | |
| if(Stack *connections=static_cast<Stack *>(connection_cache.get(url))) | SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) { |
| while(connections->top_index()>=0) { // there are cached connections to that 'url' | SYNCHRONIZED; |
| SQL_Connection *result=static_cast<SQL_Connection *>(connections->pop()); | |
| if(result->connected()) // not expired? | maybe_expire_connection_cache(); |
| return result; | |
| } | if(Stack *connections=static_cast<Stack *>(connection_cache.get(url))) |
| while(connections->top_index()>=0) { // there are cached connections to that 'url' | |
| return 0; | SQL_Connection *result=static_cast<SQL_Connection *>(connections->pop()); |
| } | if(result->connected()) // not expired? |
| return result; | |
| void SQL_Driver_manager::put_connection_to_cache(const String& url, | } |
| SQL_Connection& connection) { | |
| SYNCHRONIZED; | return 0; |
| } | |
| Stack *connections=static_cast<Stack *>(connection_cache.get(url)); | |
| if(!connections) { // there are no cached connections to that 'url' yet? | void SQL_Driver_manager::put_connection_to_cache(const String& url, |
| connections=NEW Stack(pool()); // NOTE: never freed up! | SQL_Connection& connection) { |
| connection_cache.put(url, connections); | SYNCHRONIZED; |
| } | |
| connections->push(&connection); | Stack *connections=static_cast<Stack *>(connection_cache.get(url)); |
| } | if(!connections) { // there are no cached connections to that 'url' yet? |
| connections=NEW Stack(pool()); // NOTE: never freed up! | |
| static void expire_connection(Array::Item *value, void *info) { | connection_cache.put(url, connections); |
| SQL_Connection& connection=*static_cast<SQL_Connection *>(value); | } |
| time_t older_dies=reinterpret_cast<time_t>(info); | connections->push(&connection); |
| } | |
| if(connection.expired(older_dies)) | |
| connection.disconnect(); | static void expire_connection(Array::Item *value, void *info) { |
| } | SQL_Connection& connection=*static_cast<SQL_Connection *>(value); |
| static void expire_connections(const Hash::Key& key, Hash::Val *value, void *info) { | time_t older_dies=reinterpret_cast<time_t>(info); |
| Stack& stack=*static_cast<Stack *>(value); | |
| for(int i=0; i<=stack.top_index(); i++) | if(connection.connected() && connection.expired(older_dies)) |
| expire_connection(stack.get(i), info); | connection.disconnect(); |
| } | } |
| void SQL_Driver_manager::maybe_expire_connection_cache() { | static void expire_connections(const Hash::Key& key, Hash::Val *value, void *info) { |
| time_t now=time(0); | Stack& stack=*static_cast<Stack *>(value); |
| for(int i=0; i<=stack.top_index(); i++) | |
| if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) { | expire_connection(stack.get(i), info); |
| connection_cache.for_each(expire_connections, | } |
| reinterpret_cast<void *>(now-EXPIRE_UNUSED_CONNECTION_SECONDS)); | void SQL_Driver_manager::maybe_expire_connection_cache() { |
| time_t now=time(0); | |
| prev_expiration_pass_time=now; | |
| } | if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) { |
| } | connection_cache.for_each(expire_connections, |
| reinterpret_cast<void *>(now-EXPIRE_UNUSED_CONNECTION_SECONDS)); | |
| prev_expiration_pass_time=now; | |
| } | |
| } |