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| version 1.5, 2001/04/05 11:50:09 | version 1.36, 2001/09/18 16:05:42 |
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| Line 4 | Line 4 |
| 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_config_includes.h" | |
| #include "ltdl.h" | |
| #include "pa_sql_driver_manager.h" | #include "pa_sql_driver_manager.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" | |
| // globals | // globals |
| Line 21 SQL_Driver_manager *SQL_driver_manager; | Line 20 SQL_Driver_manager *SQL_driver_manager; |
| // consts | // consts |
| const int MAX_PROTOCOL=20; | const int EXPIRE_UNUSED_CONNECTION_SECONDS=60; |
| const char *LIBRARY_CREATE_FUNC_NAME="create"; | const int CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2; |
| /// Services_for_SQL_driver implementation | /// SQL_Driver_services Pooled implementation |
| class Services_for_SQL_driver_impl : public Services_for_SQL_driver, public Pooled { | class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled { |
| public: | public: |
| Services_for_SQL_driver_impl(Pool& apool, const String& aurl) : Pooled(apool), | SQL_Driver_services_impl(Pool& apool, const String& aurl) : Pooled(apool), |
| furl(aurl) { | furl(aurl) { |
| } | } |
| Line 49 private: | Line 48 private: |
| // SQL_Driver_manager | // SQL_Driver_manager |
| // url: | /// @param request_url protocol://[driver-dependent] |
| // protocol://user:pass@host:port/database | SQL_Connection& SQL_Driver_manager::get_connection(const String& request_url, |
| // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this is driver-dependent | const String& request_origin, |
| SQL_Connection& SQL_Driver_manager::get_connection(const String& url, | Table *protocol2driver_and_client) { |
| Table *protocol2library) { | Pool& pool=request_origin.pool(); // request pool |
| SYNCHRONIZED(true); | |
| Pool& pool=url.pool(); // request pool | |
| // we have table for locating protocol's library | // we have table for locating protocol's library |
| if(!protocol2library) | if(!protocol2driver_and_client) |
| PTHROW(0, 0, | PTHROW(0, 0, |
| &url, | &request_url, |
| "SQL:drivers table must be defined"); | "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined"); |
| // first trying to get cached connection | // first trying to get cached connection |
| if(SQL_Connection *result=get_connection_from_cache(url)) | SQL_Connection *result=get_connection_from_cache(request_url); |
| if(result->ping()) | if(result && !result->ping()) { // we have some cached connection, is it pingable? |
| return *result; | result->disconnect(); // kill unpingabe=dead connection |
| else | result=0; |
| result->disconnect(); // kill unpingabe=dead connection | } |
| // no cached connection | |
| int pos=url.pos("://", 3); | |
| if(pos<0) | |
| PTHROW(0, 0, | |
| &url, | |
| "no protocol specified"); // NOTE: not THROW, but PTHROW | |
| // make url string on global pool | |
| char *url_cstr=(char *)malloc(MAX_STRING); | |
| strncpy(url_cstr, url.cstr(String::UL_AS_IS), MAX_STRING); | |
| char *protocol_cstr=lsplit(&url_cstr, ':'); | |
| String& protocol=*new(this->pool()) String(this->pool(), protocol_cstr); | |
| // skip // after : | char *request_url_cstr; |
| while(*url_cstr=='/') | if(result) |
| url_cstr++; | request_url_cstr=0; // calm, compiler |
| else { // no cached connection or it were unpingabe: connect/reconnect | |
| SQL_Driver *driver; | int pos=request_url.pos("://", 3); |
| // first trying to get cached driver | if(pos<0) |
| if(!(driver=get_driver_from_cache(protocol))) { | |
| // no cached | |
| const String *library=0; | |
| if(protocol2library->locate(0, protocol)) { | |
| if(!(library=protocol2library->item(1)) || library->size()==0) | |
| PTHROW(0, 0, | |
| protocol2library->origin_string(), | |
| "library column for protocol '%s' is empty", protocol_cstr); | |
| } else | |
| PTHROW(0, 0, | PTHROW(0, 0, |
| &url, | request_url.size()?&request_url:&request_origin, |
| "undefined protocol '%s'", protocol_cstr); | "connection string must start with protocol://"); // NOTE: not THROW, but PTHROW |
| const char *filename=library->cstr(String::UL_FILE_NAME); | // make global_url C-string on global pool |
| lt_dlhandle handle=lt_dlopen(filename); | request_url_cstr=request_url.cstr(String::UL_AS_IS); |
| if (!handle) | char *global_url_cstr=(char *)malloc(strlen(request_url_cstr)+1); |
| PTHROW(0, 0, | strcpy(global_url_cstr, request_url_cstr); |
| library, | // make global_url string on global pool |
| "can not open the module, %s", lt_dlerror()); | String& global_url=*new(this->pool()) String(this->pool(), global_url_cstr); |
| char *request_protocol_cstr=lsplit(&request_url_cstr, ':'); | |
| // skip "//" after ':' | |
| while(*request_url_cstr=='/') | |
| request_url_cstr++; | |
| // make global_protocol C-string on global pool | |
| char *global_protocol_cstr=(char *)malloc(strlen(request_protocol_cstr)+1); | |
| strcpy(global_protocol_cstr, request_protocol_cstr); | |
| // make global_protocol string on global pool | |
| String& global_protocol=*new(this->pool()) String(this->pool(), | |
| global_protocol_cstr); | |
| SQL_Driver *driver; | |
| const String *dlopen_file_spec=0; | |
| // first trying to get cached driver | |
| if(!(driver=get_driver_from_cache(global_protocol))) { | |
| // no cached | |
| const String *library=0; | |
| if(protocol2driver_and_client->locate(0, global_protocol)) { | |
| if(!(library=protocol2driver_and_client->item(1)) || library->size()==0) | |
| PTHROW(0, 0, | |
| protocol2driver_and_client->origin_string(), | |
| "driver library column for protocol '%s' is empty", | |
| request_protocol_cstr); | |
| dlopen_file_spec=protocol2driver_and_client->item(2); | |
| } else | |
| PTHROW(0, 0, | |
| &request_url, | |
| "undefined protocol '%s'", | |
| request_protocol_cstr); | |
| SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, | if(lt_dlinit()) |
| LIBRARY_CREATE_FUNC_NAME); | PTHROW(0, 0, |
| if(!create) | library, |
| PTHROW(0, 0, | "prepare to dynamic loading failed, %s", lt_dlerror()); |
| library, | |
| "function '%s' was not found", LIBRARY_CREATE_FUNC_NAME); | |
| // create library-driver! | const char *filename=library->cstr(String::UL_FILE_SPEC); |
| driver=(*create)(); | lt_dlhandle handle=lt_dlopen(filename); |
| if (!handle) | |
| PTHROW(0, 0, | |
| library, | |
| "can not open the module, %s", lt_dlerror()); | |
| // validate driver api version | SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, |
| int driver_api_version=driver->api_version(); | SQL_DRIVER_CREATE_NAME); |
| if(driver_api_version<SQL_DRIVER_API_VERSION) | if(!create) |
| PTHROW(0, 0, | PTHROW(0, 0, |
| library, | library, |
| "driver API version is 0x%04X while current minimum is 0x%04X", | "function '"SQL_DRIVER_CREATE_NAME"' was not found"); |
| driver_api_version, SQL_DRIVER_API_VERSION); | |
| // cache it | // create library-driver! |
| put_driver_to_cache(protocol, *driver); | driver=(*create)(); |
| } | |
| // validate driver api version | |
| // services associated with request | int driver_api_version=driver->api_version(); |
| Services_for_SQL_driver_impl& services= | if(driver_api_version!=SQL_DRIVER_API_VERSION) |
| *new(pool) Services_for_SQL_driver_impl(pool, url); | PTHROW(0, 0, |
| library, | |
| // allocate in global pool | "driver implements API version 0x%04X not equal to 0x%04X", |
| // associate with services[request], deassociates at close | driver_api_version, SQL_DRIVER_API_VERSION); |
| SQL_Connection& result= | |
| *new(this->pool()) SQL_Connection(this->pool(), url, *driver, services, url_cstr); | // initialise by connecting to sql client dynamic link library |
| bool specified_dlopen_file_spec=dlopen_file_spec && dlopen_file_spec->size(); | |
| const char *dlopen_file_spec_cstr= | |
| specified_dlopen_file_spec? | |
| dlopen_file_spec->cstr(String::UL_FILE_SPEC):0; | |
| if(const char *error=driver->initialize( | |
| dlopen_file_spec_cstr)) | |
| PTHROW(0, 0, | |
| library, | |
| "driver failed to initialize client library '%s', %s", | |
| specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed", | |
| error); | |
| // cache it | |
| put_driver_to_cache(global_protocol, *driver); | |
| } | |
| return result; | // allocate in global pool |
| // associate with services[request] | |
| // NOTE: never freed up! | |
| result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver); | |
| } | |
| // associate with services[request] (deassociates at close) | |
| 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()) | |
| result->connect(request_url_cstr); | |
| // return it | |
| return *result; | |
| } | } |
| void SQL_Driver_manager::close_connection(const String& url, | void SQL_Driver_manager::close_connection(const String& url, |
| SQL_Connection& connection) { | SQL_Connection& connection) { |
| SYNCHRONIZED(true); | // deassociate from services[request] |
| connection.set_services(0); | |
| put_connection_to_cache(url, connection); | put_connection_to_cache(url, connection); |
| } | } |
| Line 156 void SQL_Driver_manager::close_connectio | Line 187 void SQL_Driver_manager::close_connectio |
| // driver cache | // driver cache |
| SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) { | SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) { |
| if(SQL_Driver *result=static_cast<SQL_Driver *>(driver_cache.get(protocol))) | SYNCHRONIZED; |
| return result; | |
| return 0; | return static_cast<SQL_Driver *>(driver_cache.get(protocol)); |
| } | } |
| void SQL_Driver_manager::put_driver_to_cache(const String& protocol, | void SQL_Driver_manager::put_driver_to_cache(const String& protocol, |
| SQL_Driver& driver) { | SQL_Driver& driver) { |
| SYNCHRONIZED; | |
| driver_cache.put(protocol, &driver); | driver_cache.put(protocol, &driver); |
| } | } |
| // connection cache | // connection cache |
| /// @todo get rid of memory spending Stack [zeros deep inside got accumulated] | |
| SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) { | SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) { |
| SYNCHRONIZED; | |
| maybe_expire_connection_cache(); | |
| if(Stack *connections=static_cast<Stack *>(connection_cache.get(url))) | if(Stack *connections=static_cast<Stack *>(connection_cache.get(url))) |
| if(connections->size()) // there are cached connections to that 'url' | while(connections->top_index()>=0) { // there are cached connections to that 'url' |
| return static_cast<SQL_Connection *>(connections->pop()); | SQL_Connection *result=static_cast<SQL_Connection *>(connections->pop()); |
| if(result->connected()) // not expired? | |
| return result; | |
| } | |
| return 0; | return 0; |
| } | } |
| /// @todo cache expiration[use SQL_Driver::disconnect], pinging. | |
| void SQL_Driver_manager::put_connection_to_cache(const String& url, | void SQL_Driver_manager::put_connection_to_cache(const String& url, |
| SQL_Connection& connection) { | SQL_Connection& connection) { |
| Stack *connections; | SYNCHRONIZED; |
| if(!(connections=static_cast<Stack *>(connection_cache.get(url)))) { | |
| // there are no cached connections to that 'url' yet | 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! | connections=NEW Stack(pool()); // NOTE: never freed up! |
| connection_cache.put(url, connections); | connection_cache.put(url, connections); |
| } | } |
| 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() { | |
| time_t now=time(0); | |
| 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; | |
| } | |
| } |