--- parser3/src/main/pa_sql_driver_manager.C 2001/04/04 10:53:57 1.1 +++ parser3/src/main/pa_sql_driver_manager.C 2001/04/26 10:16:07 1.9 @@ -5,12 +5,13 @@ Author: Alexander Petrosyan (http://design.ru/paf) - $Id: pa_sql_driver_manager.C,v 1.1 2001/04/04 10:53:57 paf Exp $ + $Id: pa_sql_driver_manager.C,v 1.9 2001/04/26 10:16:07 paf Exp $ */ #include "pa_config_includes.h" #include "ltdl.h" #include "pa_sql_driver_manager.h" +#include "pa_sql_connection.h" #include "pa_exception.h" #include "pa_common.h" @@ -23,35 +24,65 @@ SQL_Driver_manager *SQL_driver_manager; const int MAX_PROTOCOL=20; const char *LIBRARY_CREATE_FUNC_NAME="create"; + +/// SQL_Driver_services Pooled implementation +class SQL_Driver_services_impl : public SQL_Driver_services, public Pooled { +public: + SQL_Driver_services_impl(Pool& apool, const String& aurl) : Pooled(apool), + furl(aurl) { + } + + /// allocates some bytes on pool + void *malloc(size_t size) { return Pooled::malloc(size); } + /// allocates some bytes clearing them with zeros + void *calloc(size_t size) { return Pooled::calloc(size); } + /// throw exception + void _throw(const char *comment) { + THROW(0, 0, + &furl, + comment); + } + +private: + const String& furl; +}; + +// SQL_Driver_manager + // url: // protocol://user:pass@host:port/database // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this is driver-dependent -SQL_Connection& SQL_Driver_manager::get_connection(const String& url, - Table *protocol2library) { +SQL_Connection& SQL_Driver_manager::get_connection(const String& request_owned_url, + Table *protocol2driver_and_client) { SYNCHRONIZED(true); - Pool& pool=url.pool(); // request pool + Pool& pool=request_owned_url.pool(); // request pool // we have table for locating protocol's library - if(!protocol2library) + if(!protocol2driver_and_client) PTHROW(0, 0, - &url, - "SQL:drivers table must be defined"); + &request_owned_url, + "$SQL:drivers table must be defined"); // first trying to get cached connection - if(SQL_Connection *result=get_connection_from_cache(url)) - return *result; + if(SQL_Connection *result=get_connection_from_cache(request_owned_url)) + if(result->ping()) + return *result; + else + result->disconnect(); // kill unpingabe=dead connection // no cached connection - int pos=url.pos("://", 3); + int pos=request_owned_url.pos("://", 3); if(pos<0) PTHROW(0, 0, - &url, + &request_owned_url, "no protocol specified"); // NOTE: not THROW, but PTHROW - // make url string on global pool + // make url C-string on global pool char *url_cstr=(char *)malloc(MAX_STRING); - strncpy(url_cstr, url.cstr(String::UL_AS_IS), MAX_STRING); + strncpy(url_cstr, request_owned_url.cstr(String::UL_AS_IS), MAX_STRING); + // make url string on global pool + String& url=*new(this->pool()) String(this->pool(), url_cstr); char *protocol_cstr=lsplit(&url_cstr, ':'); String& protocol=*new(this->pool()) String(this->pool(), protocol_cstr); @@ -61,22 +92,27 @@ SQL_Connection& SQL_Driver_manager::get_ url_cstr++; SQL_Driver *driver; + const String *dlopen_file_spec=0; // first trying to get cached driver if(!(driver=get_driver_from_cache(protocol))) { // no cached const String *library=0; - if(protocol2library->locate(0, protocol)) { - if(!(library=protocol2library->item(1))) + if(protocol2driver_and_client->locate(0, 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", protocol_cstr); + if(!(dlopen_file_spec=protocol2driver_and_client->item(2)) || dlopen_file_spec->size()==0) PTHROW(0, 0, - protocol2library->origin_string(), - "library column for protocol '%s' is empty", protocol_cstr); + protocol2driver_and_client->origin_string(), + "client library column for protocol '%s' is empty", protocol_cstr); } else PTHROW(0, 0, - protocol2library->origin_string(), - "protocol '%s' not found", protocol_cstr); + &url, + "undefined protocol '%s'", protocol_cstr); const char *filename=library->cstr(String::UL_FILE_NAME); - lt_dlhandle handle = lt_dlopen(filename); + lt_dlhandle handle=lt_dlopen(filename); if (!handle) PTHROW(0, 0, library, @@ -89,37 +125,47 @@ SQL_Connection& SQL_Driver_manager::get_ library, "function '%s' was not found", LIBRARY_CREATE_FUNC_NAME); - // create library-driver + // create library-driver! driver=(*create)(); // validate driver api version int driver_api_version=driver->api_version(); - if(driver_api_version < SQL_API_VERSION) + if(driver_api_version!=SQL_DRIVER_API_VERSION) + PTHROW(0, 0, + library, + "driver implements API version 0x%04X not equal to 0x%04X", + driver_api_version, SQL_DRIVER_API_VERSION); + + // initialise by connecting to sql client dynamic link library + const char *dlopen_file_spec_cstr=dlopen_file_spec->cstr(String::UL_FILE_NAME); + if(const char *error=driver->initialize( + dlopen_file_spec_cstr)) PTHROW(0, 0, library, - "driver API version is 0x%04X while current minimum is 0x%04X", - driver_api_version, SQL_API_VERSION); + "driver failed to initialize client library '%s', %s", + dlopen_file_spec_cstr, error); // cache it put_driver_to_cache(protocol, *driver); } - void *info; - char *error; - if(!driver->connect(url_cstr, &info, &error)) - PTHROW(0, 0, - &url, - "can not connect - %s", error); - - return *new(this->pool()) SQL_Connection(url.pool(), //< associate with request - *driver, info, url); + // services associated with request + SQL_Driver_services_impl& services= + *new(pool) SQL_Driver_services_impl(pool, url); + + // allocate in global pool + // associate with services[request], deassociates at close + SQL_Connection& result= + *new(this->pool()) SQL_Connection(this->pool(), + url, *driver, services, url_cstr); + + return result; } void SQL_Driver_manager::close_connection(const String& url, SQL_Connection& connection) { SYNCHRONIZED(true); - connection.set_pool(0); // deassociate from request put_connection_to_cache(url, connection); } @@ -148,6 +194,7 @@ SQL_Connection *SQL_Driver_manager::get_ return 0; } +/// @todo cache expiration[use SQL_Driver::disconnect], pinging. void SQL_Driver_manager::put_connection_to_cache(const String& url, SQL_Connection& connection) { Stack *connections;