--- parser3/src/main/pa_sql_driver_manager.C 2001/04/04 11:47:29 1.2 +++ parser3/src/main/pa_sql_driver_manager.C 2001/05/17 10:12:28 1.14 @@ -5,15 +5,15 @@ Author: Alexander Petrosyan (http://design.ru/paf) - $Id: pa_sql_driver_manager.C,v 1.2 2001/04/04 11:47:29 paf Exp $ + $Id: pa_sql_driver_manager.C,v 1.14 2001/05/17 10:12:28 parser Exp $ */ -#include "pa_config_includes.h" -#include "ltdl.h" #include "pa_sql_driver_manager.h" +#include "ltdl.h" #include "pa_sql_connection.h" #include "pa_exception.h" #include "pa_common.h" +#include "pa_threads.h" // globals @@ -24,57 +24,101 @@ SQL_Driver_manager *SQL_driver_manager; const int MAX_PROTOCOL=20; const char *LIBRARY_CREATE_FUNC_NAME="create"; -// url: -// protocol://user:pass@host:port/database -// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this is driver-dependent -SQL_Connection& SQL_Driver_manager::get_connection(const String& url, - Table *protocol2library) { - SYNCHRONIZED(true); - Pool& pool=url.pool(); // request pool +/// 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 + +/// @param request_url protocol://[driver-dependent] +SQL_Connection& SQL_Driver_manager::get_connection(const String& request_url, + Table *protocol2driver_and_client) { + Pool& pool=request_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_url, + "$SQL:drivers table must be defined"); + + // services associated with request + SQL_Driver_services_impl& services= + *new(pool) SQL_Driver_services_impl(pool, request_url); // 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_url)) + if(result->ping()) { + result->set_services(&services); + return *result; + } else + result->disconnect(); // kill unpingabe=dead connection // no cached connection - int pos=url.pos("://", 3); + int pos=request_url.pos("://", 3); if(pos<0) PTHROW(0, 0, - &url, + &request_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); + // make global_url C-string on global pool + char *request_url_cstr=request_url.cstr(String::UL_AS_IS); + char *global_url_cstr=(char *)malloc(strlen(request_url_cstr)+1); + strcpy(global_url_cstr, request_url_cstr); + // make global_url string on global pool + String& global_url=*new(this->pool()) String(this->pool(), global_url_cstr); - char *protocol_cstr=lsplit(&url_cstr, ':'); - String& protocol=*new(this->pool()) String(this->pool(), protocol_cstr); - - // skip // after : - while(*url_cstr=='/') - 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(protocol))) { + if(!(driver=get_driver_from_cache(global_protocol))) { // no cached const String *library=0; - if(protocol2library->locate(0, protocol)) { - if(!(library=protocol2library->item(1)) || library->size()==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); + 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", + request_protocol_cstr); } else PTHROW(0, 0, - &url, - "undefined protocol '%s'", protocol_cstr); + &request_url, + "undefined protocol '%s'", + request_protocol_cstr); const char *filename=library->cstr(String::UL_FILE_NAME); lt_dlhandle handle=lt_dlopen(filename); @@ -95,25 +139,36 @@ SQL_Connection& SQL_Driver_manager::get_ // validate driver api version int driver_api_version=driver->api_version(); - if(driver_api_versioncstr(String::UL_FILE_NAME); + if(const char *error=driver->initialize( + dlopen_file_spec_cstr)) + PTHROW(0, 0, + library, + "driver failed to initialize client library '%s', %s", + dlopen_file_spec_cstr, error); // cache it - put_driver_to_cache(protocol, *driver); + put_driver_to_cache(global_protocol, *driver); } - return *new(this->pool()) SQL_Connection(url.pool(), //< associate with request - *driver, url_cstr, url); + // allocate in global pool + // associate with services[request], deassociates at close + SQL_Connection& result= + *new(this->pool()) SQL_Connection(this->pool(), + global_url, *driver, services, request_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); } @@ -121,6 +176,8 @@ void SQL_Driver_manager::close_connectio // driver cache SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) { + SYNCHRONIZED; + if(SQL_Driver *result=static_cast(driver_cache.get(protocol))) return result; @@ -129,12 +186,16 @@ SQL_Driver *SQL_Driver_manager::get_driv void SQL_Driver_manager::put_driver_to_cache(const String& protocol, SQL_Driver& driver) { + SYNCHRONIZED; + driver_cache.put(protocol, &driver); } // connection cache SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) { + SYNCHRONIZED; + if(Stack *connections=static_cast(connection_cache.get(url))) if(connections->size()) // there are cached connections to that 'url' return static_cast(connections->pop()); @@ -142,9 +203,11 @@ SQL_Connection *SQL_Driver_manager::get_ return 0; } -/// @todo cache expiration[use SQL_Driver::disconnect], pinging. +/// @todo cache expiration[use SQL_Driver::disconnect] void SQL_Driver_manager::put_connection_to_cache(const String& url, SQL_Connection& connection) { + SYNCHRONIZED; + Stack *connections; if(!(connections=static_cast(connection_cache.get(url)))) { // there are no cached connections to that 'url' yet