--- parser3/src/main/pa_sql_driver_manager.C 2001/11/05 10:21:28 1.49 +++ parser3/src/main/pa_sql_driver_manager.C 2002/09/04 14:59:54 1.65 @@ -1,12 +1,12 @@ /** @file Parser: sql driver manager implementation. - Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) - Author: Alexander Petrosyan (http://design.ru/paf) - - $Id: pa_sql_driver_manager.C,v 1.49 2001/11/05 10:21:28 paf Exp $ + Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com) + Author: Alexandr Petrosian (http://paf.design.ru) */ +static const char* IDENT_SQL_DRIVER_MANAGER_C="$Date: 2002/09/04 14:59:54 $"; + #include "pa_sql_driver_manager.h" #include "ltdl.h" #include "pa_sql_connection.h" @@ -50,20 +50,34 @@ public: virtual void *calloc(size_t size) { return Pooled::calloc(size); } /** + normally we can't 'throw' from dynamic library, so the idea is to #1 jump to C++ some function to main body, where every function stack frame has exception unwind information and from there... #2 propagate_exception() + + but when parser configured --with-sjlj-exceptions + one can simply 'throw' from dynamic library. + [sad story: one can not longjump/throw due to some bug in gcc as of 3.2.1 version] */ virtual void _throw(const char *comment) { // hiding passwords and addresses from accidental show [imagine user forgot @exception] - e=Exception(0, 0, - &url_without_login(pool(), furl), - comment); +#ifdef PA_WITH_SJLJ_EXCEPTIONS + throw +#else + e= +#endif + Exception("sql.connect", + &url_without_login(pool(), furl), + comment); +#ifndef PA_WITH_SJLJ_EXCEPTIONS longjmp(mark, 1); +#endif } virtual void propagate_exception() { +#ifndef PA_WITH_SJLJ_EXCEPTIONS throw e; +#endif } private: @@ -88,28 +102,26 @@ static void expire_connections(const Has // SQL_Driver_manager -SQL_Driver_manager::SQL_Driver_manager(Pool& apool) : Pooled(apool), +SQL_Driver_manager::SQL_Driver_manager(Pool& apool) : Cache_manager(apool), driver_cache(apool), connection_cache(apool), prev_expiration_pass_time(0) { - - status_providers->put(*NEW String(pool(), "sql"), this); } SQL_Driver_manager::~SQL_Driver_manager() { connection_cache.for_each(expire_connections, - reinterpret_cast((time_t)0/*=in past=expire all*/)); + reinterpret_cast(time(0)+1/*=in future=expire all*/)); } /// @param request_url protocol://[driver-dependent] -SQL_Connection& SQL_Driver_manager::get_connection(const String& request_url, +SQL_Connection_ptr SQL_Driver_manager::get_connection(const String& request_url, const String& request_origin, Table *protocol2driver_and_client) { Pool& pool=request_origin.pool(); // request pool // we have table for locating protocol's library if(!protocol2driver_and_client) - throw Exception(0, 0, + throw Exception("parser.runtime", &request_url, "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined"); @@ -117,24 +129,24 @@ SQL_Connection& SQL_Driver_manager::get_ SQL_Driver_services *services=new(pool) SQL_Driver_services_impl(pool, request_url); // first trying to get cached connection - SQL_Connection *result=get_connection_from_cache(request_url); - if(result) { - result->set_services(services); - if(!result->ping()) { // we have some cached connection, is it pingable? - result->disconnect(); // kill unpingabe=dead connection - result=0; + SQL_Connection *connection=get_connection_from_cache(request_url); + if(connection) { + connection->set_services(services); + if(!connection->ping()) { // we have some cached connection, is it pingable? + connection->disconnect(); // kill unpingabe=dead connection + connection=0; } } char *request_url_cstr; - if(result) + if(connection) request_url_cstr=0; // calm, compiler else { // no cached connection or it were unpingabe: connect/reconnect int pos=request_url.pos("://", 3); if(pos<0) - throw Exception(0, 0, + throw Exception("parser.runtime", request_url.size()?&request_url:&request_origin, - "connection string must start with protocol://"); // NOTE: not THROW, but PTHROW + "connection string must start with protocol://"); // make global_url C-string on global pool request_url_cstr=request_url.cstr(); @@ -155,40 +167,40 @@ SQL_Connection& SQL_Driver_manager::get_ 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; + const String *dlopen_file_spec=0; if(protocol2driver_and_client->locate(0, global_protocol)) { if(!(library=protocol2driver_and_client->item(1)) || library->size()==0) - throw Exception(0, 0, + throw Exception("parser.runtime", 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 - throw Exception(0, 0, + throw Exception("parser.runtime", &request_url, "undefined protocol '%s'", request_protocol_cstr); if(lt_dlinit()) - throw Exception(0, 0, + throw Exception(0, library, "prepare to dynamic loading failed, %s", lt_dlerror()); const char *filename=library->cstr(String::UL_FILE_SPEC); lt_dlhandle handle=lt_dlopen(filename); if (!handle) - throw Exception(0, 0, + throw Exception(0, library, "can not open the module, %s", lt_dlerror()); SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, SQL_DRIVER_CREATE_NAME); if(!create) - throw Exception(0, 0, + throw Exception(0, library, "function '"SQL_DRIVER_CREATE_NAME"' was not found"); @@ -198,22 +210,21 @@ SQL_Connection& SQL_Driver_manager::get_ // validate driver api version int driver_api_version=driver->api_version(); if(driver_api_version!=SQL_DRIVER_API_VERSION) - throw Exception(0, 0, + throw Exception(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 - 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; + char *dlopen_file_spec_cstr= + dlopen_file_spec && dlopen_file_spec->size()? + dlopen_file_spec->cstr(String::UL_AS_IS):0; if(const char *error=driver->initialize( dlopen_file_spec_cstr)) - throw Exception(0, 0, + throw Exception(0, library, "driver failed to initialize client library '%s', %s", - specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed", + dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed", error); // cache it @@ -223,16 +234,16 @@ SQL_Connection& SQL_Driver_manager::get_ // allocate in global pool // associate with services[request] // NOTE: never freed up! - result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver); + connection=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver); // associate with services[request] (deassociates at close) - result->set_services(services); + connection->set_services(services); } - // if not connected yet, do that now, when result has services - if(!result->connected()) - result->connect(request_url_cstr); - // return it - return *result; + // if not connected yet, do that now, when connection has services + if(!connection->connected()) + connection->connect(request_url_cstr); + // return autoclosing object for it + return SQL_Connection_ptr(connection); } void SQL_Driver_manager::close_connection(const String& url, @@ -263,8 +274,6 @@ void SQL_Driver_manager::put_driver_to_c SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) { SYNCHRONIZED; - maybe_expire_connection_cache(); - if(Stack *connections=static_cast(connection_cache.get(url))) while(connections->top_index()>=0) { // there are cached connections to that 'url' SQL_Connection *result=static_cast(connections->pop()); @@ -287,7 +296,7 @@ void SQL_Driver_manager::put_connection_ connections->push(&connection); } -void SQL_Driver_manager::maybe_expire_connection_cache() { +void SQL_Driver_manager::maybe_expire_cache() { time_t now=time(0); if(prev_expiration_pass_time=0; ) add_connection_to_status_cache_table(iter.next(), info); } - - Value& SQL_Driver_manager::get_status(Pool& pool, const String *source) { VHash& result=*new(pool) VHash(pool); // cache { - Array& columns=*new(pool) Array(pool, 3); + Array& columns=*new(pool) Array(pool); columns+=new(pool) String(pool, "url"); columns+=new(pool) String(pool, "time"); Table& table=*new(pool) Table(pool, 0, &columns, connection_cache.size()); @@ -341,4 +350,4 @@ Value& SQL_Driver_manager::get_status(Po } return result; -} \ No newline at end of file +}