parser3/src/main/pa_sql_driver_manager.C - diff

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Diff for /parser3/src/main/pa_sql_driver_manager.C between versions 1.15 and 1.32

version 1.15, 2001/05/17 12:51:05	version 1.32, 2001/09/05 09:22:45
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_sql_driver_manager.h"	#include "pa_sql_driver_manager.h"
#include "ltdl.h"	#include "ltdl.h"
Line 17	Line 16

#include "pa_sapi.h"	#include "pa_sapi.h"

	// helper macros

	#define STRINGIZE(name) #name

// globals	// globals

SQL_Driver_manager *SQL_driver_manager;	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;


/// SQL_Driver_services Pooled implementation	/// SQL_Driver_services Pooled implementation
Line 60 SQL_Connection& SQL_Driver_manager::get_	Line 63 SQL_Connection& SQL_Driver_manager::get_
if(!protocol2driver_and_client)	if(!protocol2driver_and_client)
PTHROW(0, 0,	PTHROW(0, 0,
&request_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
SQL_Connection *result=get_connection_from_cache(request_url);	SQL_Connection *result=get_connection_from_cache(request_url);
Line 69 SQL_Connection& SQL_Driver_manager::get_	Line 72 SQL_Connection& SQL_Driver_manager::get_
result=0;	result=0;
}	}

if(!result) { // no cached connection or it were unpingabe: connect/reconnect	char *request_url_cstr;
	if(result)
	request_url_cstr=0; // calm, compiler
	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,
Line 77 SQL_Connection& SQL_Driver_manager::get_	Line 83 SQL_Connection& SQL_Driver_manager::get_
"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
char *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
Line 106 SQL_Connection& SQL_Driver_manager::get_	Line 112 SQL_Connection& SQL_Driver_manager::get_
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);
if(!(dlopen_file_spec=protocol2driver_and_client->item(2)) \|\| dlopen_file_spec->size()==0)	dlopen_file_spec=protocol2driver_and_client->item(2);
PTHROW(0, 0,
protocol2driver_and_client->origin_string(),
"client library column for protocol '%s' is empty",
request_protocol_cstr);
} else	} else
PTHROW(0, 0,	PTHROW(0, 0,
&request_url,	&request_url,
"undefined protocol '%s'",	"undefined protocol '%s'",
request_protocol_cstr);	request_protocol_cstr);

	if(lt_dlinit())
	PTHROW(0, 0,
	library,
	"prepare to dynamic loading failed, %s", lt_dlerror());

const char *filename=library->cstr(String::UL_FILE_NAME);	const char *filename=library->cstr(String::UL_FILE_NAME);
lt_dlhandle handle=lt_dlopen(filename);	lt_dlhandle handle=lt_dlopen(filename);
if (!handle)	if (!handle)
Line 125 SQL_Connection& SQL_Driver_manager::get_	Line 132 SQL_Connection& SQL_Driver_manager::get_
"can not open the module, %s", lt_dlerror());	"can not open the module, %s", lt_dlerror());

SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,	SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle,
LIBRARY_CREATE_FUNC_NAME);	STRINGIZE(SQL_DRIVER_CREATE));
if(!create)	if(!create)
PTHROW(0, 0,	PTHROW(0, 0,
library,	library,
"function '%s' was not found", LIBRARY_CREATE_FUNC_NAME);	"function '%s' was not found", STRINGIZE(SQL_DRIVER_CREATE));

// create library-driver!	// create library-driver!
driver=(*create)();	driver=(*create)();
Line 143 SQL_Connection& SQL_Driver_manager::get_	Line 150 SQL_Connection& SQL_Driver_manager::get_
driver_api_version, SQL_DRIVER_API_VERSION);	driver_api_version, SQL_DRIVER_API_VERSION);

// initialise by connecting to sql client dynamic link library	// initialise by connecting to sql client dynamic link library
const char *dlopen_file_spec_cstr=dlopen_file_spec->cstr(String::UL_FILE_NAME);	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_NAME):0;
if(const char *error=driver->initialize(	if(const char *error=driver->initialize(
dlopen_file_spec_cstr))	dlopen_file_spec_cstr))
PTHROW(0, 0,	PTHROW(0, 0,
library,	library,
"driver failed to initialize client library '%s', %s",	"driver failed to initialize client library '%s', %s",
dlopen_file_spec_cstr, error);	specified_dlopen_file_spec?dlopen_file_spec_cstr:"unspecifed",
	error);

// cache it	// cache it
put_driver_to_cache(global_protocol, *driver);	put_driver_to_cache(global_protocol, *driver);
}	}

// allocate in global pool	// allocate in global pool
// associate with services[request], deassociates at close	// associate with services[request]
result=new(this->pool()) SQL_Connection(this->pool(),	// NOTE: never freed up!
global_url, *driver, request_url_cstr);	result=new(this->pool()) SQL_Connection(this->pool(), global_url, *driver);
}	}

// associate with services[request]	// associate with services[request] (deassociates at close)
result->set_services(new(pool) SQL_Driver_services_impl(pool, request_url));	result->set_services(new(pool) SQL_Driver_services_impl(pool, request_url));
SAPI::log(pool, "get_connection: %p", result);	// if not connected yet, do that now, when result has services
	if(!result->connected())
	result->connect(request_url_cstr);
	// return it
return *result;	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) {
Pool& pool) {
SAPI::log(pool, "close_connection: %p", &connection);
// deassociate from services[request]	// deassociate from services[request]
connection.set_services(0);	connection.set_services(0);
put_connection_to_cache(url, connection);	put_connection_to_cache(url, connection);
Line 193 void SQL_Driver_manager::put_driver_to_c	Line 205 void SQL_Driver_manager::put_driver_to_c
}	}

// 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;	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->top_index()>=0) // 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]
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) {
SYNCHRONIZED;	SYNCHRONIZED;
Line 216 void SQL_Driver_manager::put_connection_	Line 232 void SQL_Driver_manager::put_connection_
}	}
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;
	}
	}

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Removed from v.1.15
changed lines
	Added in v.1.32