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// ------------------------------------------------------------------------
// eca-logger.cpp: A logging subsystem implemented as a singleton class
// Copyright (C) 2002 Kai Vehmanen
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// ------------------------------------------------------------------------
#include <kvu_dbc.h>
#include <kvu_locks.h>
#include "eca-logger-interface.h"
#include "eca-logger-default.h"
#include "eca-logger.h"
ECA_LOGGER_INTERFACE* ECA_LOGGER::interface_impl_repp = 0;
pthread_mutex_t ECA_LOGGER::lock_rep = PTHREAD_MUTEX_INITIALIZER;
static const char *level_descs[] = {
"ERROR ", /* 0 */
"INFO ",
"SUBSYST.",
"MODULE ",
"OBJECTS ",
"SYSTEM ",
"FUNCTION",
"CONTINU.",
"EIAM ",
"UNKNOWN " /* 9 */
};
ECA_LOGGER_INTERFACE& ECA_LOGGER::instance(void)
{
//
// Note! Below we use the Double-Checked Locking Pattern
// to protect against concurrent access
if (ECA_LOGGER::interface_impl_repp == 0) {
KVU_GUARD_LOCK guard(&ECA_LOGGER::lock_rep);
if (ECA_LOGGER::interface_impl_repp == 0) {
ECA_LOGGER::interface_impl_repp = new ECA_LOGGER_DEFAULT();
}
}
return(*interface_impl_repp);
}
void ECA_LOGGER::attach_logger(ECA_LOGGER_INTERFACE* logger)
{
int oldloglevel = -1;
if (interface_impl_repp != 0) {
oldloglevel = interface_impl_repp->get_log_level_bitmask();
}
ECA_LOGGER::detach_logger();
if (ECA_LOGGER::interface_impl_repp == 0) {
KVU_GUARD_LOCK guard(&ECA_LOGGER::lock_rep);
if (ECA_LOGGER::interface_impl_repp == 0) {
ECA_LOGGER::interface_impl_repp = logger;
if (oldloglevel != -1) {
logger->set_log_level_bitmask(oldloglevel);
}
}
}
DBC_ENSURE(ECA_LOGGER::interface_impl_repp == logger);
}
/**
* Detaches the current logger implementation.
*/
void ECA_LOGGER::detach_logger(void)
{
if (ECA_LOGGER::interface_impl_repp != 0) {
KVU_GUARD_LOCK guard(&ECA_LOGGER::lock_rep);
if (ECA_LOGGER::interface_impl_repp != 0) {
delete ECA_LOGGER::interface_impl_repp;
ECA_LOGGER::interface_impl_repp = 0;
}
}
DBC_ENSURE(ECA_LOGGER::interface_impl_repp == 0);
}
const char* ECA_LOGGER::level_to_string(ECA_LOGGER::Msg_level_t arg)
{
switch(arg)
{
case ECA_LOGGER::errors: return level_descs[0];
case ECA_LOGGER::info: return level_descs[1];
case ECA_LOGGER::subsystems: return level_descs[2];
case ECA_LOGGER::module_names: return level_descs[3];
case ECA_LOGGER::user_objects: return level_descs[4];
case ECA_LOGGER::system_objects: return level_descs[5];
case ECA_LOGGER::functions: return level_descs[6];
case ECA_LOGGER::continuous: return level_descs[7];
case ECA_LOGGER::eiam_return_values: return level_descs[8];
default: return level_descs[9];
}
}
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