// The function registers two sinks - one for statistic information,
// and another one for other records
void init()
{
boost::shared_ptr< logging::core > core = logging::core::get();
// Create a backend and attach a stream to it
boost::shared_ptr< sinks::text_ostream_backend > backend =
boost::make_shared< sinks::text_ostream_backend >();
backend->add_stream(
boost::shared_ptr< std::ostream >(new std::ofstream("test.log")));
// Create a frontend and setup filtering
typedef sinks::synchronous_sink< sinks::text_ostream_backend > log_sink_type;
boost::shared_ptr< log_sink_type > log_sink(new log_sink_type(backend));
// All records that don't have a "StatisticStream" attribute attached
// will go to the "test.log" file
log_sink->set_filter(!expr::has_attr(stat_stream));
core->add_sink(log_sink);
// Create another sink that will receive all statistic data
typedef sinks::synchronous_sink< my_stat_accumulator > stat_sink_type;
boost::shared_ptr< stat_sink_type > stat_sink(new stat_sink_type());
// All records with a "StatisticStream" string attribute attached
// will go to the my_stat_accumulator sink
stat_sink->set_filter(expr::has_attr(stat_stream));
core->add_sink(stat_sink);
}
void
lprintf(log_level_t level, const char *fmt, ...) {
if (level < global_log_level)
return;
va_list ap1;
va_list ap2;
char *msg;
int len;
va_start(ap1, fmt);
va_copy(ap2, ap1);
len = vsnprintf(NULL, 0, fmt, ap1);
msg = malloc(len + 1);
if (msg) {
vsnprintf(msg, len + 1, fmt, ap2);
log_sink(level, msg, log_data);
free(msg);
}
va_end(ap2);
va_end(ap1);
}
