how to set boost to log different data in 2 different files - boost

Question

I am trying since a few days to set up c++ boost to log different data in 2 different files .
What I managed to get is different files , who all share the same content
The code bellow creates in the log folder , 2 files file.txt and file2.txt with the same content:
file.txt
0: [2019-Feb-14 19:39:01.997479] - thread 2
1: [2019-Feb-14 19:39:02.035582] - thread 1
file2.txt
0: [2019-Feb-14 19:39:01.997479] - thread 2
1: [2019-Feb-14 19:39:02.035582] - thread 1
class logger
{
src::logger_mt lg;
public:
logger(std::string filename)
{
// Create a text file sink
typedef sinks::synchronous_sink< sinks::text_multifile_backend > file_sink;
shared_ptr< file_sink > sink(new file_sink);
// Set up how the file names will be generated
sink->locked_backend()->set_file_name_composer(sinks::file::as_file_name_composer(
expr::stream << "logs/" << filename));
// Set the log record formatter
sink->set_formatter
(
expr::format("%1%: [%2%] - %3%")
% expr::attr< unsigned int >("RecordID")
% expr::attr< boost::posix_time::ptime >("TimeStamp")
% expr::smessage
);
// Add it to the core
logging::core::get()->add_sink(sink);
// Add some attributes too
logging::core::get()->add_global_attribute("TimeStamp", attrs::local_clock());
logging::core::get()->add_global_attribute("RecordID", attrs::counter< unsigned int >());
}
void log(std::string message)
{
BOOST_LOG(lg) << message;
}
};
logger logger1("file2.txt");
logger logger2("file.txt");
// This function is executed in a separate thread
int main(int argc, char* argv[])
{
logger2.log("thread 2");
logger1.log("thread 1");
return 0;
}
I know is a basic question , but i read all the examples from the boost distribution libs\log\example and i couldnt find anything similar.
The help is appreciated.

Answer 1

See this answer, in particular its first half about channels and filters.