The FEE Server Control Engine of the ALICE-TRD - Westfälische ...

5 The FEEServer Control Engine
at the end of the message. LogBufferManager contains a list of pointers to all output channels.
The function sync(void) loops through the list and calls the function void sync(string
message, string source, loglevel) of each output channel. These sync functions decide depending
on the loglevel if the message should be printed out and do the actual output.
All classes for the different output channel types are derived from the abstract class
LogBuffer. At the moment there are four different output classes available. The class
CoutLogBuffer provides an interface to STDOUT, the class FileLogBuffer writes the log messages
to a file, the class SyslogLogBuffer prints it out to the Linux logging system and the
class ODimLogBuffer publishes the log messages via the FEEServer to the DIM system.
Even though the system is quite complex the usage is simple. During the initialization
of the control engine one DIM logging channel and one syslog channel are created. The
syntax for the DIM channel is for example tlog .addStream("dimlog", new ODimLogBuffer(
einfo));. The parameter dimlog is the name of the channel and used to identify the channel.
The second parameter ODimLogBuffer(edebug) specifies the type of the new channel and
the log level of this channel. The syntax for the syslog channel is the same. After the
initialization of the two channels, the command tlog