NAME

       log_mf_h - An Event Handler which Logs Events to Disk

DESCRIPTION

       The  log_mf_h is a gen_event handler module which can be installed in any gen_event process. It logs onto
       disk all events which are sent to an event manager. Each event is written as a  binary  which  makes  the
       logging  very  fast.  However,  a  tool such as the Report Browser (rb) must be used in order to read the
       files. The events are written to multiple files. When all files have been used, the first one is  re-used
       and overwritten. The directory location, the number of files, and the size of each file are configurable.
       The directory will include one file called index, and report files 1, 2, .....

DATA TYPES

       args()

              Term to be sent to  gen_event:add_handler/3.

EXPORTS

       init(Dir, MaxBytes, MaxFiles) -> Args

       init(Dir, MaxBytes, MaxFiles, Pred) -> Args

              Types:

                 Dir = file:filename()
                 MaxBytes = integer() >= 0
                 MaxFiles = 1..255
                 Pred = fun((Event :: term()) -> boolean())
                 Args = args()

              Initiates  the  event  handler.  This  function  returns  Args,  which should be used in a call to
              gen_event:add_handler(EventMgr, log_mf_h, Args).

              Dir specifies which directory to use for the log  files.  MaxBytes  specifies  the  size  of  each
              individual  file. MaxFiles specifies how many files are used. Pred is a predicate function used to
              filter the events. If no predicate function is specified, all events are logged.

SEE ALSO

       gen_event(3erl), rb(3erl)

Ericsson AB                                       stdlib 1.19.4                                   log_mf_h(3erl)