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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)