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Event Processing Meets Text: Reuters at Gartner
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log_mf_h(3erl) Erlang Module Definition log_mf_h(3erl) 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, .... . EXPORTS
init(Dir, MaxBytes, MaxFiles) init(Dir, MaxBytes, MaxFiles, Pred) -> Args Types Dir = string() MaxBytes = integer() MaxFiles = 0 < integer() < 256 Pred = fun(Event) -> boolean() Event = term() 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 1.17.3 log_mf_h(3erl)
