Simple statistics

Simple statistics supports counting events, store events and fetch events. The Core idea is that this module is cleared after a certain amount of time - and its content is logged.

Example Code

const Statistics = require('./index.js');
const statistics = new Statistics();
statistics.setValue('hostname', 'foo');
statistics.increaseCounter('event 1');
statistics.increaseCounter('event 2', 50);
statistics.addErrorMessage('ERROR_EOF');
statistics.addErrorMessage('INVALID_PARAMETER');

const eventsLastHour = statistics.getStatistic();
const errorsLastHour = statistics.getLastErrors();
statistics.clearStatistics();

Result:

> eventsLastHour
{ 'event 1': 1, 'event 2': 50, hostname: 'foo' }
> errorsLastHour
{ '0': 'ERROR_EOF', '1': 'INVALID_PARAMETER' }

API

Constructor

• new Statistics({ errorEntriesToTrack: 10 });: The parameter is optional, default errorEntriesToTrack is set to 10.

setValue

• statistics.setValue(key, value);: Sets key to value, existing keys will be overwritten.

increaseCounter

• statistics.increaseCounter(key);: increase key number, if key was not defined before, it will be initialised to 1.
• statistics.increaseCounter(key, increaseNumber);: increase key number, if key was not defined before, it will be initialised to increaseNumber.

addErrorMessage

• statistics.addErrorMessage(error);: adds an error message. If more than errorEntriesToTrack are added, the oldest entry gets overwritten.

getStatistic

• statistics.getStatistic(): returns the collected events as JSON object.

getLastErrors

• statistics.getLastErrors(): returns the collected errors as JSON object.

clearStatistics

• statistics.clearStatistics(): Cleans error and event statistics.