function Invocation(job, fireDate, recurrenceRule, endDate) {
  this.job = job;
  this.fireDate = fireDate;
  this.endDate = endDate;
  this.recurrenceRule = recurrenceRule || DoesntRecur;

  this.timerID = null;
}
function Invocation(job, fireDate, recurrenceRule, endDate) {
  this.job = job;
  this.fireDate = fireDate;
  this.endDate = endDate;
  this.recurrenceRule = recurrenceRule || DoesntRecur;

  this.timerID = null;
}
function Invocation ( job , fireDate , recurrenceRule , endDate ) { this . job = job ; this . fireDate = fireDate ; this . endDate = endDate ; this . recurrenceRule = recurrenceRule || DoesntRecur ; this . timerID = null ; }
/* Invocation object
/ * Invocation object