public Long getClusterId() {
    return clusterId;
  }
Constructor.

@param clusterId (beware, may be null if action is not bound to cluster)
@param hostname host that is an origin for a command report
@param report full command report (may be null if action has been cancelled)
@param emulated true, if event was generated without actually receiving
data from agent (e.g. if we did not perform action, or action timed out,
but we want to trigger event listener anyway). More loose checks against
data will be performed in this case.
ambari-server/src/main/java/org/apache/ambari/server/events/ActionFinalReportReceivedEvent.java