code: public boolean containsJobId(int jobId) {
          for (int i = mJobSet.size() - 1; i >= 0; i--) {
              JobStatus ts = mJobSet.valueAt(i);
              if (ts.matches(jobId)) {
                  return true;
              }
          }
          return false;
      }
docs: Whether this jobStatus object already exists in the JobStore.