Function enqueue

docs/app/js/sanddance-app.js:108566–108573

* Enqueue an operator into the priority queue for evaluation. The operator * will be enqueued if it has no registered pulse for the current cycle, or if * the force argument is true. Upon enqueue, this method also sets the * operator's qrank to the current rank value. * @param {Operator} op - Th

(op, force)

 *   enqueued during the current pulse propagation. This is useful when the
 *   dataflow graph is dynamically modified and the operator rank changes.
 */ function enqueue(op, force) {
    const q = op.stamp < this._clock;
    if (q) op.stamp = this._clock;
    if (q || force) {
        op.qrank = op.rank;
        this._heap.push(op);
    }
}
/**
 * Provide a correct pulse for evaluating an operator. If the operator has an
 * explicit source operator, we will try to pull the pulse(s) from it.