CountQueuingStrategy

{{APIRef("Streams")}}{{AvailableInWorkers}}

The CountQueuingStrategy interface of the Streams API provides a built-in chunk counting queuing strategy that can be used when constructing streams.

Constructor

• {{domxref("CountQueuingStrategy.CountQueuingStrategy", "CountQueuingStrategy()")}}
  • : Creates a new CountQueuingStrategy object instance.

Instance properties

• {{domxref("CountQueuingStrategy.highWaterMark")}} {{ReadOnlyInline}}
  • : The total number of chunks that can be contained in the internal queue before backpressure is applied.

Instance methods

• {{domxref("CountQueuingStrategy.size()")}}
  • : Always returns 1.

Examples

const queueingStrategy = new CountQueuingStrategy({ highWaterMark: 1 });

const writableStream = new WritableStream(
  {
    // Implement the sink
    write(chunk) {
      // …
    },
    close() {
      // …
    },
    abort(err) {
      console.log("Sink error:", err);
    },
  },
  queueingStrategy,
);

const size = queueingStrategy.size();

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{domxref("Streams API", "Streams API", "", "nocode")}}
• {{domxref("CountQueuingStrategy.CountQueuingStrategy", "CountQueuingStrategy()")}} constructor
• Internal queues and queuing strategies