@thi.ng/rstream/post-worker.js

Reactive streams & subscription primitives for constructing dataflow graphs / pipelines

import { isTransferable } from "@thi.ng/checks/is-transferable";
import { isTypedArray } from "@thi.ng/checks/is-typedarray";
import { LOGGER } from "./logger.js";
import { defWorker } from "./defworker.js";
const postWorker = (worker, transfer = false, terminate = 0) => {
  const _worker = defWorker(worker);
  return {
    next(x) {
      if (x instanceof Promise) {
        x.then((y) => this.next(y));
        return;
      }
      let tx;
      if (transfer) {
        const ta = isTypedArray(x);
        if (ta || isTransferable(x)) {
          tx = [ta ? x.buffer : x];
        }
      }
      _worker.postMessage(x, tx || []);
    },
    done() {
      if (terminate > 0) {
        setTimeout(() => {
          LOGGER.info("terminating worker...");
          _worker.terminate();
        }, terminate);
      }
    }
  };
};
export {
  postWorker
};