microlink/cjs/batch.js

Comlink Alternative. Built with JSON-RPC.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = batch;
function batch(action, {
  size = 1,
  wait = Infinity
}) {
  let timeout = null;
  let current = [];
  return params => {
    const batch = current;
    const send = async () => {
      Promise.resolve(action(batch.map(it => it.params))).then(results => {
        results.forEach((result, i) => {
          batch[i].resolve(result);
        });
      });
    };
    return new Promise((resolve, reject) => {
      batch.push({
        resolve,
        params,
        reject
      });
      if (batch.length === size) {
        if (timeout) {
          clearTimeout(timeout);
          timeout = null;
        }
        send();
        current = [];
      } else if (!timeout && wait !== Infinity) {
        timeout = setTimeout(function () {
          // check if batch already sent
          if (current === batch) {
            current = [];
            clearTimeout(timeout);
            timeout = null;
            send();
          }
        }, wait);
      }
    });
  };
}