@loaders.gl/core/dist/es6/worker-utils/worker-farm.js

Framework-independent loaders for 3D graphics formats

import WorkerPool from './worker-pool';
const DEFAULT_MAX_CONCURRENCY = 5;
export default class WorkerFarm {
  constructor({
    maxConcurrency = DEFAULT_MAX_CONCURRENCY,
    onMessage,
    onDebug = () => {}
  }) {
    this.maxConcurrency = maxConcurrency;
    this.onMessage = onMessage;
    this.onDebug = onDebug;
    this.workerPools = new Map();
  }

  setProps(props) {
    if ('maxConcurrency' in props) {
      this.maxConcurrency = props.maxConcurrency;
    }

    if ('onDebug' in props) {
      this.onDebug = props.onDebug;
    }
  }

  destroy() {
    this.workerPools.forEach(workerPool => workerPool.destroy());
  }

  async process(workerSource, workerName, data) {
    const workerPool = this._getWorkerPool(workerSource, workerName);

    return workerPool.process(data);
  }

  _getWorkerPool(workerSource, workerName) {
    let workerPool = this.workerPools.get(workerName);

    if (!workerPool) {
      workerPool = new WorkerPool({
        source: workerSource,
        name: workerName,
        onMessage: this.onMessage,
        maxConcurrency: this.maxConcurrency,
        onDebug: this.onDebug
      });
      this.workerPools.set(workerName, workerPool);
    }

    return workerPool;
  }

}
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