noflo/src/lib/ProcessContext.js

Flow-Based Programming environment for JavaScript

//     NoFlo - Flow-Based Programming for JavaScript
//     (c) 2013-2020 Flowhub UG
//     (c) 2011-2012 Henri Bergius, Nemein
//     NoFlo may be freely distributed under the MIT license

export default class ProcessContext {
  /**
   * @param {import("./IP").default} ip - IP for this processing context
   * @param {import("./Component").Component} nodeInstance - Component being run
   * @param {import("./InPort").default} port - InPort that triggered this context
   * @param {Object<string, any>} result
   */
  constructor(ip, nodeInstance, port, result) {
    this.ip = ip;
    this.nodeInstance = nodeInstance;
    this.port = port;
    this.result = result;
    this.scope = this.ip.scope;
    this.activated = false;
    this.deactivated = false;
  }

  activate() {
    // Push a new result value if previous has been sent already
    /* eslint-disable no-underscore-dangle */
    if (this.result.__resolved || (this.nodeInstance.outputQ.indexOf(this.result) === -1)) {
      this.result = {};
    }
    this.nodeInstance.activate(this);
  }

  deactivate() {
    if (!this.result.__resolved) { this.result.__resolved = true; }
    this.nodeInstance.deactivate(this);
  }
}