s202226701001/sever-test/node_modules/parse-server/lib/Adapters/MessageQueue/EventEmitterMQ.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.EventEmitterMQ = void 0;
var _events = _interopRequireDefault(require("events"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
const emitter = new _events.default.EventEmitter();
const subscriptions = new Map();
function unsubscribe(channel) {
  if (!subscriptions.has(channel)) {
    //console.log('No channel to unsub from');
    return;
  }
  //console.log('unsub ', channel);
  emitter.removeListener(channel, subscriptions.get(channel));
  subscriptions.delete(channel);
}
class Publisher {
  constructor(emitter) {
    this.emitter = emitter;
  }
  publish(channel, message) {
    this.emitter.emit(channel, message);
  }
}
class Consumer extends _events.default.EventEmitter {
  constructor(emitter) {
    super();
    this.emitter = emitter;
  }
  subscribe(channel) {
    unsubscribe(channel);
    const handler = message => {
      this.emit('message', channel, message);
    };
    subscriptions.set(channel, handler);
    this.emitter.on(channel, handler);
  }
  unsubscribe(channel) {
    unsubscribe(channel);
  }
}
function createPublisher() {
  return new Publisher(emitter);
}
function createSubscriber() {
  return new Consumer(emitter);
}
const EventEmitterMQ = exports.EventEmitterMQ = {
  createPublisher,
  createSubscriber
};
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