pubnub/lib/core/components/deduping_manager.js

Publish & Subscribe Real-time Messaging with PubNub

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;

var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));

var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));

var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));

var _config = _interopRequireDefault(require("../components/config"));

var _flow_interfaces = require("../flow_interfaces");

var hashCode = function hashCode(payload) {
  var hash = 0;
  if (payload.length === 0) return hash;

  for (var i = 0; i < payload.length; i += 1) {
    var character = payload.charCodeAt(i);
    hash = (hash << 5) - hash + character;
    hash = hash & hash;
  }

  return hash;
};

var _default = function () {
  function _default(_ref) {
    var config = _ref.config;
    (0, _classCallCheck2["default"])(this, _default);
    (0, _defineProperty2["default"])(this, "_config", void 0);
    (0, _defineProperty2["default"])(this, "hashHistory", void 0);
    this.hashHistory = [];
    this._config = config;
  }

  (0, _createClass2["default"])(_default, [{
    key: "getKey",
    value: function getKey(message) {
      var hashedPayload = hashCode(JSON.stringify(message.payload)).toString();
      var timetoken = message.publishMetaData.publishTimetoken;
      return "".concat(timetoken, "-").concat(hashedPayload);
    }
  }, {
    key: "isDuplicate",
    value: function isDuplicate(message) {
      return this.hashHistory.includes(this.getKey(message));
    }
  }, {
    key: "addEntry",
    value: function addEntry(message) {
      if (this.hashHistory.length >= this._config.maximumCacheSize) {
        this.hashHistory.shift();
      }

      this.hashHistory.push(this.getKey(message));
    }
  }, {
    key: "clearHistory",
    value: function clearHistory() {
      this.hashHistory = [];
    }
  }]);
  return _default;
}();

exports["default"] = _default;
module.exports = exports.default;
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