state-trooper/perf/node_modules/state-trooper/dist/patrol.js

Application State Manager

'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

var _underscore = require('underscore');

var _underscore2 = _interopRequireDefault(_underscore);

var _immutable = require('immutable');

var _immutable2 = _interopRequireDefault(_immutable);

var _jsCsp = require('js-csp');

var _cursor = require('./cursor');

var _cursor2 = _interopRequireDefault(_cursor);

var _convert_to_native = require('./convert_to_native');

var _convert_to_native2 = _interopRequireDefault(_convert_to_native);

var _put_on_chan = require('./put_on_chan');

var _put_on_chan2 = _interopRequireDefault(_put_on_chan);

var _get_state_by_path = require('./get_state_by_path');

var _get_state_by_path2 = _interopRequireDefault(_get_state_by_path);

var _find_closest_transmitter = require('./find_closest_transmitter');

var _find_closest_transmitter2 = _interopRequireDefault(_find_closest_transmitter);

var _find_closest_fetcher_and_query = require('./find_closest_fetcher_and_query');

var _find_closest_fetcher_and_query2 = _interopRequireDefault(_find_closest_fetcher_and_query);

var _apply_state_change = require('./apply_state_change');

var _apply_state_change2 = _interopRequireDefault(_apply_state_change);

var each = _underscore2['default'].each;
var partial = _underscore2['default'].partial;

var findClosestPersister = partial(_find_closest_transmitter2['default'], 'persister');

var patrol = function patrol(stateDescriptor) {
  var dataStore = stateDescriptor.dataStore;

  var mainCursorCh = (0, _jsCsp.chan)();

  var updateCh = (0, _jsCsp.chan)();
  var createCursor = partial(_cursor2['default'], _underscore2['default'], [], updateCh);

  var currentState = _immutable2['default'].fromJS(stateDescriptor.state);
  var rootCursor = createCursor(currentState);
  var unpersistedChanges = [];

  // put initial blank cursor
  (0, _put_on_chan2['default'])(mainCursorCh, createCursor(currentState));

  // fetch initial data
  each(dataStore, function (conf, path) {
    if (conf.fetcher && conf.initialFetch !== false) {
      conf.fetcher(rootCursor.refine(path), rootCursor, conf.query);
    }
  });

  // respond to updates from the cursor
  (0, _jsCsp.go)(regeneratorRuntime.mark(function callee$1$0() {
    var update, _findClosestFetcherAndQuery, fetcher, query, persister;

    return regeneratorRuntime.wrap(function callee$1$0$(context$2$0) {
      while (1) switch (context$2$0.prev = context$2$0.next) {
        case 0:
          update = undefined;

        case 1:
          context$2$0.next = 3;
          return (0, _jsCsp.take)(updateCh);

        case 3:
          if (!(update = context$2$0.sent)) {
            context$2$0.next = 7;
            break;
          }

          if (update.action === 'fetch') {
            _findClosestFetcherAndQuery = (0, _find_closest_fetcher_and_query2['default'])(dataStore, update.path);
            fetcher = _findClosestFetcherAndQuery.fetcher;
            query = _findClosestFetcherAndQuery.query;

            if (fetcher) {
              fetcher(rootCursor.refine(update.path), rootCursor, query);
            }
          } else if (update.action === 'persist') {
            persister = findClosestPersister(dataStore, update.path);

            if (persister) {
              persister(rootCursor.refine(update.path), unpersistedChanges.pop(), rootCursor);
            }

            unpersistedChanges = [];
          } else {
            unpersistedChanges.push(update);
            currentState = (0, _apply_state_change2['default'])(currentState, update);
            rootCursor = createCursor(currentState);

            if (typeof update.callback === 'function') {
              update.callback(rootCursor.refine(update.path), rootCursor);
            }

            (0, _put_on_chan2['default'])(mainCursorCh, rootCursor);
          }
          context$2$0.next = 1;
          break;

        case 7:
        case 'end':
          return context$2$0.stop();
      }
    }, callee$1$0, this);
  }));

  return mainCursorCh;
};

exports['default'] = patrol;
module.exports = exports['default'];