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Viewing file:     index.js (10.72 KB)      -rw-r--r--

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * A `DataLoader` creates a public API for loading data from a particular
 * data back-end with unique keys such as the `id` column of a SQL table or
 * document name in a MongoDB database, given a batch loading function.
 *
 * Each `DataLoader` instance contains a unique memoized cache. Use caution when
 * used in long-lived applications or those which serve many users with
 * different access permissions and consider creating a new instance per
 * web request.
 */


// Optionally turn off batching or caching or provide a cache key function or a
// custom cache instance.
var DataLoader = function () {
  function DataLoader(batchLoadFn, options) {
    _classCallCheck(this, DataLoader);

    if (typeof batchLoadFn !== 'function') {
      throw new TypeError('DataLoader must be constructed with a function which accepts ' + ('Array<key> and returns Promise<Array<value>>, but got: ' + batchLoadFn + '.'));
    }
    this._batchLoadFn = batchLoadFn;
    this._options = options;
    this._promiseCache = getValidCacheMap(options);
    this._queue = [];
  }

  // Private


  /**
   * Loads a key, returning a `Promise` for the value represented by that key.
   */
  DataLoader.prototype.load = function load(key) {
    var _this = this;

    if (key === null || key === undefined) {
      throw new TypeError('The loader.load() function must be called with a value,' + ('but got: ' + String(key) + '.'));
    }

    // Determine options
    var options = this._options;
    var shouldBatch = !options || options.batch !== false;
    var shouldCache = !options || options.cache !== false;
    var cacheKeyFn = options && options.cacheKeyFn;
    var cacheKey = cacheKeyFn ? cacheKeyFn(key) : key;

    // If caching and there is a cache-hit, return cached Promise.
    if (shouldCache) {
      var cachedPromise = this._promiseCache.get(cacheKey);
      if (cachedPromise) {
        return cachedPromise;
      }
    }

    // Otherwise, produce a new Promise for this value.
    var promise = new Promise(function (resolve, reject) {
      // Enqueue this Promise to be dispatched.
      _this._queue.push({ key: key, resolve: resolve, reject: reject });

      // Determine if a dispatch of this queue should be scheduled.
      // A single dispatch should be scheduled per queue at the time when the
      // queue changes from "empty" to "full".
      if (_this._queue.length === 1) {
        if (shouldBatch) {
          // If batching, schedule a task to dispatch the queue.
          enqueuePostPromiseJob(function () {
            return dispatchQueue(_this);
          });
        } else {
          // Otherwise dispatch the (queue of one) immediately.
          dispatchQueue(_this);
        }
      }
    });

    // If caching, cache this promise.
    if (shouldCache) {
      this._promiseCache.set(cacheKey, promise);
    }

    return promise;
  };

  /**
   * Loads multiple keys, promising an array of values:
   *
   *     var [ a, b ] = await myLoader.loadMany([ 'a', 'b' ]);
   *
   * This is equivalent to the more verbose:
   *
   *     var [ a, b ] = await Promise.all([
   *       myLoader.load('a'),
   *       myLoader.load('b')
   *     ]);
   *
   */


  DataLoader.prototype.loadMany = function loadMany(keys) {
    var _this2 = this;

    if (!Array.isArray(keys)) {
      throw new TypeError('The loader.loadMany() function must be called with Array<key> ' + ('but got: ' + keys + '.'));
    }
    return Promise.all(keys.map(function (key) {
      return _this2.load(key);
    }));
  };

  /**
   * Clears the value at `key` from the cache, if it exists. Returns itself for
   * method chaining.
   */


  DataLoader.prototype.clear = function clear(key) {
    var cacheKeyFn = this._options && this._options.cacheKeyFn;
    var cacheKey = cacheKeyFn ? cacheKeyFn(key) : key;
    this._promiseCache.delete(cacheKey);
    return this;
  };

  /**
   * Clears the entire cache. To be used when some event results in unknown
   * invalidations across this particular `DataLoader`. Returns itself for
   * method chaining.
   */


  DataLoader.prototype.clearAll = function clearAll() {
    this._promiseCache.clear();
    return this;
  };

  /**
   * Adds the provided key and value to the cache. If the key already
   * exists, no change is made. Returns itself for method chaining.
   */


  DataLoader.prototype.prime = function prime(key, value) {
    var cacheKeyFn = this._options && this._options.cacheKeyFn;
    var cacheKey = cacheKeyFn ? cacheKeyFn(key) : key;

    // Only add the key if it does not already exist.
    if (this._promiseCache.get(cacheKey) === undefined) {
      // Cache a rejected promise if the value is an Error, in order to match
      // the behavior of load(key).
      var promise = value instanceof Error ? Promise.reject(value) : Promise.resolve(value);

      this._promiseCache.set(cacheKey, promise);
    }

    return this;
  };

  return DataLoader;
}();

// Private: Enqueue a Job to be executed after all "PromiseJobs" Jobs.
//
// ES6 JavaScript uses the concepts Job and JobQueue to schedule work to occur
// after the current execution context has completed:
// http://www.ecma-international.org/ecma-262/6.0/#sec-jobs-and-job-queues
//
// Node.js uses the `process.nextTick` mechanism to implement the concept of a
// Job, maintaining a global FIFO JobQueue for all Jobs, which is flushed after
// the current call stack ends.
//
// When calling `then` on a Promise, it enqueues a Job on a specific
// "PromiseJobs" JobQueue which is flushed in Node as a single Job on the
// global JobQueue.
//
// DataLoader batches all loads which occur in a single frame of execution, but
// should include in the batch all loads which occur during the flushing of the
// "PromiseJobs" JobQueue after that same execution frame.
//
// In order to avoid the DataLoader dispatch Job occuring before "PromiseJobs",
// A Promise Job is created with the sole purpose of enqueuing a global Job,
// ensuring that it always occurs after "PromiseJobs" ends.
//
// Node.js's job queue is unique. Browsers do not have an equivalent mechanism
// for enqueuing a job to be performed after promise microtasks and before the
// next macrotask. For browser environments, a macrotask is used (via
// setImmediate or setTimeout) at a potential performance penalty.


// If a custom cache is provided, it must be of this type (a subset of ES6 Map).

/**
 *  Copyright (c) 2015, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 */

// A Function, which when given an Array of keys, returns a Promise of an Array
// of values or Errors.


var enqueuePostPromiseJob = typeof process === 'object' && typeof process.nextTick === 'function' ? function (fn) {
  if (!resolvedPromise) {
    resolvedPromise = Promise.resolve();
  }
  resolvedPromise.then(function () {
    return process.nextTick(fn);
  });
} : setImmediate || setTimeout;

// Private: cached resolved Promise instance
var resolvedPromise;

// Private: given the current state of a Loader instance, perform a batch load
// from its current queue.
function dispatchQueue(loader) {
  // Take the current loader queue, replacing it with an empty queue.
  var queue = loader._queue;
  loader._queue = [];

  // If a maxBatchSize was provided and the queue is longer, then segment the
  // queue into multiple batches, otherwise treat the queue as a single batch.
  var maxBatchSize = loader._options && loader._options.maxBatchSize;
  if (maxBatchSize && maxBatchSize > 0 && maxBatchSize < queue.length) {
    for (var i = 0; i < queue.length / maxBatchSize; i++) {
      dispatchQueueBatch(loader, queue.slice(i * maxBatchSize, (i + 1) * maxBatchSize));
    }
  } else {
    dispatchQueueBatch(loader, queue);
  }
}

function dispatchQueueBatch(loader, queue) {
  // Collect all keys to be loaded in this dispatch
  var keys = queue.map(function (_ref) {
    var key = _ref.key;
    return key;
  });

  // Call the provided batchLoadFn for this loader with the loader queue's keys.
  var batchLoadFn = loader._batchLoadFn;
  var batchPromise = batchLoadFn(keys);

  // Assert the expected response from batchLoadFn
  if (!batchPromise || typeof batchPromise.then !== 'function') {
    return failedDispatch(loader, queue, new TypeError('DataLoader must be constructed with a function which accepts ' + 'Array<key> and returns Promise<Array<value>>, but the function did ' + ('not return a Promise: ' + String(batchPromise) + '.')));
  }

  // Await the resolution of the call to batchLoadFn.
  batchPromise.then(function (values) {

    // Assert the expected resolution from batchLoadFn.
    if (!Array.isArray(values)) {
      throw new TypeError('DataLoader must be constructed with a function which accepts ' + 'Array<key> and returns Promise<Array<value>>, but the function did ' + ('not return a Promise of an Array: ' + String(values) + '.'));
    }
    if (values.length !== keys.length) {
      throw new TypeError('DataLoader must be constructed with a function which accepts ' + 'Array<key> and returns Promise<Array<value>>, but the function did ' + 'not return a Promise of an Array of the same length as the Array ' + 'of keys.' + ('\n\nKeys:\n' + String(keys)) + ('\n\nValues:\n' + String(values)));
    }

    // Step through the values, resolving or rejecting each Promise in the
    // loaded queue.
    queue.forEach(function (_ref2, index) {
      var resolve = _ref2.resolve,
          reject = _ref2.reject;

      var value = values[index];
      if (value instanceof Error) {
        reject(value);
      } else {
        resolve(value);
      }
    });
  }).catch(function (error) {
    return failedDispatch(loader, queue, error);
  });
}

// Private: do not cache individual loads if the entire batch dispatch fails,
// but still reject each request so they do not hang.
function failedDispatch(loader, queue, error) {
  queue.forEach(function (_ref3) {
    var key = _ref3.key,
        reject = _ref3.reject;

    loader.clear(key);
    reject(error);
  });
}

// Private: given the DataLoader's options, produce a CacheMap to be used.
function getValidCacheMap(options) {
  var cacheMap = options && options.cacheMap;
  if (!cacheMap) {
    return new Map();
  }
  var cacheFunctions = ['get', 'set', 'delete', 'clear'];
  var missingFunctions = cacheFunctions.filter(function (fnName) {
    return cacheMap && typeof cacheMap[fnName] !== 'function';
  });
  if (missingFunctions.length !== 0) {
    throw new TypeError('Custom cacheMap missing methods: ' + missingFunctions.join(', '));
  }
  return cacheMap;
}

// Private


module.exports = DataLoader;