workerpool.js

/**
 * workerpool.js
 * https://github.com/josdejong/workerpool
 *
 * Offload tasks to a pool of workers on node.js and in the browser.
 *
 * @version 2.3.0
 * @date    2017-09-30
 *
 * @license
 * Copyright (C) 2014-2016 Jos de Jong <wjosdejong@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy
 * of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

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		exports["workerpool"] = factory();
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		root["workerpool"] = factory();
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/* 0 */
/***/ (function(module, exports, __webpack_require__) {

	var environment = __webpack_require__(1);

	/**
	 * Create a new worker pool
	 * @param {Object} [options]
	 * @returns {Pool} pool
	 */
	exports.pool = function pool(script, options) {
	  var Pool = __webpack_require__(3);

	  return new Pool(script, options);
	};

	/**
	 * Create a worker and optionally register a set of methods to the worker.
	 * @param {Object} [methods]
	 */
	exports.worker = function worker(methods) {
	  var worker = __webpack_require__(9);
	  worker.add(methods);
	};

	/**
	 * Create a promise.
	 * @type {Promise} promise
	 */
	exports.Promise = __webpack_require__(4);

	exports.platform = environment.platform;
	exports.isMainThread = environment.isMainThread;
	exports.cpus = environment.cpus;

/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {

	// used to prevent webpack from resolving requires on node libs
	var node = {require: __webpack_require__(2)};

	// determines the JavaScript platform: browser or node
	module.exports.platform = typeof Window !== 'undefined' || typeof WorkerGlobalScope !== 'undefined' ? 'browser' : 'node';

	// determines whether the code is running in main thread or not
	module.exports.isMainThread = module.exports.platform === 'browser' ? typeof Window !== 'undefined' : !process.connected;

	// determines the number of cpus available
	module.exports.cpus = module.exports.platform === 'browser'
	  ? self.navigator.hardwareConcurrency
	  : node.require('os').cpus().length;  // call node.require to prevent `os` to be required when loading with AMD

/***/ }),
/* 2 */
/***/ (function(module, exports, __webpack_require__) {

	var map = {
		"./Pool": 3,
		"./Pool.js": 3,
		"./Promise": 4,
		"./Promise.js": 4,
		"./WorkerHandler": 5,
		"./WorkerHandler.js": 5,
		"./environment": 1,
		"./environment.js": 1,
		"./generated/embeddedWorker": 7,
		"./generated/embeddedWorker.js": 7,
		"./header": 8,
		"./header.js": 8,
		"./worker": 9,
		"./worker.js": 9
	};
	function webpackContext(req) {
		return __webpack_require__(webpackContextResolve(req));
	};
	function webpackContextResolve(req) {
		return map[req] || (function() { throw new Error("Cannot find module '" + req + "'.") }());
	};
	webpackContext.keys = function webpackContextKeys() {
		return Object.keys(map);
	};
	webpackContext.resolve = webpackContextResolve;
	module.exports = webpackContext;
	webpackContext.id = 2;


/***/ }),
/* 3 */
/***/ (function(module, exports, __webpack_require__) {

	var Promise = __webpack_require__(4);
	var WorkerHandler = __webpack_require__(5);
	var environment = __webpack_require__(1);

	/**
	 * A pool to manage workers
	 * @param {String} [script]   Optional worker script
	 * @param {Object} [options]  Available options: maxWorkers: Number
	 * @constructor
	 */
	function Pool(script, options) {
	  if (typeof script === 'string') {
	    this.script = script || null;
	  }
	  else {
	    this.script = null;
	    options = script;
	  }

	  this.workers = [];  // queue with all workers
	  this.tasks = [];    // queue with tasks awaiting execution

	  options = options || {};

	  this.forkArgs = options.forkArgs || [];
	  this.forkOpts = options.forkOpts || {};
	  this.debugPortStart = options.debugPortStart || 43210;

	  // configuration
	  if (options && 'maxWorkers' in options) {
	    validateMaxWorkers(options.maxWorkers);
	    this.maxWorkers = options.maxWorkers;
	  }
	  else {
	    this.maxWorkers = Math.max((environment.cpus || 4) - 1, 1);
	  }

	  if (options && 'minWorkers' in options) {
	    if(options.minWorkers === 'max') {
	      this.minWorkers = Math.max((environment.cpus || 4) - 1, 1);
	    } else {
	      validateMinWorkers(options.minWorkers);
	      this.minWorkers = options.minWorkers;
	      this.maxWorkers = Math.max(this.minWorkers, this.maxWorkers);     // in case minWorkers is higher than maxWorkers
	    }
	    this._ensureMinWorkers();
	  }
	}

	/**
	 * Execute a function on a worker.
	 *
	 * Example usage:
	 *
	 *   var pool = new Pool()
	 *
	 *   // call a function available on the worker
	 *   pool.exec('fibonacci', [6])
	 *
	 *   // offload a function
	 *   function add(a, b) {
	 *     return a + b
	 *   };
	 *   pool.exec(add, [2, 4])
	 *       .then(function (result) {
	 *         console.log(result); // outputs 6
	 *       })
	 *       .catch(function(error) {
	 *         console.log(error);
	 *       });
	 *
	 * @param {String | Function} method  Function name or function.
	 *                                    If `method` is a string, the corresponding
	 *                                    method on the worker will be executed
	 *                                    If `method` is a Function, the function
	 *                                    will be stringified and executed via the
	 *                                    workers built-in function `run(fn, args)`.
	 * @param {Array} [params]  Function arguments applied when calling the function
	 * @return {Promise.<*, Error>} result
	 */
	Pool.prototype.exec = function (method, params) {
	  // validate type of arguments
	  if (params && !Array.isArray(params)) {
	    throw new TypeError('Array expected as argument "params"');
	  }

	  if (typeof method === 'string') {
	    var resolver = Promise.defer();

	    // add a new task to the queue
	    var tasks = this.tasks;
	    var task = {
	      method:  method,
	      params:  params,
	      resolver: resolver,
	      timeout: null
	    };
	    tasks.push(task);

	    // replace the timeout method of the Promise with our own,
	    // which starts the timer as soon as the task is actually started
	    var originalTimeout = resolver.promise.timeout
	    resolver.promise.timeout = function timeout (delay) {
	      if (tasks.indexOf(task) !== -1) {
	        // task is still queued -> start the timer later on
	        task.timeout = delay;
	        return resolver.promise;
	      }
	      else {
	        // task is already being executed -> start timer immediately
	        return originalTimeout.call(resolver.promise, delay);
	      }
	    }

	    // trigger task execution
	    this._next();

	    return resolver.promise;
	  }
	  else if (typeof method === 'function') {
	    // send stringified function and function arguments to worker
	    return this.exec('run', [String(method), params]);
	  }
	  else {
	    throw new TypeError('Function or string expected as argument "method"');
	  }
	};

	/**
	 * Create a proxy for current worker. Returns an object containing all
	 * methods available on the worker. The methods always return a promise.
	 *
	 * @return {Promise.<Object, Error>} proxy
	 */
	Pool.prototype.proxy = function () {
	  if (arguments.length > 0) {
	    throw new Error('No arguments expected');
	  }

	  var pool = this;
	  return this.exec('methods')
	      .then(function (methods) {
	        var proxy = {};

	        methods.forEach(function (method) {
	          proxy[method] = function () {
	            return pool.exec(method, Array.prototype.slice.call(arguments));
	          }
	        });

	        return proxy;
	      });
	};

	/**
	 * Creates new array with the results of calling a provided callback function
	 * on every element in this array.
	 * @param {Array} array
	 * @param {function} callback  Function taking two arguments:
	 *                             `callback(currentValue, index)`
	 * @return {Promise.<Array>} Returns a promise which resolves  with an Array
	 *                           containing the results of the callback function
	 *                           executed for each of the array elements.
	 */
	/* TODO: implement map
	Pool.prototype.map = function (array, callback) {
	};
	*/

	/**
	 * Grab the first task from the queue, find a free worker, and assign the
	 * worker to the task.
	 * @protected
	 */
	Pool.prototype._next = function () {
	  if (this.tasks.length > 0) {
	    // there are tasks in the queue

	    // find an available worker
	    var worker = this._getWorker();
	    if (worker) {
	      // get the first task from the queue
	      var me = this;
	      var task = this.tasks.shift();

	      // check if the task is still pending (and not cancelled -> promise rejected)
	      if (task.resolver.promise.pending) {
	        // send the request to the worker
	        var promise = worker.exec(task.method, task.params, task.resolver)
	          .then(function () {
	            me._next(); // trigger next task in the queue
	          })
	          .catch(function () {
	            // if the worker crashed and terminated, remove it from the pool
	            if (worker.terminated) {
	              me._removeWorker(worker);
	              // If minWorkers set, spin up new workers to replace the crashed ones
	              me._ensureMinWorkers();
	            }
	            me._next(); // trigger next task in the queue
	          });

	        // start queued timer now
	        if (typeof task.timeout === 'number') {
	          promise.timeout(task.timeout);
	        }
	      }
	    }
	  }
	};

	/**
	 * Get an available worker. If no worker is available and the maximum number
	 * of workers isn't yet reached, a new worker will be created and returned.
	 * If no worker is available and the maximum number of workers is reached,
	 * null will be returned.
	 *
	 * @return {WorkerHandler | null} worker
	 * @private
	 */
	Pool.prototype._getWorker = function() {
	  // find a non-busy worker
	  for (var i = 0, ii = this.workers.length; i < ii; i++) {
	    var worker = this.workers[i];
	    if (!worker.busy()) {
	      return worker;
	    }
	  }

	  if (this.workers.length < this.maxWorkers) {
	    // create a new worker
	    worker = new WorkerHandler(this.script, {
	      forkArgs: this.forkArgs,
	      forkOpts: this.forkOpts,
	      debugPort: this.debugPortStart + this.workers.length
	    });
	    this.workers.push(worker);
	    return worker;
	  }

	  return null;
	};

	/**
	 * Remove a worker from the pool. For example after a worker terminated for
	 * whatever reason
	 * @param {WorkerHandler} worker
	 * @protected
	 */
	Pool.prototype._removeWorker = function(worker) {
	  // terminate the worker (if not already terminated)
	  worker.terminate();
	  this._removeWorkerFromList(worker);
	};

	/**
	 * Remove a worker from the pool list.
	 * @param {WorkerHandler} worker
	 * @protected
	 */
	Pool.prototype._removeWorkerFromList = function(worker) {
	  // remove from the list with workers
	  var index = this.workers.indexOf(worker);
	  if (index != -1) {
	    this.workers.splice(index, 1);
	  }
	};

	/**
	 * Close all active workers. Tasks currently being executed will be finished first.
	 * @param {boolean} [force=false]   If false (default), the workers are terminated
	 *                                  after finishing all tasks currently in
	 *                                  progress. If true, the workers will be
	 *                                  terminated immediately.
	 * @param {number} [timeout]        If provided and non-zero, worker termination promise will be rejected
	 *                                  after timeout if worker process has not been terminated.
	 * @return {Promise.<void, Error>}
	 */
	Pool.prototype.terminate = function (force, timeout) {
	  var f = function (worker) {
	    this._removeWorkerFromList(worker);
	  };
	  var removeWorker = f.bind(this);

	  var promises = [];
	  var workers = this.workers.slice();
	  workers.forEach(function (worker) {
	    var termPromise = worker.terminateAndNotify(force, timeout)
	      .then(removeWorker);
	    promises.push(termPromise);
	  });
	  return Promise.all(promises);
	};

	// DEPRECATED
	/**
	 * Close all active workers. Unlike terminate, this function does not return a promise.
	 * @param force
	 */
	Pool.prototype.clear = function (force) {
	  this.terminate(force);
	};

	/**
	 * Retrieve statistics on tasks and workers.
	 * @return {{totalWorkers: number, busyWorkers: number, idleWorkers: number, pendingTasks: number, activeTasks: number}} Returns an object with statistics
	 */
	Pool.prototype.stats = function () {
	  var totalWorkers = this.workers.length;
	  var busyWorkers = this.workers.filter(function (worker) {
	    return worker.busy();
	  }).length;

	  return {
	    totalWorkers:  totalWorkers,
	    busyWorkers:   busyWorkers,
	    idleWorkers:   totalWorkers - busyWorkers,

	    pendingTasks:  this.tasks.length,
	    activeTasks:   busyWorkers
	  };
	};

	/**
	 * Ensures that a minimum of minWorkers is up and running
	 * @protected
	 */
	Pool.prototype._ensureMinWorkers = function() {
	  if (this.minWorkers) {
	    for(var i = this.workers.length; i < this.minWorkers; i++) {
	      this.workers.push(new WorkerHandler(this.script, {
	        forkArgs: this.forkArgs,
	        forkOpts: this.forkOpts,
	        debugPort: this.debugPortStart + i
	      }));
	    }
	  }
	};

	/**
	 * Ensure that the maxWorkers option is an integer >= 1
	 * @param {*} maxWorkers
	 * @returns {boolean} returns true maxWorkers has a valid value
	 */
	function validateMaxWorkers(maxWorkers) {
	  if (!isNumber(maxWorkers) || !isInteger(maxWorkers) || maxWorkers < 1) {
	    throw new TypeError('Option maxWorkers must be an integer number >= 1');
	  }
	}

	/**
	 * Ensure that the minWorkers option is an integer >= 0
	 * @param {*} minWorkers
	 * @returns {boolean} returns true when minWorkers has a valid value
	 */
	function validateMinWorkers(minWorkers) {
	  if (!isNumber(minWorkers) || !isInteger(minWorkers) || minWorkers < 0) {
	    throw new TypeError('Option minWorkers must be an integer number >= 0');
	  }
	}

	/**
	 * Test whether a variable is a number
	 * @param {*} value
	 * @returns {boolean} returns true when value is a number
	 */
	function isNumber(value) {
	  return typeof value === 'number';
	}

	/**
	 * Test whether a number is an integer
	 * @param {number} value
	 * @returns {boolean} Returns true if value is an integer
	 */
	function isInteger(value) {
	  return Math.round(value) == value;
	}

	module.exports = Pool;


/***/ }),
/* 4 */
/***/ (function(module, exports) {

	'use strict';

	/**
	 * Promise
	 *
	 * Inspired by https://gist.github.com/RubaXa/8501359 from RubaXa <trash@rubaxa.org>
	 *
	 * @param {Function} handler   Called as handler(resolve: Function, reject: Function)
	 * @param {Promise} [parent]   Parent promise for propagation of cancel and timeout
	 */
	function Promise(handler, parent) {
	  var me = this;

	  if (!(this instanceof Promise)) {
	    throw new SyntaxError('Constructor must be called with the new operator');
	  }

	  if (typeof handler !== 'function') {
	    throw new SyntaxError('Function parameter handler(resolve, reject) missing');
	  }

	  var _onSuccess = [];
	  var _onFail = [];

	  // status
	  this.resolved = false;
	  this.rejected = false;
	  this.pending = true;

	  /**
	   * Process onSuccess and onFail callbacks: add them to the queue.
	   * Once the promise is resolve, the function _promise is replace.
	   * @param {Function} onSuccess
	   * @param {Function} onFail
	   * @private
	   */
	  var _process = function (onSuccess, onFail) {
	    _onSuccess.push(onSuccess);
	    _onFail.push(onFail);
	  };

	  /**
	   * Add an onSuccess callback and optionally an onFail callback to the Promise
	   * @param {Function} onSuccess
	   * @param {Function} [onFail]
	   * @returns {Promise} promise
	   */
	  this.then = function (onSuccess, onFail) {
	    return new Promise(function (resolve, reject) {
	      var s = onSuccess ? _then(onSuccess, resolve, reject) : resolve;
	      var f = onFail    ? _then(onFail,    resolve, reject) : reject;

	      _process(s, f);
	    }, me);
	  };

	  /**
	   * Resolve the promise
	   * @param {*} result
	   * @type {Function}
	   */
	  var _resolve = function (result) {
	    // update status
	    me.resolved = true;
	    me.rejected = false;
	    me.pending = false;

	    _onSuccess.forEach(function (fn) {
	      fn(result);
	    });

	    _process = function (onSuccess, onFail) {
	      onSuccess(result);
	    };

	    _resolve = _reject = function () {
	      throw new Error('Promise is already resolved');
	    };

	    return me;
	  };

	  /**
	   * Reject the promise
	   * @param {Error} error
	   * @type {Function}
	   */
	  var _reject = function (error) {
	    // update status
	    me.resolved = false;
	    me.rejected = true;
	    me.pending = false;

	    _onFail.forEach(function (fn) {
	      fn(error);
	    });

	    _process = function (onSuccess, onFail) {
	      onFail(error);
	    };

	    _resolve = _reject = function () {
	      throw new Error('Promise is already resolved');
	    };

	    return me;
	  };

	  /**
	   * Cancel te promise. This will reject the promise with a CancellationError
	   * @returns {Promise} self
	   */
	  this.cancel = function () {
	    if (parent) {
	      parent.cancel();
	    }
	    else {
	      _reject(new CancellationError());
	    }

	    return me;
	  };

	  /**
	   * Set a timeout for the promise. If the promise is not resolved within
	   * the time, the promise will be cancelled and a TimeoutError is thrown.
	   * If the promise is resolved in time, the timeout is removed.
	   * @param {number} delay     Delay in milliseconds
	   * @returns {Promise} self
	   */
	  this.timeout = function (delay) {
	    if (parent) {
	      parent.timeout(delay);
	    }
	    else {
	      var timer = setTimeout(function () {
	        _reject(new TimeoutError('Promise timed out after ' + delay + ' ms'));
	      }, delay);

	      me.always(function () {
	        clearTimeout(timer);
	      });
	    }

	    return me;
	  };

	  // attach handler passing the resolve and reject functions
	  handler(function (result) {
	    _resolve(result);
	  }, function (error) {
	    _reject(error);
	  });
	}

	/**
	 * Execute given callback, then call resolve/reject based on the returned result
	 * @param {Function} callback
	 * @param {Function} resolve
	 * @param {Function} reject
	 * @returns {Function}
	 * @private
	 */
	function _then(callback, resolve, reject) {
	  return function (result) {
	    try {
	      var res = callback(result);
	      if (res && typeof res.then === 'function' && typeof res['catch'] === 'function') {
	        // method returned a promise
	        res.then(resolve, reject);
	      }
	      else {
	        resolve(res);
	      }
	    }
	    catch (error) {
	      reject(error);
	    }
	  }
	}

	/**
	 * Add an onFail callback to the Promise
	 * @param {Function} onFail
	 * @returns {Promise} promise
	 */
	Promise.prototype['catch'] = function (onFail) {
	  return this.then(null, onFail);
	};

	// TODO: add support for Promise.catch(Error, callback)
	// TODO: add support for Promise.catch(Error, Error, callback)

	/**
	 * Execute given callback when the promise either resolves or rejects.
	 * @param {Function} fn
	 * @returns {Promise} promise
	 */
	Promise.prototype.always = function (fn) {
	  return this.then(fn, fn);
	};

	/**
	 * Create a promise which resolves when all provided promises are resolved,
	 * and fails when any of the promises resolves.
	 * @param {Promise[]} promises
	 * @returns {Promise} promise
	 */
	Promise.all = function (promises){
	  return new Promise(function (resolve, reject) {
	    var remaining = promises.length,
	        results = [];

	    if (remaining) {
	      promises.forEach(function (p, i) {
	        p.then(function (result) {
	          results[i] = result;
	          remaining--;
	          if (remaining == 0) {
	            resolve(results);
	          }
	        }, function (error) {
	          remaining = 0;
	          reject(error);
	        });
	      });
	    }
	    else {
	      resolve(results);
	    }
	  });
	};

	/**
	 * Create a promise resolver
	 * @returns {{promise: Promise, resolve: Function, reject: Function}} resolver
	 */
	Promise.defer = function () {
	  var resolver = {};

	  resolver.promise = new Promise(function (resolve, reject) {
	    resolver.resolve = resolve;
	    resolver.reject = reject;
	  });

	  return resolver;
	};

	/**
	 * Create a cancellation error
	 * @param {String} [message]
	 * @extends Error
	 */
	function CancellationError(message) {
	  this.message = message || 'promise cancelled';
	  this.stack = (new Error()).stack;
	}

	CancellationError.prototype = new Error();
	CancellationError.prototype.constructor = Error;
	CancellationError.prototype.name = 'CancellationError';

	Promise.CancellationError = CancellationError;


	/**
	 * Create a timeout error
	 * @param {String} [message]
	 * @extends Error
	 */
	function TimeoutError(message) {
	  this.message = message || 'timeout exceeded';
	  this.stack = (new Error()).stack;
	}

	TimeoutError.prototype = new Error();
	TimeoutError.prototype.constructor = Error;
	TimeoutError.prototype.name = 'TimeoutError';

	Promise.TimeoutError = TimeoutError;


	module.exports = Promise;


/***/ }),
/* 5 */
/***/ (function(module, exports, __webpack_require__) {

	var Promise = __webpack_require__(4);
	var assign = __webpack_require__(6);

	// determine environment
	var environment = __webpack_require__(1);

	// used to prevent webpack from resolving requires on node libs
	var node = {require: __webpack_require__(2)};

	// get the default worker script
	function getDefaultWorker() {
	  if (environment.platform == 'browser') {
	    // test whether the browser supports all features that we need
	    if (typeof Blob === 'undefined') {
	      throw new Error('Blob not supported by the browser');
	    }
	    if (!window.URL || typeof window.URL.createObjectURL !== 'function') {
	      throw new Error('URL.createObjectURL not supported by the browser');
	    }

	    // use embedded worker.js
	    var blob = new Blob([__webpack_require__(7)], {type: 'text/javascript'});
	    return window.URL.createObjectURL(blob);
	  }
	  else {
	    // use external worker.js in current directory
	    return __dirname + '/worker.js';
	  }
	}

	// add debug flags to child processes if the node inspector is active
	function resolveForkOptions(opts) {
	  opts = opts || {};

	  var processExecArgv = process.execArgv.join(' ');
	  var inspectorActive = processExecArgv.indexOf('--inspect') !== -1;
	  var debugBrk = processExecArgv.indexOf('--debug-brk') !== -1;

	  var execArgv = [];
	  if (inspectorActive) {
	    execArgv.push('--inspect=' + opts.debugPort);

	    if (debugBrk) {
	      execArgv.push('--debug-brk');
	    }
	  }

	  return assign({}, opts, {
	    forkArgs: opts.forkArgs,
	    forkOpts: assign({}, opts.forkOpts, {
	      execArgv: (opts.forkOpts && opts.forkOpts.execArgv || [])
	        .concat(execArgv)
	    })
	  });
	}

	/**
	 * Converts a serialized error to Error
	 * @param {Object} obj Error that has been serialized and parsed to object
	 * @return {Error} The equivalent Error.
	 */
	function objectToError (obj) {
	  var temp = new Error('')
	  var props = Object.keys(obj)

	  for (var i = 0; i < props.length; i++) {
	    temp[props[i]] = obj[props[i]]
	  }

	  return temp
	}

	/**
	 * A WorkerHandler controls a single worker. This worker can be a child process
	 * on node.js or a WebWorker in a browser environment.
	 * @param {String} [script] If no script is provided, a default worker with a
	 *                          function run will be created.
	 * @constructor
	 */
	function WorkerHandler(script, options) {
	  this.script = script || getDefaultWorker();

	  var forkOptions;

	  if (environment.platform == 'browser') {
	    // check whether Worker is supported by the browser
	    // Workaround for a bug in PhantomJS (Or QtWebkit): https://github.com/ariya/phantomjs/issues/14534
	    if (typeof Worker !== 'function' && (typeof Worker !== 'object' || typeof Worker.prototype.constructor !== 'function')) {
	      throw new Error('Web workers not supported by the browser');
	    }

	    // create the web worker
	    this.worker = new Worker(this.script);

	    // add node.js API to the web worker
	    this.worker.on = function (event, callback) {
	      this.addEventListener(event, function (message) {
	        callback(message.data);
	      });
	    };
	    this.worker.send = function (message) {
	      this.postMessage(message);
	    };
	  }
	  else {
	    // on node.js, create a child process
	    forkOptions = resolveForkOptions(options);

	    // call node.require to prevent child_process to be required when loading with AMD
	    this.worker = node.require('child_process').fork(
	      this.script,
	      forkOptions.forkArgs,
	      forkOptions.forkOpts
	    );
	  }

	  var me = this;

	  // The ready message is only sent if the worker.add method is called (And the default script is not used)
	  if (!script) {
	    this.worker.ready = true;
	  }

	  // queue for requests that are received before the worker is ready
	  this.requestQueue = [];
	  this.worker.on('message', function (response) {
	    if (typeof response === 'string' && response === 'ready') {
	      me.worker.ready = true;
	      dispatchQueuedRequests();
	    } else {
	      // find the task from the processing queue, and run the tasks callback
	      var id = response.id;
	      var task = me.processing[id];
	      if (task) {
	        // remove the task from the queue
	        delete me.processing[id];

	        // test if we need to terminate
	        if (me.terminating) {
	          // complete worker termination if all tasks are finished
	          me.terminate();
	        }

	        // resolve the task's promise
	        if (response.error) {
	          task.resolver.reject(objectToError(response.error));
	        }
	        else {
	          task.resolver.resolve(response.result);
	        }
	      }
	    }
	  });

	  // reject all running tasks on worker error
	  function onError(error) {
	    me.terminated = true;
	    if (me.terminating && me.terminationHandler) {
	      me.terminationHandler(me);
	    }
	    me.terminating = false;

	    for (var id in me.processing) {
	      if (me.processing.hasOwnProperty(id)) {
	        me.processing[id].resolver.reject(error);
	      }
	    }
	    me.processing = {};
	  }

	  // send all queued requests to worker
	  function dispatchQueuedRequests()
	  {
	    me.requestQueue.forEach(me.worker.send.bind(me.worker));
	    me.requestQueue = [];
	  }

	  // listen for worker messages error and exit
	  this.worker.on('error', onError);
	  this.worker.on('exit', function () {
	    var error = new Error('Worker terminated unexpectedly');
	    onError(error);
	  });

	  this.processing = {}; // queue with tasks currently in progress

	  this.terminating = false;
	  this.terminated = false;
	  this.terminationHandler = null;
	  this.lastId = 0;
	}

	/**
	 * Get a list with methods available on the worker.
	 * @return {Promise.<String[], Error>} methods
	 */
	WorkerHandler.prototype.methods = function () {
	  return this.exec('methods');
	};

	/**
	 * Execute a method with given parameters on the worker
	 * @param {String} method
	 * @param {Array} [params]
	 * @param {{resolve: Function, reject: Function}} [resolver]
	 * @return {Promise.<*, Error>} result
	 */
	WorkerHandler.prototype.exec = function(method, params, resolver) {
	  if (!resolver) {
	    resolver = Promise.defer();
	  }

	  // generate a unique id for the task
	  var id = ++this.lastId;

	  // register a new task as being in progress
	  this.processing[id] = {
	    id: id,
	    resolver: resolver
	  };

	  // build a JSON-RPC request
	  var request = {
	    id: id,
	    method: method,
	    params: params
	  };

	  if (this.terminated) {
	    resolver.reject(new Error('Worker is terminated'));
	  } else if (this.worker.ready) {
	    // send the request to the worker
	    this.worker.send(request);
	  } else {
	    this.requestQueue.push(request);
	  }

	  // on cancellation, force the worker to terminate
	  var me = this;
	  resolver.promise
	      .catch(function (error) {
	        if (error instanceof Promise.CancellationError || error instanceof Promise.TimeoutError) {
	          // remove this task from the queue. It is already rejected (hence this
	          // catch event), and else it will be rejected again when terminating
	          delete me.processing[id];

	          // terminate worker
	          me.terminate(true);
	        }
	      });

	  return resolver.promise;
	};

	/**
	 * Test whether the worker is working or not
	 * @return {boolean} Returns true if the worker is busy
	 */
	WorkerHandler.prototype.busy = function () {
	  return Object.keys(this.processing).length > 0;
	};

	/**
	 * Terminate the worker.
	 * @param {boolean} [force=false]   If false (default), the worker is terminated
	 *                                  after finishing all tasks currently in
	 *                                  progress. If true, the worker will be
	 *                                  terminated immediately.
	 * @param {function} [callback=null] If provided, will be called when process terminates.
	 */
	WorkerHandler.prototype.terminate = function (force, callback) {
	  if (force) {
	    // cancel all tasks in progress
	    for (var id in this.processing) {
	      if (this.processing.hasOwnProperty(id)) {
	        this.processing[id].resolver.reject(new Error('Worker terminated'));
	      }
	    }
	    this.processing = {};
	  }

	  if (typeof callback === 'function') {
	    this.terminationHandler = callback;
	  }
	  if (!this.busy()) {
	    // all tasks are finished. kill the worker
	    if (this.worker) {
	      if (typeof this.worker.kill === 'function') {
	        this.worker.kill();  // child process
	      }
	      else if (typeof this.worker.terminate === 'function') {
	        this.worker.terminate(); // web worker
	      }
	      else {
	        throw new Error('Failed to terminate worker');
	      }
	      this.worker = null;
	    }
	    this.terminating = false;
	    this.terminated = true;
	    if (this.terminationHandler) {
	      this.terminationHandler(this);
	    }
	  }
	  else {
	    // we can't terminate immediately, there are still tasks being executed
	    this.terminating = true;
	  }
	};

	/**
	 * Terminate the worker, returning a Promise that resolves when the termination has been done.
	 * @param {boolean} [force=false]   If false (default), the worker is terminated
	 *                                  after finishing all tasks currently in
	 *                                  progress. If true, the worker will be
	 *                                  terminated immediately.
	 * @param {number} [timeout]        If provided and non-zero, worker termination promise will be rejected
	 *                                  after timeout if worker process has not been terminated.
	 * @return {Promise.<WorkerHandler, Error>}
	 */
	WorkerHandler.prototype.terminateAndNotify = function (force, timeout) {
	  var resolver = Promise.defer();
	  if (timeout) {
	    resolver.promise.timeout = timeout;
	  }
	  this.terminate(force, function(worker) {
	    resolver.resolve(worker);
	  });
	  return resolver.promise;
	};

	module.exports = WorkerHandler;


/***/ }),
/* 6 */
/***/ (function(module, exports) {

	/*
	object-assign
	(c) Sindre Sorhus
	@license MIT
	*/

	'use strict';
	/* eslint-disable no-unused-vars */
	var getOwnPropertySymbols = Object.getOwnPropertySymbols;
	var hasOwnProperty = Object.prototype.hasOwnProperty;
	var propIsEnumerable = Object.prototype.propertyIsEnumerable;

	function toObject(val) {
		if (val === null || val === undefined) {
			throw new TypeError('Object.assign cannot be called with null or undefined');
		}

		return Object(val);
	}

	function shouldUseNative() {
		try {
			if (!Object.assign) {
				return false;
			}

			// Detect buggy property enumeration order in older V8 versions.

			// https://bugs.chromium.org/p/v8/issues/detail?id=4118
			var test1 = new String('abc');  // eslint-disable-line no-new-wrappers
			test1[5] = 'de';
			if (Object.getOwnPropertyNames(test1)[0] === '5') {
				return false;
			}

			// https://bugs.chromium.org/p/v8/issues/detail?id=3056
			var test2 = {};
			for (var i = 0; i < 10; i++) {
				test2['_' + String.fromCharCode(i)] = i;
			}
			var order2 = Object.getOwnPropertyNames(test2).map(function (n) {
				return test2[n];
			});
			if (order2.join('') !== '0123456789') {
				return false;
			}

			// https://bugs.chromium.org/p/v8/issues/detail?id=3056
			var test3 = {};
			'abcdefghijklmnopqrst'.split('').forEach(function (letter) {
				test3[letter] = letter;
			});
			if (Object.keys(Object.assign({}, test3)).join('') !==
					'abcdefghijklmnopqrst') {
				return false;
			}

			return true;
		} catch (err) {
			// We don't expect any of the above to throw, but better to be safe.
			return false;
		}
	}

	module.exports = shouldUseNative() ? Object.assign : function (target, source) {
		var from;
		var to = toObject(target);
		var symbols;

		for (var s = 1; s < arguments.length; s++) {
			from = Object(arguments[s]);

			for (var key in from) {
				if (hasOwnProperty.call(from, key)) {
					to[key] = from[key];
				}
			}

			if (getOwnPropertySymbols) {
				symbols = getOwnPropertySymbols(from);
				for (var i = 0; i < symbols.length; i++) {
					if (propIsEnumerable.call(from, symbols[i])) {
						to[symbols[i]] = from[symbols[i]];
					}
				}
			}
		}

		return to;
	};


/***/ }),
/* 7 */
/***/ (function(module, exports) {

	/**
	 * embeddedWorker.js contains an embedded version of worker.js.
	 * This file is automatically generated,
	 * changes made in this file will be overwritten.
	 */
	module.exports = "!function(r){function e(n){if(o[n])return o[n].exports;var t=o[n]={exports:{},id:n,loaded:!1};return r[n].call(t.exports,t,t.exports,e),t.loaded=!0,t.exports}var o={};e.m=r,e.c=o,e.p=\"\",e(0)}([function(module,exports,__webpack_require__){function convertError(r){return Object.getOwnPropertyNames(r).reduce(function(e,o){return Object.defineProperty(e,o,{value:r[o],enumerable:!0})},{})}function isPromise(r){return r&&\"function\"==typeof r.then&&\"function\"==typeof r.catch}var worker={};if(\"undefined\"!=typeof self&&\"function\"==typeof postMessage&&\"function\"==typeof addEventListener)worker.on=function(r,e){addEventListener(r,function(r){e(r.data)})},worker.send=function(r){postMessage(r)};else{if(\"undefined\"==typeof process)throw new Error(\"Script must be executed as a worker\");worker.on=process.on.bind(process),worker.send=process.send.bind(process)}worker.methods={},worker.methods.run=function run(fn,args){var f=eval(\"(\"+fn+\")\");return f.apply(f,args)},worker.methods.methods=function(){return Object.keys(worker.methods)},worker.on(\"message\",function(r){try{var e=worker.methods[r.method];if(!e)throw new Error('Unknown method \"'+r.method+'\"');var o=e.apply(e,r.params);isPromise(o)?o.then(function(e){worker.send({id:r.id,result:e,error:null})}).catch(function(e){worker.send({id:r.id,result:null,error:convertError(e)})}):worker.send({id:r.id,result:o,error:null})}catch(e){worker.send({id:r.id,result:null,error:convertError(e)})}}),worker.register=function(r){if(r)for(var e in r)r.hasOwnProperty(e)&&(worker.methods[e]=r[e]);worker.send(\"ready\")},exports.add=worker.register}]);";


/***/ }),
/* 8 */
/***/ (function(module, exports) {

	/**
	 * workerpool.js
	 * https://github.com/josdejong/workerpool
	 *
	 * Offload tasks to a pool of workers on node.js and in the browser.
	 *
	 * @version @@version
	 * @date    @@date
	 *
	 * @license
	 * Copyright (C) 2014-2016 Jos de Jong <wjosdejong@gmail.com>
	 *
	 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
	 * use this file except in compliance with the License. You may obtain a copy
	 * of the License at
	 *
	 * http://www.apache.org/licenses/LICENSE-2.0
	 *
	 * Unless required by applicable law or agreed to in writing, software
	 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
	 * License for the specific language governing permissions and limitations under
	 * the License.
	 */


/***/ }),
/* 9 */
/***/ (function(module, exports, __webpack_require__) {

	/**
	 * worker must be started as a child process or a web worker.
	 * It listens for RPC messages from the parent process.
	 */

	// create a worker API for sending and receiving messages which works both on
	// node.js and in the browser
	var worker = {};
	if (typeof self !== 'undefined' && typeof postMessage === 'function' && typeof addEventListener === 'function') {
	  // worker in the browser
	  worker.on = function (event, callback) {
	    addEventListener(event, function (message) {
	      callback(message.data);
	    })
	  };
	  worker.send = function (message) {
	    postMessage(message);
	  };
	}
	else if (typeof process !== 'undefined') {
	  // node.js
	  worker.on = process.on.bind(process);
	  worker.send = process.send.bind(process);
	}
	else {
	  throw new Error('Script must be executed as a worker');
	}

	function convertError(error) {
	  return Object.getOwnPropertyNames(error).reduce(function(product, name) {
	    return Object.defineProperty(product, name, {
		value: error[name],
		enumerable: true
	    });
	  }, {});
	}

	/**
	 * Test whether a value is a Promise via duck typing.
	 * @param {*} value
	 * @returns {boolean} Returns true when given value is an object
	 *                    having functions `then` and `catch`.
	 */
	function isPromise(value) {
	  return value && (typeof value.then === 'function') && (typeof value.catch === 'function');
	}

	// functions available externally
	worker.methods = {};

	/**
	 * Execute a function with provided arguments
	 * @param {String} fn     Stringified function
	 * @param {Array} [args]  Function arguments
	 * @returns {*}
	 */
	worker.methods.run = function run(fn, args) {
	  var f = eval('(' + fn + ')');
	  return f.apply(f, args);
	};

	/**
	 * Get a list with methods available on this worker
	 * @return {String[]} methods
	 */
	worker.methods.methods = function methods() {
	  return Object.keys(worker.methods);
	};

	worker.on('message', function (request) {
	  try {
	    var method = worker.methods[request.method];

	    if (method) {
	      // execute the function
	      var result = method.apply(method, request.params);

	      if (isPromise(result)) {
	        // promise returned, resolve this and then return
	        result
	            .then(function (result) {
	              worker.send({
	                id: request.id,
	                result: result,
	                error: null
	              });
	            })
	            .catch(function (err) {
	              worker.send({
	                id: request.id,
	                result: null,
	                error: convertError(err)
	              });
	            });
	      }
	      else {
	        // immediate result
	        worker.send({
	          id: request.id,
	          result: result,
	          error: null
	        });
	      }
	    }
	    else {
	      throw new Error('Unknown method "' + request.method + '"');
	    }
	  }
	  catch (err) {
	    worker.send({
	      id: request.id,
	      result: null,
	      error: convertError(err)
	    });
	  }
	});

	/**
	 * Register methods to the worker
	 * @param {Object} methods
	 */
	worker.register = function (methods) {

	  if (methods) {
	    for (var name in methods) {
	      if (methods.hasOwnProperty(name)) {
	        worker.methods[name] = methods[name];
	      }
	    }
	  }

	  worker.send('ready');

	};

	if (true) {
	  exports.add = worker.register;
	}


/***/ })
/******/ ])
});
;