/
WorkerInterface.js
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/
WorkerInterface.js
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/*****************************************************************************
* Open MCT, Copyright (c) 2014-2017, United States Government
* as represented by the Administrator of the National Aeronautics and Space
* Administration. All rights reserved.
*
* Open MCT is 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.
*
* Open MCT includes source code licensed under additional open source
* licenses. See the Open Source Licenses file (LICENSES.md) included with
* this source code distribution or the Licensing information page available
* at runtime from the About dialog for additional information.
*****************************************************************************/
define([
'text!./generatorWorker.js',
'uuid'
], function (
workerText,
uuid
) {
var workerBlob = new Blob(
[workerText],
{type: 'application/javascript'}
);
var workerUrl = URL.createObjectURL(workerBlob);
function WorkerInterface() {
this.worker = new Worker(workerUrl);
this.worker.onmessage = this.onMessage.bind(this);
this.callbacks = {};
}
WorkerInterface.prototype.onMessage = function (message) {
message = message.data;
var callback = this.callbacks[message.id];
if (callback) {
if (callback(message)) {
delete this.callbacks[message.id];
}
}
};
WorkerInterface.prototype.dispatch = function (request, data, callback) {
var message = {
request: request,
data: data,
id: uuid()
};
if (callback) {
this.callbacks[message.id] = callback;
}
this.worker.postMessage(message);
return message.id;
};
WorkerInterface.prototype.request = function (request) {
var deferred = {};
var promise = new Promise(function (resolve, reject) {
deferred.resolve = resolve;
deferred.reject = reject;
});
function callback(message) {
if (message.error) {
deferred.reject(message.error);
} else {
deferred.resolve(message.data);
}
return true;
}
this.dispatch('request', request, callback);
return promise;
};
WorkerInterface.prototype.subscribe = function (request, cb) {
var isCancelled = false;
var callback = function (message) {
if (isCancelled) {
return true;
}
cb(message.data);
};
var messageId = this.dispatch('subscribe', request, callback)
return function () {
isCancelled = true;
this.dispatch('unsubscribe', {
id: messageId
});
}.bind(this);
};
return WorkerInterface;
});