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1 /*
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2 * Dropdown.js
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3 *
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4 * Copyright (c) 2012, Stefan Jänicke. All rights reserved.
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5 *
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6 * This library is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 3 of the License, or (at your option) any later version.
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10 *
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11 * This library is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with this library; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 * MA 02110-1301 USA
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20 */
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21
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22 /**
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23 * @class Publisher
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24 * Publish/Subscribe mechanism
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25 * @author Stefan Jänicke (stjaenicke@informatik.uni-leipzig.de)
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26 * @release 1.0
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27 * @release date: 2012-07-27
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28 * @version date: 2012-07-27
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29 */
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30 if ( typeof Publisher == 'undefined') {
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31
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32 Publisher = function() {
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33
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34 var topics = [];
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35
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36 this.Get = function(topic) {
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37 var value = topics[topic];
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38 if (!value || !(value instanceof Array)) {
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39 value = topics[topic] = [];
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40 }
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41 return value;
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42 };
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43
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44 this.Publish = function(topic, data, publisher) {
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45 var subscribers = this.Get(topic);
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46 for (var i = 0; i < subscribers.length; i++) {
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47 if (publisher == null || subscribers[i].client != publisher) {
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48 subscribers[i].callback(data);
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49 }
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50 }
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51 };
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52
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53 this.Subscribe = function(topic, subscriber, callback) {
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54 var subscribers = this.Get(topic);
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55 subscribers.push({
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56 client : subscriber,
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57 callback : callback
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58 });
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59 };
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60
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61 this.Unsubscribe = function(topic, unsubscriber) {
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62 var subscribers = this.Get(topic);
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63 for (var i = 0; i < subscribers.length; i++) {
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64 if (subscribers[i].client == unsubscriber) {
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65 subscribers.splice(i, 1);
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66 return;
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67 }
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68 }
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69 };
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70
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71 return this;
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72
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73 }();
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74
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75 }
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