#1665

Committed 21 Feb 2016 06:36PM UTC coverage: 46.0% (-44.9%) from 90.894%

Build # #1665

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push

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Merge pull request #388 from Crossy147/monad-pattern

Monad pattern

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/observer/src/main/java/com/iluwatar/observer/App.java

/**
 * The MIT License
 * Copyright (c) 2014 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.observer;

import com.iluwatar.observer.generic.GHobbits;
import com.iluwatar.observer.generic.GOrcs;
import com.iluwatar.observer.generic.GWeather;

/**
 * 
 * The Observer pattern is a software design pattern in which an object, called the subject,
 * maintains a list of its dependents, called observers, and notifies them automatically of any
 * state changes, usually by calling one of their methods. It is mainly used to implement
 * distributed event handling systems. The Observer pattern is also a key part in the familiar
 * model–view–controller (MVC) architectural pattern. The Observer pattern is implemented in
 * numerous programming libraries and systems, including almost all GUI toolkits.
 * <p>
 * In this example {@link Weather} has a state that can be observed. The {@link Orcs} and
 * {@link Hobbits} register as observers and receive notifications when the {@link Weather} changes.
 * 
 */
public class App {

  /**
   * Program entry point
   * 
   * @param args command line args
   */
  public static void main(String[] args) {

    Weather weather = new Weather();
    weather.addObserver(new Orcs());
    weather.addObserver(new Hobbits());

    weather.timePasses();
    weather.timePasses();
    weather.timePasses();
    weather.timePasses();

    // Generic observer inspired by Java Generics and Collection by Naftalin & Wadler
    System.out.println("\n--Running generic version--");
    GWeather gWeather = new GWeather();
    gWeather.addObserver(new GOrcs());
    gWeather.addObserver(new GHobbits());

    gWeather.timePasses();
    gWeather.timePasses();
    gWeather.timePasses();
    gWeather.timePasses();
  }
}

1	/**
2	* The MIT License
3	* Copyright (c) 2014 Ilkka Seppälä
4	*
5	* Permission is hereby granted, free of charge, to any person obtaining a copy
6	* of this software and associated documentation files (the "Software"), to deal
7	* in the Software without restriction, including without limitation the rights
8	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9	* copies of the Software, and to permit persons to whom the Software is
10	* furnished to do so, subject to the following conditions:
11	*
12	* The above copyright notice and this permission notice shall be included in
13	* all copies or substantial portions of the Software.
14	*
15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21	* THE SOFTWARE.
22	*/
23	package com.iluwatar.observer;
24
25	import com.iluwatar.observer.generic.GHobbits;
26	import com.iluwatar.observer.generic.GOrcs;
27	import com.iluwatar.observer.generic.GWeather;
28
29	/**
30	*
31	* The Observer pattern is a software design pattern in which an object, called the subject,
32	* maintains a list of its dependents, called observers, and notifies them automatically of any
33	* state changes, usually by calling one of their methods. It is mainly used to implement
34	* distributed event handling systems. The Observer pattern is also a key part in the familiar
35	* model–view–controller (MVC) architectural pattern. The Observer pattern is implemented in
36	* numerous programming libraries and systems, including almost all GUI toolkits.
37	* <p>
38	* In this example {@link Weather} has a state that can be observed. The {@link Orcs} and
39	* {@link Hobbits} register as observers and receive notifications when the {@link Weather} changes.
40	*
41	*/
42	public class App {	×
43
44	/**
45	* Program entry point
46	*
47	* @param args command line args
48	*/
49	public static void main(String[] args) {
50
51	Weather weather = new Weather();	×
52	weather.addObserver(new Orcs());	×
53	weather.addObserver(new Hobbits());	×
54
55	weather.timePasses();	×
56	weather.timePasses();	×
57	weather.timePasses();	×
58	weather.timePasses();	×
59
60	// Generic observer inspired by Java Generics and Collection by Naftalin & Wadler
61	System.out.println("\n--Running generic version--");	×
62	GWeather gWeather = new GWeather();	×
63	gWeather.addObserver(new GOrcs());	×
64	gWeather.addObserver(new GHobbits());	×
65
66	gWeather.timePasses();	×
67	gWeather.timePasses();	×
68	gWeather.timePasses();	×
69	gWeather.timePasses();	×
70	}	×
71	}

iluwatar / java-design-patterns / #1665

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