\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u884c\u52d5\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u3064\u3067\u3059\u3002\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u306b\u8208\u5473\u304c\u3042\u308a\u3001\u5909\u66f4\u304c\u3042\u308b\u305f\u3073\u306b\u901a\u77e5\u3092\u53d7\u3051\u53d6\u308a\u305f\u3044\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u3067\u306f\u3001\u4ed6\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u3092\u76e3\u8996\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u3068\u547c\u3073\u3001\u76e3\u8996\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30b5\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n
GoF\u306b\u3088\u308c\u3070\u3001\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u610f\u56f3\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n
\uff11\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u304a\u3051\u308b\u4e00\u5bfe\u591a\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3057\u3001\u3042\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u304c\u5909\u66f4\u3055\u308c\u308b\u3068\u3001\u305d\u306e\u4f9d\u5b58\u3059\u308b\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u901a\u77e5\u3055\u308c\u3001\u81ea\u52d5\u7684\u306b\u66f4\u65b0\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p><\/blockquote>\n
\u4e3b\u984c\u306f\u3001\u305d\u306e\u72b6\u614b\u306e\u5909\u5316\u3092\u901a\u77e5\u3059\u308b\u305f\u3081\u306e\u89b3\u5bdf\u8005\u306e\u30ea\u30b9\u30c8\u3092\u542b\u3093\u3067\u3044\u308b\u305f\u3081\u3001\u89b3\u5bdf\u8005\u304c\u81ea\u5206\u81ea\u8eab\u3092\u767b\u9332\u304a\u3088\u3073\u767b\u9332\u89e3\u9664\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4e3b\u984c\u306b\u306f\u307e\u305f\u3001\u5909\u66f4\u306e\u901a\u77e5\u3092\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u306b\u9001\u4fe1\u3057\u306a\u304c\u3089\u66f4\u65b0\u3092\u63d0\u4f9b\u3059\u308b\u304b\u3001\u307e\u305f\u306f\u66f4\u65b0\u3092\u53d6\u5f97\u3059\u308b\u5225\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3082\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002Java\u306f\u3001java.util.Observable\u30af\u30e9\u30b9\u3068java.util.Observer\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u901a\u3058\u3066Observer\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306e\u7d44\u307f\u8fbc\u307f\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5b9f\u88c5\u304c\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u306a\u305f\u3081\u3001\u591a\u304f\u306e\u5834\u5408\u3001Java\u3067\u306f\u30af\u30e9\u30b9\u306e\u62e1\u5f35\u306e\u305f\u3081\u3060\u3051\u306bObserver\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3057\u305f\u304f\u3042\u308a\u307e\u305b\u3093\u3002Java Message Service\uff08JMS\uff09\u3067\u306f\u3001Observer\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3068Mediator\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u4ed6\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u30c7\u30fc\u30bf\u3092\u8cfc\u8aad\u304a\u3088\u3073\u516c\u958b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Model-View-Controller\uff08MVC\uff09\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u306f\u3001\u30e2\u30c7\u30eb\u304c\u4e3b\u984c\u3067\u3042\u308a\u3001\u30d3\u30e5\u30fc\u304c\u30e2\u30c7\u30eb\u306e\u5909\u66f4\u306b\u901a\u77e5\u3055\u308c\u308b\u305f\u3081\u306b\u767b\u9332\u3067\u304d\u308b\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u3067\u3059\u3002<\/p>\n
\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u306eJava\u306e\u4f8b\u3092\u793a\u3059\u3002<\/h3>\n
\u79c1\u305f\u3061\u306e\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u306eJava\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4f8b\u3067\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u30c8\u30d4\u30c3\u30af\u3092\u5b9f\u88c5\u3057\u3001\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u306f\u3053\u306e\u30c8\u30d4\u30c3\u30af\u306b\u767b\u9332\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30c8\u30d4\u30c3\u30af\u306b\u65b0\u3057\u3044\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u6295\u7a3f\u3055\u308c\u308b\u305f\u3073\u306b\u3001\u767b\u9332\u3055\u308c\u305f\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u5168\u54e1\u306b\u901a\u77e5\u3055\u308c\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Subject\u306e\u8981\u4ef6\u306b\u57fa\u3065\u3044\u3066\u3001\u5177\u4f53\u7684\u306aSubject\u304c\u5b9f\u88c5\u3059\u308b\u5951\u7d04\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u57fa\u672c\u7684\u306aSubject\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
package com.scdev.design.observer;\r\n\r\npublic interface Subject {\r\n\r\n\t\/\/methods to register and unregister observers\r\n\tpublic void register(Observer obj);\r\n\tpublic void unregister(Observer obj);\r\n\t\r\n\t\/\/method to notify observers of change\r\n\tpublic void notifyObservers();\r\n\t\r\n\t\/\/method to get updates from subject\r\n\tpublic Object getUpdate(Observer obj);\r\n\t\r\n}\r\n<\/code><\/pre>\n\u6b21\u306b\u3001\u79c1\u305f\u3061\u306f\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u306e\u305f\u3081\u306e\u5951\u7d04\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u306b\u30b5\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30a2\u30bf\u30c3\u30c1\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3001\u30b5\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5909\u66f4\u3092\u901a\u77e5\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u5225\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
package com.scdev.design.observer;\r\n\r\npublic interface Observer {\r\n\t\r\n\t\/\/method to update the observer, used by subject\r\n\tpublic void update();\r\n\t\r\n\t\/\/attach with subject to observe\r\n\tpublic void setSubject(Subject sub);\r\n}\r\n<\/code><\/pre>\n\u4eca\u3084\u5951\u7d04\u306f\u5b8c\u4e86\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u5177\u4f53\u7684\u306a\u5b9f\u65bd\u306b\u9032\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
package com.scdev.design.observer;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class MyTopic implements Subject {\r\n\r\n\tprivate List<Observer> observers;\r\n\tprivate String message;\r\n\tprivate boolean changed;\r\n\tprivate final Object MUTEX= new Object();\r\n\t\r\n\tpublic MyTopic(){\r\n\t\tthis.observers=new ArrayList<>();\r\n\t}\r\n\t@Override\r\n\tpublic void register(Observer obj) {\r\n\t\tif(obj == null) throw new NullPointerException(\"Null Observer\");\r\n\t\tsynchronized (MUTEX) {\r\n\t\tif(!observers.contains(obj)) observers.add(obj);\r\n\t\t}\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void unregister(Observer obj) {\r\n\t\tsynchronized (MUTEX) {\r\n\t\tobservers.remove(obj);\r\n\t\t}\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void notifyObservers() {\r\n\t\tList<Observer> observersLocal = null;\r\n\t\t\/\/synchronization is used to make sure any observer registered after message is received is not notified\r\n\t\tsynchronized (MUTEX) {\r\n\t\t\tif (!changed)\r\n\t\t\t\treturn;\r\n\t\t\tobserversLocal = new ArrayList<>(this.observers);\r\n\t\t\tthis.changed=false;\r\n\t\t}\r\n\t\tfor (Observer obj : observersLocal) {\r\n\t\t\tobj.update();\r\n\t\t}\r\n\r\n\t}\r\n\r\n\t@Override\r\n\tpublic Object getUpdate(Observer obj) {\r\n\t\treturn this.message;\r\n\t}\r\n\t\r\n\t\/\/method to post message to the topic\r\n\tpublic void postMessage(String msg){\r\n\t\tSystem.out.println(\"Message Posted to Topic:\"+msg);\r\n\t\tthis.message=msg;\r\n\t\tthis.changed=true;\r\n\t\tnotifyObservers();\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u89b3\u5bdf\u8005\u3092\u767b\u9332\u304a\u3088\u3073\u89e3\u9664\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u306e\u5b9f\u88c5\u306f\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304cString\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30c8\u30d4\u30c3\u30af\u306b\u6295\u7a3f\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u8ffd\u52a0\u306epostMessage()\u30e1\u30bd\u30c3\u30c9\u3082\u3042\u308a\u307e\u3059\u3002\u30c8\u30d4\u30c3\u30af\u306e\u72b6\u614b\u306e\u5909\u5316\u3092\u8ffd\u8de1\u3059\u308b\u305f\u3081\u306e\u30d6\u30fc\u30eb\u5909\u6570\u306b\u3082\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u5909\u6570\u306f\u5fc5\u8981\u3067\u3059\u3002\u66f4\u65b0\u304c\u306a\u3044\u5834\u5408\u306bnotifyObservers()\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u305f\u5834\u5408\u3001\u89b3\u5bdf\u8005\u306b\u8aa4\u3063\u305f\u901a\u77e5\u304c\u9001\u3089\u308c\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3067\u3059\u3002\u307e\u305f\u3001notifyObservers()\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u540c\u671f\u306e\u4f7f\u7528\u306b\u3082\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30c8\u30d4\u30c3\u30af\u306b\u516c\u958b\u3055\u308c\u308b\u524d\u306b\u767b\u9332\u3055\u308c\u305f\u89b3\u5bdf\u8005\u306b\u306e\u307f\u901a\u77e5\u304c\u9001\u4fe1\u3055\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u30b5\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u76e3\u8996\u3059\u308b\u305f\u3081\u306eObserver\u306e\u5b9f\u88c5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
package com.scdev.design.observer;\r\n\r\npublic class MyTopicSubscriber implements Observer {\r\n\t\r\n\tprivate String name;\r\n\tprivate Subject topic;\r\n\t\r\n\tpublic MyTopicSubscriber(String nm){\r\n\t\tthis.name=nm;\r\n\t}\r\n\t@Override\r\n\tpublic void update() {\r\n\t\tString msg = (String) topic.getUpdate(this);\r\n\t\tif(msg == null){\r\n\t\t\tSystem.out.println(name+\":: No new message\");\r\n\t\t}else\r\n\t\tSystem.out.println(name+\":: Consuming message::\"+msg);\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void setSubject(Subject sub) {\r\n\t\tthis.topic=sub;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\nupdate\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001Subject\u306egetUpdate\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d6\u5f97\u3057\u3001\u6d88\u8cbb\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u547c\u3073\u51fa\u3057\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306b\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u5f15\u6570\u3068\u3057\u3066update\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u306b\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u79c1\u305f\u3061\u306e\u30c8\u30d4\u30c3\u30af\u306e\u5b9f\u88c5\u3092\u6d88\u8cbb\u3059\u308b\u305f\u3081\u306e\u7c21\u5358\u306a\u30c6\u30b9\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.design.observer;\r\n\r\npublic class ObserverPatternTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/create subject\r\n\t\tMyTopic topic = new MyTopic();\r\n\t\t\r\n\t\t\/\/create observers\r\n\t\tObserver obj1 = new MyTopicSubscriber(\"Obj1\");\r\n\t\tObserver obj2 = new MyTopicSubscriber(\"Obj2\");\r\n\t\tObserver obj3 = new MyTopicSubscriber(\"Obj3\");\r\n\t\t\r\n\t\t\/\/register observers to the subject\r\n\t\ttopic.register(obj1);\r\n\t\ttopic.register(obj2);\r\n\t\ttopic.register(obj3);\r\n\t\t\r\n\t\t\/\/attach observer to subject\r\n\t\tobj1.setSubject(topic);\r\n\t\tobj2.setSubject(topic);\r\n\t\tobj3.setSubject(topic);\r\n\t\t\r\n\t\t\/\/check if any update is available\r\n\t\tobj1.update();\r\n\t\t\r\n\t\t\/\/now send message to subject\r\n\t\ttopic.postMessage(\"New Message\");\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u51fa\u529b\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n
Obj1:: No new message\r\nMessage Posted to Topic:New Message\r\nObj1:: Consuming message::New Message\r\nObj2:: Consuming message::New Message\r\nObj3:: Consuming message::New Message\r\n<\/code><\/pre>\nJava\u306e\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30d1\u30bf\u30fc\u30f3\u306e\u30af\u30e9\u30b9\u56f3<\/h3>\n
\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30d1\u30d6\u30ea\u30c3\u30b7\u30e5-\u30b5\u30d6\u30b9\u30af\u30e9\u30a4\u30d6\u30d1\u30bf\u30fc\u30f3\u3068\u3082\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002\u3044\u304f\u3064\u304b\u306e\u5b9f\u88c5\u4f8b\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
\n
- java.util.EventListener in Swing<\/li>\n
- javax.servlet.http.HttpSessionBindingListener<\/li>\n
- javax.servlet.http.HttpSessionAttributeListener<\/li>\n<\/ul>\n
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