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guswns3371
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Nov 5, 2022
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| public class WeatherData implements Subject { | ||
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| private final List<Observer> observers; // 여러 옵저버들을 담는 컬랙션 | ||
| private float temperatures; | ||
| private float humidity; | ||
| private float pressure; | ||
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| public WeatherData() { | ||
| observers = new ArrayList<>(); | ||
| } |
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List<Observer> observers에 ConcreteObserver 객체를 담아두어
한번에 update 메소드를 호출한다
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| @Override | ||
| public void notifyObservers() { | ||
| for (final Observer observer : observers) { | ||
| // (push: subject -> observer) subject 클래스에서 observer들에게 데이터를 push 해준다. | ||
| // observer.updateByPush(temperatures, humidity, pressure);' | ||
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| // (pull : observer <- subject) observer들이 각자 subject의 데이터를 pull한다. | ||
| // push보단 pull이 좋다. | ||
| observer.updateByPull(); | ||
| } | ||
| } |
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| @Override | ||
| public void updateByPush(float temp, float humidity, float pressure) { | ||
| this.temperatures = temp; | ||
| this.humidity = humidity; | ||
| this.pressure = pressure; | ||
| display(); | ||
| } | ||
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| @Override | ||
| public void updateByPull() { | ||
| this.temperatures = weatherData.getTemperatures(); | ||
| this.humidity = weatherData.getHumidity(); | ||
| this.pressure = weatherData.getPressure(); | ||
| display(); | ||
| } |
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updateByPush
- subject가 데이터를 파라미터로 observer에게 전달한다
updateByPull
- observer가 필요한 데이터를 getter 메소드를 통해subject로부터 가져온다
- 보통 push보다 pull 방식이 좋다
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| public class ObserverPattern { | ||
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| /** | ||
| * **오늘 날씨 temperatures=80.0, humidity=65.0, pressure=30.4** [CurrentConditionDisplay] 현재 상태 : 온도80.0F, 습도 65.0%, 기압 30.4 [StatisticsDisplay] 일기 예보 통계 : 온도 80.0F, 습도 65.0%, 기압 30.399999618530273 | ||
| * [ForecastDisplay] 일기 예보 : 온도 92.0F, 습도 65.0%, 기압 30.4 | ||
| * <p> | ||
| * <p> | ||
| * **오늘 날씨 temperatures=82.0, humidity=70.0, pressure=29.2** [CurrentConditionDisplay] 현재 상태 : 온도82.0F, 습도 70.0%, 기압 29.2 [StatisticsDisplay] 일기 예보 통계 : 온도 81.0F, 습도 67.5%, 기압 29.800000190734863 | ||
| * [ForecastDisplay] 일기 예보 : 온도 94.299995F, 습도 70.0%, 기압 29.2 | ||
| * <p> | ||
| * <p> | ||
| * **오늘 날씨 temperatures=78.0, humidity=90.0, pressure=22.4** [CurrentConditionDisplay] 현재 상태 : 온도78.0F, 습도 90.0%, 기압 22.4 [StatisticsDisplay] 일기 예보 통계 : 온도 80.0F, 습도 75.0%, 기압 27.333333333333332 | ||
| * [ForecastDisplay] 일기 예보 : 온도 89.7F, 습도 90.0%, 기압 22.4 | ||
| */ | ||
| public static void main(String[] args) { | ||
| final WeatherData weatherData = new WeatherData(); | ||
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| final CurrentConditionDisplay currentConditionDisplay = new CurrentConditionDisplay(weatherData); | ||
| final StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData); | ||
| final ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData); | ||
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| weatherData.setMeasurements(80, 65, 30.4f); | ||
| weatherData.setMeasurements(82, 70, 29.2f); | ||
| weatherData.setMeasurements(78, 90, 22.4f); | ||
| } | ||
| } |
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weatherData.setMeasurements(); -> notify -> observer들이 데이터를 갱신
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| public void setMeasurements(float temperatures, float humidity, float pressure) { | ||
| this.temperatures = temperatures; | ||
| this.humidity = humidity; | ||
| this.pressure = pressure; | ||
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| System.out.println("\n**오늘 날씨 temperatures=" + temperatures + | ||
| ", humidity=" + humidity + | ||
| ", pressure=" + pressure + "**"); | ||
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| notifyObservers(); | ||
| } |
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