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kvist_case's Introduction

WeatherStation

Min tolkning av oppgaven

Det vanligste med dette designmønsteret er å ha et "subject" som gir beskjed til flere observer-objekter når noe inntreffer. For eksempel kunne en YouTube-kanal vært et Subject som varslet alle subscribers (Observers) når en video var lagt ut.

I dette tilfellet ble WeaterStation en observer som lyttet til flere Subjects (AirUnit og WaterUnit).

Måten dette ble løst på var å kalle på addUnit()-metoden i WeatherStation som der igjen kallet på addObserver() til Subject. Slik ble WeaterStation lagt inn som en Observer i Subject.

Deretter kunne både AirUnit og WaterUnit varsle sine observers (som i dette tilfellet var kun WeatherStation) når enten temperaturen eller luftfuktigheten overskred den satte grensen.

Antar at når det står understiger så skal luftfuktigheten være mindre enn 10 selv om skjermbildet av når det skulle være en logg-sjekk tilsier noe annet

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