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Facade consilium exemplar, quod forma forma notum est, exemplar fabricae est. Maxime ad interfaces in subsystem unum summus gradus providere consuevit, ita ut facilius subsystem utatur. Prooemium est talis propositio ad latitudo designandi formam:

1. Definitio

Facade exemplar externum interfacem multiplicibus subsystematibus implicatis praebet, has subsystematibus faciliores ad accessum facit. Hic modus unum interfacies habet ad extra mundum, et applicationes externae non indigent cura internis de rebus subsystem, ita multiplicitate applicationis et conservationis melioris valde minuendae.

2. Motivum et propositum

• Reduce complexionem: Per encapsulando multiplicitatem subsystem in FAMILIAE classium, cliens subsystem per simplicem interfacem vocare potest quin penitus cognoscat exsecutionem specificae subsystem.
• Improve otium of use: Facade modum praebet simplex interface ut clientes subsystem facilius uti possint.
• solutam copulationem: Facade genus inducendo, coniunctio inter clientem et subsystem reducitur, ut mutationes intra subsystem clientem non afficiant.

3. Structura et genus schematis

Classis Diagram:

Facade modus maxime includit tres partes sequentes:

• Frons (species partes) : Cliens vocare modos huius munus potest. Facade classes sunt conscii functionum et officiorum subsystematis adiunctorum. In communibus adiunctis, hoc munus delegabit omnes petitiones ab cliente ad subsystem respondente.
• Subsystem (subsystem munus) : Subsystema una vel plura simul esse potest. Quisque subsystem genus non est separatum, sed collectio classium. Quisque subsystem cliens directe dici potest, vel specie partes. Subsystem specie non cognoscit esse.
• Clientem (partes clientis): Usor vocat munus subsystem per speciem ordinis.

4. Commoda et Incommoda

commodum

1. Redigendum systema complexionem: Dum simplicem interfacem pro subsystems praebendo, faciliorem rationem clientibus cognoscendi et utendi facit.
2. Melior ratio flexibilitate: Cum mutationes in subsystem fiunt, solum opus est Facade classis mutare sine codice cliente immutato.
3. Ad propinquos meos cum Demeter Lex: Facade inducendo genus, dependentia inter clientem et subsystem reducitur.

defectus

1. Subsystems addere vel subsystem extendendo mores facile pericula inducere possunt: Quia omnes petitiones per Facade classis transmittantur, si Facade classis rite designata non sit, nova pericula introduci possunt.
2. Non propinquos meos cum aperto-propinquo principio: In quibusdam casibus, si ratio extendere debes, codicem Facade classis mutare debes, qui principium apertum clausit (id est, extensionibus apertum, modificationibus occlusum).

5. Application missionibus

• Facade modus adhiberi potest cum ratio simplicis instrumenti ad extra mundum providere debet.
• Facade forma adhiberi potest cum ratio in multiplicitate subsystematum abscondere debet.
• Cum opus est aedificare multi-strati systematis structuram, Facade obiecto uti potes, sicut ostium ad simpliciorem iacuit quisque accumsan vocat.

6. exsequendam exempla

In systematis theatri domi, Facade modus adhiberi potest ad operationes usoris simpliciorem reddendam. Exempli gratia, utentes tantum opus habent ut unum remote imperium (Facade class) ad projectores, oratores, DVD histriones et alias machinas (subsystems) refrenandas, sine his machinis separatim operandi.

// 投影仪接口  
interface Projector {  
    void on();  
    void off();  
    void focus();  
    void wideScreenMode();  
}  
  
// 投影仪实现类  
class SimpleProjector implements Projector {  
    @Override  
    public void on() {  
        System.out.println("Projector is on");  
    }  
  
    @Override  
    public void off() {  
        System.out.println("Projector is off");  
    }  
  
    @Override  
    public void focus() {  
        System.out.println("Adjusting projector focus");  
    }  
  
    @Override  
    public void wideScreenMode() {  
        System.out.println("Switching to wide screen mode");  
    }  
}  
  
// DVD播放器接口  
interface DVDPlayer {  
    void on();  
    void off();  
    void play();  
    void stop();  
    void pause();  
    void eject();  
    void setTwoChannelAudio();  
    void setSurroundAudio();  
}  
  
// DVD播放器实现类  
class SimpleDVDPlayer implements DVDPlayer {  
    @Override  
    public void on() {  
        System.out.println("DVD Player is on");  
    }  
  
    @Override  
    public void off() {  
        System.out.println("DVD Player is off");  
    }  
  
    @Override  
    public void play() {  
        System.out.println("DVD Player is playing");  
    }  
  
    @Override  
    public void stop() {  
        System.out.println("DVD Player stopped");  
    }  
  
    @Override  
    public void pause() {  
        System.out.println("DVD Player paused");  
    }  
  
    @Override  
    public void eject() {  
        System.out.println("DVD ejected");  
    }  
  
    @Override  
    public void setTwoChannelAudio() {  
        System.out.println("Stereo mode is on");  
    }  
  
    @Override  
    public void setSurroundAudio() {  
        System.out.println("Surround sound mode is on");  
    }  
}  
  
// 音响接口  
interface Amplifier {  
    void on();  
    void off();  
    void setStereoSound();  
    void setSurroundSound();  
    void setVolume(int volume);  
}  
  
// 音响实现类  
class StereoAmplifier implements Amplifier {  
    @Override  
    public void on() {  
        System.out.println("Amplifier is on");  
    }  
  
    @Override  
    public void off() {  
        System.out.println("Amplifier is off");  
    }  
  
    @Override  
    public void setStereoSound() {  
        System.out.println("Stereo mode is on");  
    }  
  
    @Override  
    public void setSurroundSound() {  
        System.out.println("Surround sound mode is on");  
    }  
  
    @Override  
    public void setVolume(int volume) {  
        System.out.println("Setting volume to " + volume);  
    }  
}  
  
// 家庭影院Facade类  
class HomeTheaterFacade {  
    private Projector projector;  
    private DVDPlayer dvdPlayer;  
    private Amplifier amplifier;  
  
    public HomeTheaterFacade(Projector projector, DVDPlayer dvdPlayer, Amplifier amplifier) {  
        this.projector = projector;  
        this.dvdPlayer = dvdPlayer;  
        this.amplifier = amplifier;  
    }  
  
    // 提供一个简单的方法来观看电影  
    public void watchMovie(String movie) {  
        System.out.println("Get ready to watch a movie...");  
  
        projector.on();  
        projector.wideScreenMode();  
  
        amplifier.on();  
        amplifier.setSurroundSound();  
        amplifier.setVolume(5);  
  
        dvdPlayer.on();  
        dvdPlayer.play(movie);  
  
        System.out.println("Enjoy the movie...");  
    }  
  
    // 提供一个简单的方法来结束观看  
    public void endMovie() {  
        System.out.println("Shutting movie theater down...");  
  
        projector.off();  
        amplifier.off();  
        dvdPlayer.stop();  
        dvdPlayer.eject();  
        dvdPlayer.off();
    }
}
        
class Client{
    public static void main(String[] args) { 
        Projector projector = new SimpleProjector();
        DVDPlayer dvdPlayer = new SimpleDVDPlayer();
        Amplifier amplifier = new StereoAmplifier();
        HomeTheaterFacade homeTheaterFacade = new HomeTheaterFacade(projector,dvdPlayer,amplifier);
        homeTheaterFacade.watchMovie("肖申克的救赎");
        homeTheaterFacade.endMovie();
    }
}

In hoc exemplo potes videre latitudo modum, qui est aptissimus ad plures partes utendi ad certas processus congregandas et in multiplicitate clientis vocat.

7. Libri

Facade consilium exemplar est admodum practicum exemplar, quod complexionem systematis minuit et ratio facilitatis usus et flexibilitas melioratur, dum unum interfaces pro subsystematibus praebens. Sed etiam necesse est ut conscius sis defectuum ac periculorum fieri cum hoc exemplari uteris.

Si modus iste tibi utilis sit, memento delectare et colligere.