Java設(shè)計(jì)模式的中介者模式是行為模式之一。定義一個(gè)中介對(duì)象來(lái)封裝系列對(duì)象之間的交互。中介者使各個(gè)對(duì)象不需要顯式地相互引用，從而使其耦合性松散，并且可以獨(dú)立地改變他們之間的交互。
如下圖所示：
生產(chǎn)者、消費(fèi)者、代理商之間的中介模式實(shí)例：
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public abstract class PersonColleague{ protected Mediator mediator; public Mediator getMediator() { return mediator; } public void setMediator(final Mediator mediator) { this.mediator = mediator; } protected abstract void message(String context);}public class Mediator{ private PersonColleague consumer = null; private ProducerColleague producer = null; public ProducerColleague getProducer() { return producer; } public void setProducer(final ProducerColleague producer) { this.producer = producer; } public PersonColleague getConsumer() { return consumer; } public void setConsumer(final PersonColleague consumer) { this.consumer = consumer; } public Mediator() { } public synchronized void message(final String context) { if (consumer != null) { System.out.println(context); } else if (producer != null) { System.out.println(context); } }}public class ConsumerColleague extends PersonColleague{ public ConsumerColleague(final Mediator mediator) { this.mediator = mediator; } @Override protected void message(final String context) { this.mediator.setConsumer(this); this.mediator.message("hello! i am a consumer"); }}public class ProducerColleague extends PersonColleague{ public ProducerColleague(final Mediator mediator) { this.mediator = mediator; } @Override protected void message(final String context) { this.mediator.setProducer(this); this.mediator.message(context); }}public class Client{ public static void main(final String[] args) { final Mediator mediator = new Mediator(); final PersonColleague person = new ConsumerColleague(mediator); final PersonColleague person1 = new ProducerColleague(mediator); person.message("I am a consumer"); person1.message("I am a producer"); }} |
運(yùn)行結(jié)果：
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hello! i am a consumerI am a producer |
