Introduction to the intermediary mode (mediator pattern) of Java design Patterns _java

The intermediary pattern of the Java design pattern is one of the behavioral patterns. Defines a mediation object to encapsulate the interaction between series objects. Intermediaries do not need to refer explicitly to each other, so that they are loosely coupled and can independently alter their interactions.

As shown in the following illustration:

Examples of intermediary models between producers, consumers and agents:

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");

 }
}

Run Result:

Hello! I am a consumer
I am a producer