设计模式--中介者模式

1 中介者模式通过定义一个中介的方式解耦两个对象之间互相的调用。
中介抽象类：

public abstract class AbstractAgency {    protected List<AbstractColleague> lstColleague = new ArrayList<AbstractColleague>();    /**     * 消息处理方法     *      * @param messgae     *            消息     * @param colleague     *            发送方     */    protected abstract void sendMessage(AbstractColleague colleague,            String messgae);    /**     * 添加可发送同事     *      * @param colleague     */    protected void addListColleague(AbstractColleague colleague) {        lstColleague.add(colleague);    }}

具体实现类：

public class ConcreteAgency extends AbstractAgency {    /**     * 具体来执行发送请求     *      * @param colleague     *            发送方     * @param messgae     *            消息     */    @Override    protected void sendMessage(AbstractColleague colleague, String message) {        for (AbstractColleague abstractColleague : lstColleague) {            System.out.println(abstractColleague.getClass().getName());            if (abstractColleague != colleague) {                abstractColleague.receiveMessage(message);            }        }    }}

同事抽象类：

public abstract class AbstractColleague {    protected AbstractAgency mediator;    public AbstractColleague(AbstractAgency mediator) {        super();        this.mediator = mediator;    }    /**     * 接收消息     *      * @param message     */    protected abstract void receiveMessage(String message);    /**     * 发送消息     *      * @param message     */    protected abstract void sendMessage(String message);}

实现类：

public class ConcreteColleague01 extends AbstractColleague {    public ConcreteColleague01(AbstractAgency mediator) {        super(mediator);    }    @Override    protected void receiveMessage(String message) {        System.out.println("Colleague01收到消息："+message);    }    @Override    protected void sendMessage(String message) {        //交给中介去发送給指定的人        mediator.sendMessage(this, message);    }}public class ConcreteColleague02 extends AbstractColleague {    public ConcreteColleague02(AbstractAgency mediator) {        super(mediator);    }    /**     * 接收消息     */    public void receiveMessage(String message) {        System.out.println("Colleague02收到消息:" + message);    }    @Override    protected void sendMessage(String message) {        System.out.println("Colleague02发送消息:" + message);        mediator.sendMessage(this, message);    }}

测试：

public class TextMain {    public static void main(String[] args) {        AbstractAgency agency = new ConcreteAgency();        AbstractColleague colleague01 = new ConcreteColleague01(agency);        AbstractColleague colleague02 = new ConcreteColleague02(agency);        // 添加要发送的同事        agency.addListColleague(colleague01);        agency.addListColleague(colleague02);        //发送        colleague01.sendMessage("hello");    }}

常考《大话设计模式》