= Architectural Pattern =
주어진 상황에서 소프트웨어 아키텍처에서 흔히 발생하는 문제에 대한 일반적으로 재사용 가능한 해법.

https://en.wikipedia.org/wiki/Architectural_pattern

{{tag>Architecture Modeling Design_Pattern Architectural_Pattern}}


= Model-View-Presenter =
Presenter가 중개인이자 데이터 가공 역할. View와 Presenter간의 위임으로 View에서 데이터 처리 요청 및 그에 대한 Callback을 받는다. 또한 Model에 접근할 수 있는건 오직 Presenter.

== Interface ==
<sxh java ; title:Contract>
package api;

public interface BaseMVPContract {
	interface View {}

    interface Presenter<V extends BaseMVPContract.View> {
        void setView(V view);
    }
}
</sxh>

<sxh java ; title:ConcreteContract>
package api.concrete;

import api.BaseMVPContract;

public interface TaskMVPContract {
	interface View extends BaseMVPContract.View {
		void onResponse(String message);
	}

    interface Presenter extends BaseMVPContract.Presenter<TaskMVPContract.View> {
    	void request(String message);
    }
}
</sxh>


== ConcreteView ==
<sxh java ; highlight:[8]>
package view;

import api.concrete.TaskMVPContract;
import presenter.TaskPresenter;

public class TaskView implements TaskMVPContract.View {

	private TaskPresenter presenter;
	
	public TaskView() {
		presenter = new TaskPresenter();
		presenter.setView(this);
	}
	
	public void requestData(String message) {
		presenter.request(message);
	}
	
	@Override
	public void onResponse(String message) {
		System.out.println(message);
	}
}
</sxh>


== ConcretePresenter ==
<sxh java>
package presenter;

import api.concrete.TaskMVPContract;
import api.concrete.TaskMVPContract.View;

public class TaskPresenter implements TaskMVPContract.Presenter {

	private TaskMVPContract.View view;
	
	@Override
	public void setView(View view) {
		this.view = view;
	}

	@Override
	public void request(String message) {
		StringBuilder sb = new StringBuilder();
		sb.append("+++");
		sb.append(message);
		sb.append("+++");
		
		view.onResponse(sb.toString());
	}

}
</sxh>


== Client ==
만약 GUI 환경이라면 사용자 입력에 대한 동작.

<sxh java>
import view.TaskView;

public class Client {
    public static void main(String[] args) {
    	TaskView v = new TaskView();
    	v.requestData("Hello world");
    }
}

/*
+++Hello world+++
*/
</sxh>