设计模式记录

工作中我们会用到设计模式来帮助我们更好的写代码，下面就慢慢的记录我使用到的吧

在这里我用链接温湿度传感器为例，使用socket链接的

import java.net.Socket;


public class SingtonSocket {

	private static volatile Socket client = null;
	
	public static Socket getInstance(String ip,Integer port) {
		
		if(client==null) {
			synchronized(SingtonSocket.class) {
				if (client == null) {
					try {
						client = new Socket(ip, port);
					} catch (Exception e) {
					}
				}
			}
		}
		return client;
	}
}

使用：Socket clientSocket = SingtonSocket.getInstance(hardRecord.getIp(), hardRecord.getPort())

之前代码是这样的

现在是这样的了

List strategy = strategyUseService.resolveStrategy(params.getMenuId()+"");
List list = resultDataList(strategy, collect);

第一步定义一个策略接口

import java.util.List;

public interface ExpireStrategy {

	String strategy();
	
	List getExpireData();
}

贴两个策略的实现类

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.ruoyi.system.service.importantService;

@Component
public class importantStrategy implements ExpireStrategy{

	@Autowired
	importantService importantService;
	
	@Override
	public String strategy() {
		return "2015";
	}

	@Override
	public List getExpireData() {
		return importantService.getExpireData();
	}

}

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.ruoyi.system.service.LibraryService;

@Component
public class LibraryStrategy implements ExpireStrategy{

	@Autowired
	LibraryService libraryService;
	
	@Override
	public String strategy() {
		return "2014";
	}

	@Override
	public List getExpireData() {
		return libraryService.getExpireData();
	}

}

重点在这

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;


@Component
public class StrategyUseService implements ApplicationContextAware{
 
  
    private Map strategyMap = new ConcurrentHashMap<>();
 
    public List resolveStrategy(String menuId) {
    	ExpireStrategy expireStrategy = strategyMap.get(menuId);
        if (expireStrategy != null) {
        	return expireStrategy.getExpireData();
        }else {
        	return new ArrayList<>();
        }
    }
 
    //把不同策略放到map
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        Map tmepMap = applicationContext.getBeansOfType(ExpireStrategy.class);
        tmepMap.values().forEach(strategyService -> strategyMap.put(strategyService.strategy(), strategyService));
    }
}

使用

@Autowired
	StrategyUseService strategyUseService;

List strategy = strategyUseService.resolveStrategy(params.getMenuId()+"");
List list = resultDataList(strategy, collect);