设计模式之单例模式

发布一个k8s部署视频：https://edu.youkuaiyun.com/course/detail/26967

课程内容：各种k8s部署方式。包括minikube部署，kubeadm部署，kubeasz部署，rancher部署，k3s部署。包括开发测试环境部署k8s，和生产环境部署k8s。

腾讯课堂连接地址https://ke.qq.com/course/478827?taid=4373109931462251&tuin=ba64518

第二个视频发布  https://edu.youkuaiyun.com/course/detail/27109

腾讯课堂连接地址https://ke.qq.com/course/484107?tuin=ba64518

介绍主要的k8s资源的使用配置和命令。包括configmap，pod，service，replicaset，namespace，deployment，daemonset，ingress，pv，pvc，sc，role，rolebinding，clusterrole，clusterrolebinding，secret，serviceaccount，statefulset，job，cronjob，podDisruptionbudget，podSecurityPolicy,networkPolicy,resourceQuota，limitrange，endpoint，event，conponentstatus，node，apiservice，controllerRevision等。

第三个视频发布：https://edu.youkuaiyun.com/course/detail/27574

详细介绍helm命令，学习helm chart语法，编写helm chart。深入分析各项目源码，学习编写helm插件

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1类图

2c++实现

/*
 * singleton1.cpp
 *
 *  Created on: 2017年2月7日
 *      Author: admin
 单利模式懒汉式,没有考虑多线程
 */
#include <iostream>
#include <string>

using namespace std;

class FoodFactory{
private:
	static FoodFactory* factory;
private:
	FoodFactory(){}
public:
	static FoodFactory* getInstance(){
		if(factory==NULL){
			factory=new FoodFactory;
		}
		return factory;
	}
};
FoodFactory* FoodFactory::factory=NULL;

int main(){
	FoodFactory* factory=FoodFactory::getInstance();
	delete factory;
	return 0;
}

 

/*
 * singleton2.cpp
 *
 *  Created on: 2017年2月7日
 *      Author: admin
 *      饿汉式
 */

#include <iostream>
#include <string>

using namespace std;

class FoodFactory2{
private:
	static FoodFactory2* factory;
private:
	FoodFactory2(){}
public:
	static FoodFactory2* getInstance(){
		return factory;
	}
};
FoodFactory2* FoodFactory2::factory=new FoodFactory2;

int main(){
	FoodFactory2* factory=FoodFactory2::getInstance();
	delete factory;
	return 0;
}