8. Program 控制台程序,分别使用并行库和Task 多线程调用模拟。 using System; using System.Collections.Generic; using System.Threading.Tasks; using DesignPatternDemo.Operator; namespace DesignPatternDemo { internal class Program { private static void Main(string[] args) { Console.WriteLine("Hello World...
publicclassProgram{publicstaticvoidMain(string[]args){LoadBalancer balancer,balancer2,balancer3;balancer=LoadBalancer.GetLoadBalancer();balancer2=LoadBalancer.GetLoadBalancer();balancer3=LoadBalancer.GetLoadBalancer();// 判断负载均衡器是否相同if(balancer==balancer2&&balancer==balancer3&&balancer2==balancer...
using System;using System.Threading;namespace Singleton{ // This Singleton implementation is called "double check lock". It is safe // in multithreaded environment and provides lazy initialization for the // Singleton object. class Singleton { private Singleton() { } private static Singleton _insta...
The last technique of creating a singleton that we'll talk about is theclass holder. It relies on the use of a private inner class, which is responsible for instantiating the single instance of the singleton, as shown in Listing 6. public class JavaSingleton { /* Private constructor */ pr...
缺点:第一次加载时反应不快,由于java内存模型一些原因偶尔会失败,在高并发下有一定的缺陷。 上述代码依然存在不安全性: instance = new LazySingleton()这条语句实际上不是一个原子操作,它大概包括三件事: 给LazySingleton的实例分配内存; 初始化LazySingleton()的构造器; ...
单态模式在Java、C++中很常用,在Cocoa里,也可以实现。 但是, Objective-C的单例模式绝对和你所想象不一样,他的写法和你所见过的所有语言的写法都不一样。 官方建议 由于自己设计单态模式存在一定风险,主要是考虑到可能在多线程情况下会出现的问题,因此苹果官方建议使用以下方式来实现单态模式: ...
internal class Program { private static void Main(string[] args) { Console.WriteLine("Hello World!"); List<string>concreteOperators = GetConcreteOperators(); Parallel.ForEach(concreteOperators, current => { CallOperator(current); }); foreach (string operatorName in concreteOperators) ...
import java.util.HashMap; public class RegSingleton { protected RegSingleton() {} static public RegSingleton getInstance(String name) { if (name == null) { name = "com.javapatterns.singleton.demos.RegSingleton"; } System.out.println("From RegSingleton: requesting for " + name ); ...
// This program illustrates how to write a singleton class (a class that // can have only one instance) in C++. The trick is to make the default // constructor, copy constructor and assignment operator all private. A // static function GetInstance returns the one and o...
In Java it is even not necessary to use this approach to bypass the singleton. It is enough to just use reflection. This is my singleton class: publicclassJerrySingleton{privateStringname;privateJerrySingleton(){name="Jerry";}privatestaticclassSingletonHolder{privatestaticfinalJerrySingletonINSTANCE=ne...