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...
// 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...
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...
Looking at all the three ways to achieve thread-safety, I think the third one is the best option. In that case, the modified class will look like this: The local variableresultseems unnecessary. But, it’s there to improve the performance of our code. In cases where the instance is alr...
1) Static class provides better performance than Singleton pattern, because static methods are bonded on compile time. 2) One more difference between Singleton and static is, ability to override. Sincestatic methods in Java cannot be overridden, they leads to inflexibility. On the other hand, you...
using DesignPatternDemo.Operator; namespace DesignPatternDemo { public class OperatorFactory : Factory<OperatorFactory, BaseOperator> { public BaseOperator GetOperator(string operatorName) { return GetItem(operatorName); } } } OperatorFactory 8. Program 控制台程序,分别使用并行库和Task 多线程调用模拟。
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) ...
public static JavaSingleton getInstance() { return INSTANCE; } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. Listing 1. Minimal singleton The class in Listing 1 seems correct, but it has some imperfections because it immediately loads the instance of the class when the ap...
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 ); ...
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: ...