Assert.notNull(singletonObject,"Singleton object must not be null");synchronized(this.singletonObjects) {// 通过 beanName 获取 Map 中对应的单例 Bean 实例ObjectoldObject=this.singletonObjects.get(beanName);// 如果不为空,则抛出异常,因为单例已经存在,无法再次注册if(oldObject !=null) {thrownewIlle...
三级缓存是一个包装bean的实例的对象,singletonFactory.getObject() 是 ,其实是调用的 getEarlyBeanReference(beanName, mbd, bean) , protectedObject getEarlyBeanReference(String beanName, RootBeanDefinition mbd, Object bean) { Object exposedObject=bean;if(!mbd.isSynthetic() &&hasInstantiationAwareBeanPostPr...
public Object getSingleton(String beanName, ObjectFactory<?> singletonFactory) { Assert.notNull(beanName, "Bean name must not be null"); // 加锁 synchronized (this.singletonObjects) { // 检查 singletonObjects 缓存中是否有 Object singletonObject = this.singletonObjects.get(beanName); if (singlet...
"Bean name must not be null");Assert.notNull(singletonObject,"Singleton object must not be null");synchronized(this.singletonObjects){ObjectoldObject=this.singletonObjects.get(beanName);if(oldObject!=null){thrownewIllegalStateException("Could not register object ["+...
好的，我找到了解决办法：
If the resolver cannot resolve the dependency then it must return null and not throw. This allows resolvers to be used in a Chain of Responsibility pattern such that multiple resolvers can be asked to resolve a dependency until one finally does. GetServices(Type, Object) Attempts to resolve...
If you think about it, you can see why: when you call new, the allocator creates the object in the managed heap of whatever process happens to be the one calling the initialization code, so how can other processes possibly see it? In general, the common language runtime (CLR...
using System; public sealed class Singleton { private static volatile Singleton instance; private static object syncRoot = new Object(); private Singleton() {} public static Singleton Instance { get { if (instance == null) { lock (syncRoot) { if (instance == null) instance = new Singleton...
稳固而知新 SINGLETON,MONOSTATE,NULL OBJECT 项目管理 阅读更多 SINGLETON 一个类在应用程序中只有一个实例,在程序启动的时候被创建,在程序结束时被删除,通常此类作为基础对象,工厂对象或管理对象。形式1public class SingletonA { private static SingletonA instance = null; private SingletonA() { } public ...
. Check is object null - What are the options? .Net 4 FileLoadException permissions problem With windows service .NET code to extract data from an excel sheet and create a text file having a specific format .Net Core 3.0 Console App. Microsoft.Data.SQLClient is not supported .NET Core su...